Academic literature on the topic 'Non-vascular plants'
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Journal articles on the topic "Non-vascular plants"
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RAVEN, J. A. "Long-distance transport in non-vascular plants." Plant, Cell & Environment 26, no. 1 (January 2003): 73–85. http://dx.doi.org/10.1046/j.1365-3040.2003.00920.x.
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Schneider-Poetsch, Hansjörg A. W., Üner Kolukisaoglu, David H. Clapham, Jon Hughes, and Tilman Lamparter. "Non-angiosperm phytochromes and the evolution of vascular plants." Physiologia Plantarum 102, no. 4 (April 1998): 612–22. http://dx.doi.org/10.1034/j.1399-3054.1998.1020417.x.
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Eldridge, David John. "Conservation of non-vascular plants in semi-arid conditions." Danthonia: newsletter of the Australian Network for Plant Conservation 8, no. 1 (June 1999): 1. http://dx.doi.org/10.5962/p.374085.
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Nicol, Lauren, Wojciech J. Nawrocki, and Roberta Croce. "Disentangling the sites of non-photochemical quenching in vascular plants." Nature Plants 5, no. 11 (October 28, 2019): 1177–83. http://dx.doi.org/10.1038/s41477-019-0526-5.
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Sato, Naoki, and Masaki Furuya. "Distribution of diacylglyceryltrimethylhomoserine and phosphatidylcholine in non-vascular green plants." Plant Science 38, no. 2 (March 1985): 81–85. http://dx.doi.org/10.1016/0168-9452(85)90134-7.
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Cameron, Robert. "Red Maple, Acer rubrum, Wetland Composition and Structure in Nova Scotia." Canadian Field-Naturalist 123, no. 3 (July 1, 2009): 221. http://dx.doi.org/10.22621/cfn.v123i3.968.
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Red Maple (Acer rubrum) wetlands occur when Red Maple dominated forest occupies imperfectly drained to saturated soils. Plots were established in 28 Red Maple wetlands in Nova Scotia to document structure and plant composition. Non-metric multidimensional scaling (NMDS) was used to assess vegetation differences by wetland type (floodplain, depression, slope) and geographic region (inland vs. coastal and western vs. eastern shore). Seventy-eight species of vascular plants and 35 species of non-vascular plants were found in plots. Two species of rare vascular plants and four rare Sphagnum species were found in plots or within the wetlands. Sphagnum species richness was very high. Red Maple wetlands are structurally complex, often having five distinct vertical layers. NMDS species composition analyses suggest little difference between wetland types and geographic regions. Given the diversity of vascular and non-vascular plants and the structural complexity of Red Maple wetlands in Nova Scotia, these wetlands make a significant contribution to the biodiversity and heterogeneity of the landscape.
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Hnatowich, Ian G., Eric G. Lamb, and Katherine J. Stewart. "Reintroducing Vascular and Non-Vascular Plants to Disturbed Arctic Sites: Investigating Turfs and Turf Fragments." Ecological Restoration 41, no. 1 (March 2023): 3–15. http://dx.doi.org/10.3368/er.41.1.3.
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Verloove, Filip, and Nicola Ardenghi. "New distributional records of non-native vascular plants in northern Italy." Natural History Sciences 2, no. 1 (June 30, 2015): 5. http://dx.doi.org/10.4081/nhs.2015.219.
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New distributional records of non-native vascular plants are provided for the Italian regions Piemonte, Lombardia and Emilia-Romagna. <em>Panicum</em> <em>barbipulvinatum</em> is reported for the first time from Italy.
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Knoll, A. H., S. W. F. Grant, and J. W. Tsao. "The Early Evolution of Land Plants." Notes for a Short Course: Studies in Geology 15 (1986): 45–63. http://dx.doi.org/10.1017/s0271164800001329.
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Vascular plants are the most conspicuous organisms on Earth, accounting for some 97 % of our planet's standing biomass. The nearly 300,000 extant vascular plant species exhibit tremendous morphological and ecological diversity. Along with the 20,000 or more species of bryophytes, algae, lichens, and cyanobacteria that also live on land, they fuel a complex terrestrial ecosystem containing animals, fungi, protozoans, and bacteria. The richness of terrestrial life has evolved during the last 10 % of Earth history; there is no evidence for non-microbial land plants or animals in rocks older than the mid-Ordovician.
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Rosenstiel, Todd N., and Sarah M. Eppley. "Long-lived sperm in the geothermal bryophyte Pohlia nutans." Biology Letters 5, no. 6 (July 29, 2009): 857–60. http://dx.doi.org/10.1098/rsbl.2009.0380.
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Non-vascular plants rely on sperm to cross the distance between male and female reproductive organs for fertilization and sexual reproduction to occur. The majority of non-vascular plants have separate sexes, and thus, this distance may be a few millimetres to many metres. Because sperm need water for transport, it has been assumed that sperm lifespans are short and that this type of sexual reproduction limits the expansion of non-vascular plants in terrestrial environments. However, little data is available on the lifespan of sperm in non-vascular plants, and none is available for bryophytes, the group thought to have first colonized terrestrial habitats. Here, we documented the lifespan of sperm of Pohlia nutans , collected from a geothermal spring's area, and tested the effects of variation under environmental conditions on this lifespan. Surprisingly, 20 per cent of the sperm were still motile after 100 h, and sperm lifespan was not significantly affected by temperature variation between 22 and 60°C. Lifespan was significantly affected by sperm dilution and temperatures above 75°C. These results suggest the need to reconsider the importance of sperm motility in bryophyte fertilization.
Dissertations / Theses on the topic "Non-vascular plants"
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Kowal, Jill. "Fungal interactions with vascular and non-vascular plants : an investigation of mutualisms and their roles in heathland regeneration." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/42788.
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Mycorrhizal mutualisms between aboveground vascular plant communities, which reward their belowground fungal associates with photosynthates in return for growth-limiting nutrients such as phosphate, are widely recognized as stable long-term interactions which helped plants colonize land. Pezoloma ericae (D.J. Read) Baral, an ascomycete mycorrhiza-forming fungus present amongst plants in the Ericales, such as heathers, also forms associations in several families of non-vascular leafy liverworts. Whether there is a mutually beneficial functional relationship between these leafy liverworts and the fungus growing in their rhizoids was previously unconfirmed. Furthermore, an ecological role of this 'shared' mycobiont and its link between vascular (Ericaceae) and non-vascular (liverworts) plants was also unknown. Thus the main questions asked in this dissertation are: 1) Is there a measurable mutually beneficial relationship between a liverwort and its fungal partner?; and, 2) Can liverworts harbouring the ericoid mycorrhiza P. ericae act as inoculum that facilitates the re-establishment of Ericaceae - and henceforth be proposed as a practical tool in a restoration ecology context. This is the first time British species of leafy liverworts are conclusively identified to harbour the ericoid mycorrhizal fungus Pezoloma ericae using molecular identification. I have demonstrated a mutualism occurring between the leafy liverworts and their fungal symbiont in two independent microcosm growth experiments and confirmatory reciprocal trophic exchanges between phosphorus and carbon and the two organisms. Glasshouse experiments demonstrated P. ericae originating from leafy liverwort rhizoids, can repeatedly colonize Ericaceae plant roots. Under realistic ecological circumstances (further tested at two field sites), liverworts delivered mycorrhizal inoculum and improved the resilience and growth of vascular plants. By providing this novel source of mycorrhizal inoculum, symbiotic non-vascular plants can contribute to the restoration of plant communities dominated by Ericaceous plants. This research leads to broader knowledge about the function of ericoid mycorrhizas in ecosystems with multi-trophic non-vascular-fungi-vascular community interactions, both above and below ground.
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Pohl, Alexandre. "Compréhension du climat de l’Ordovicien à l’aide de la modélisation numérique." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV081.
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L’Ordovicien (485–444 Ma) est une période géologique caractérisée par laconcomitance d’une glaciation majeure et de l’une des 5 plus grandes extinctions de masse del’histoire de la Terre. Cette thèse avait pour objectif d’améliorer la compréhension de l’évolutiondu climat à cette époque à l’aide de la modélisation numérique, ain de fournir une imagecohérente de la glaciation. Nous avons d’abord démontré que la coniguration continentaleordovicienne induit une dynamique océanique particulière, à l’origine d’une instabilité climatiquepermettant un refroidissement brutal du climat global sans variation importante de laconcentration atmosphérique en CO2 (pCO2). Dans un deuxième temps, un modèle innovantcouplé climat-calotte a permis de produire la première simulation de la mise en place de la glaciationsupportée par les données géologiques, sous un scénario cohérent de baisse de la pCO2.Les résultats indiquent que les premières glaces continentales se seraient mises en place dèsl’Ordovicien Moyen (465 Ma), quelque 20 millions d’années plus tôt qu’initialement envisagé.Dans ce scénario, le franchissement de l’instabilité climatique ordovicienne marque la miseen place du maximum glaciaire au cours de l’Ordovicien terminal Hirnantien (445–444 Ma).Des expériences réalisées avec un modèle de végétation primitive montrent que le développementdes plantes non-vasculaires a pu constituer le mécanisme à l’origine de la chute de lapCO2, via une intensiication de l’altération des surfaces continentales. Enin, les interactionsentre climat et biosphère marine ont été envisagées selon 2 axes complémentaires. (i) De nouvellescontraintes ont été fournies pour comprendre la paléobiogéographie des communautésmarines, par la publication de cartes de la circulation océanique de surface modélisée sousdiférentes pCO2 au cours de l’Ordovicien Inférieur, Moyen et Supérieur. (ii) Les relationsentre variations climatiques et état redox de l’océan ont été étudiées avec un modèle d’océanrécent bénéiciant d’un module de biogéochimie marine (MITgcm). Les simulations suggèrentdes anoxies partielles (durant le Katien) ou globales (durant le Silurien inférieur) au cours dela transition Ordovicien–Silurien. Elles démontrent également que l’extinction de l’Ordovicienterminal ne serait pas liée à un évènement d’anoxieThe Ordovician (485–444 Ma) is a geological period characterized by theconcomitance of a major glaciation and one of the “Big Five” mass extinction events thatpunctuated the Earth’s history. This dissertation aimed at developing a better understandingof the climatic evolution at that time through numerical modeling, in order to providea consistent picture of the glaciation. First, it was shown that the Ordovician continentalconiguration leads to a particular ocean dynamics, which induces in turn the development ofa climatic instability that allows global climate to cool suddenly in response to subtle changesin the atmospheric partial pressure of CO2 (pCO2). Secondly, an innovative climate-ice sheetcoupled model produced the irst simulation of the glaciation that is supported by geologicaldata, in the context of a decrease in pCO2. Results show that glacial onset may have occurredas early as the Mid Ordovician (465 Ma), i.e., some 20 million years earlier than thoughtinitially. In this scenario, the climatic instability is reached during the latest Ordovician andaccounts for the onset of the Hirnantian glacial maximum (445–444 Ma). Experiments conductedwith a non-vascular vegetation model reveal that the origination and expansion of theirst land plants signiicantly intensiied continental weathering during the Ordovician andpotentially drove the drop in atmospheric CO2. Finally, the interactions between climate andthe marine biosphere were investigated based on 2 complementary axes. (i) News constraintson the paleobiogeography of marine living communities were brought through the publicationof maps showing the ocean surface circulation modeled at various pCO2 levels during theEarly, Middle and Late Ordovician. (ii) The relationships between climatic variations andthe redox state of the ocean were studied using a recent ocean model with biogeochemical capabilities(MITgcm). The simulations suggest partial and global oceanic anoxic events duringthe Katian and the early Silurian respectively. They also show that anoxia is probably notresponsible for the latest Ordovician mass extinction event
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Pohl, Alexandre. "Compréhension du climat de l’Ordovicien à l’aide de la modélisation numérique." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV081.
Full textAbstract:
L’Ordovicien (485–444 Ma) est une période géologique caractérisée par laconcomitance d’une glaciation majeure et de l’une des 5 plus grandes extinctions de masse del’histoire de la Terre. Cette thèse avait pour objectif d’améliorer la compréhension de l’évolutiondu climat à cette époque à l’aide de la modélisation numérique, ain de fournir une imagecohérente de la glaciation. Nous avons d’abord démontré que la coniguration continentaleordovicienne induit une dynamique océanique particulière, à l’origine d’une instabilité climatiquepermettant un refroidissement brutal du climat global sans variation importante de laconcentration atmosphérique en CO2 (pCO2). Dans un deuxième temps, un modèle innovantcouplé climat-calotte a permis de produire la première simulation de la mise en place de la glaciationsupportée par les données géologiques, sous un scénario cohérent de baisse de la pCO2.Les résultats indiquent que les premières glaces continentales se seraient mises en place dèsl’Ordovicien Moyen (465 Ma), quelque 20 millions d’années plus tôt qu’initialement envisagé.Dans ce scénario, le franchissement de l’instabilité climatique ordovicienne marque la miseen place du maximum glaciaire au cours de l’Ordovicien terminal Hirnantien (445–444 Ma).Des expériences réalisées avec un modèle de végétation primitive montrent que le développementdes plantes non-vasculaires a pu constituer le mécanisme à l’origine de la chute de lapCO2, via une intensiication de l’altération des surfaces continentales. Enin, les interactionsentre climat et biosphère marine ont été envisagées selon 2 axes complémentaires. (i) De nouvellescontraintes ont été fournies pour comprendre la paléobiogéographie des communautésmarines, par la publication de cartes de la circulation océanique de surface modélisée sousdiférentes pCO2 au cours de l’Ordovicien Inférieur, Moyen et Supérieur. (ii) Les relationsentre variations climatiques et état redox de l’océan ont été étudiées avec un modèle d’océanrécent bénéiciant d’un module de biogéochimie marine (MITgcm). Les simulations suggèrentdes anoxies partielles (durant le Katien) ou globales (durant le Silurien inférieur) au cours dela transition Ordovicien–Silurien. Elles démontrent également que l’extinction de l’Ordovicienterminal ne serait pas liée à un évènement d’anoxieThe Ordovician (485–444 Ma) is a geological period characterized by theconcomitance of a major glaciation and one of the “Big Five” mass extinction events thatpunctuated the Earth’s history. This dissertation aimed at developing a better understandingof the climatic evolution at that time through numerical modeling, in order to providea consistent picture of the glaciation. First, it was shown that the Ordovician continentalconiguration leads to a particular ocean dynamics, which induces in turn the development ofa climatic instability that allows global climate to cool suddenly in response to subtle changesin the atmospheric partial pressure of CO2 (pCO2). Secondly, an innovative climate-ice sheetcoupled model produced the irst simulation of the glaciation that is supported by geologicaldata, in the context of a decrease in pCO2. Results show that glacial onset may have occurredas early as the Mid Ordovician (465 Ma), i.e., some 20 million years earlier than thoughtinitially. In this scenario, the climatic instability is reached during the latest Ordovician andaccounts for the onset of the Hirnantian glacial maximum (445–444 Ma). Experiments conductedwith a non-vascular vegetation model reveal that the origination and expansion of theirst land plants signiicantly intensiied continental weathering during the Ordovician andpotentially drove the drop in atmospheric CO2. Finally, the interactions between climate andthe marine biosphere were investigated based on 2 complementary axes. (i) News constraintson the paleobiogeography of marine living communities were brought through the publicationof maps showing the ocean surface circulation modeled at various pCO2 levels during theEarly, Middle and Late Ordovician. (ii) The relationships between climatic variations andthe redox state of the ocean were studied using a recent ocean model with biogeochemical capabilities(MITgcm). The simulations suggest partial and global oceanic anoxic events duringthe Katian and the early Silurian respectively. They also show that anoxia is probably notresponsible for the latest Ordovician mass extinction event
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Affeld, Kathrin. "Spatial complexity and microclimatic responses of epiphyte communities and their invertebrate fauna in the canopy of northern rata (Metrosideros robusta A. Cunn.: Myrtaceae) on the West Coast of the South Island, New Zealand." Diss., Lincoln University, 2008. http://hdl.handle.net/10182/771.
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Rain forest canopies are renowned for their very high biodiversity and the critical role they play in key ecological processes and their influence on global climate. Despite that New Zealand supports one of the most diverse and extensive epiphyte flora of any temperate forest system, few studies have investigated epiphyte communities and their invertebrate fauna along with factors that influence their distribution and composition. This thesis represents the first comprehensive study of entire epiphyte communities and their resident invertebrate fauna in the canopy of New Zealand’s indigenous forests. The aim of this study was to determine spatial patterns of epiphyte and invertebrate species richness, abundance and community composition in relation to abiotic variables, and in particular, the responses of these communities to elevated temperature and rainfall. This study was carried out in coastal lowland podocarp-broadleaved forests at two sites on the West Coast of the South Island of New Zealand. Samples from 120 mat-forming epiphyte assemblages located on inner canopy branches of 40 northern rata (Metrosideros robusta) trees were studied to characterise the component flora and fauna. Additionally, biomass, branch and tree characteristics and community responses to treatments designed to elevate temperature and rainfall to simulate predicted climate change were measured. This investigation revealed astonishing diversity and functional complexity of epiphyte and invertebrate life in this ecosystem. The 30.6 kg (dry weight) of epiphyte material collected contained a total of 567 species, 170 epiphyte and 397 invertebrate (excluding immature specimens and mites) species, including at least 10 species new to science and many undescribed species Epiphyte communities were found to be dominated by non-vascular plants (80 % of the total species richness), particularly liverworts and invertebrate communities were dominated with respect to abundance (~ 80 % of the total individuals) by Acari, Collembola and Hymenoptera (primarily ants) and functionally by scavengers and ants. Epiphyte and invertebrate communities were highly variable with respect to spatial patterning of species richness, abundance and composition across sites, among trees within sites and among branches within trees. Overall, a highly significant proportion, > 75 %, of the variance could be attributed to differences at the branch level, but these differences could not be explained by the environmental factors measured. There were no consistent relationships between the spatial pattern of epiphytes and invertebrates, or between vascular and non-vascular plants. However, there were significant positive correlations between epiphyte biomass and invertebrate species richness (r = 0.472; p < 0.0001) and abundance (r = -0.395; p < 0.0001), as well as non-living epiphyte biomass and scavenger species richness (r = 0.4; p < 0.0001). Microclimatic measurements taken on epiphyte mats were also highly variable with respect to temperature and relative humidity at similar physical locations within the same tree as well as across trees within sites. There was also considerable variation in the intensity and frequency of climatic extremes, although potentially harmful climatic conditions were experienced by all the epiphyte mats for which weather variables were measured. Negative correlations existed between both epiphyte and invertebrate community composition and increased temperatures expressed as cumulative degree days above 5˚C. However, variability was such that there was no direct evidence that increased temperature and rainfall treatments had an effect on invertebrate species richness, abundance or diversity. Northern rata host trees harbour an astonishingly diverse and complex canopy flora and fauna that is characterised by high spatial variability. Such variability highlights that to determine species distribution and community dynamics in canopy habitats in response to disturbance caused either by climate change or invasive species the structure of entire communities at different taxonomic and spatial scales, along with their responses to microclimatic factors, need to be studied. If such complexities are not taken into account, inappropriate interpretation may result in poor decisions concerning the conservation status, vulnerability and subsequent management of such unique ecosystems.
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Mensi, Imène. "Localisation in planta de Xanthomonas albilineans et identification de déterminants moléculaires impliqués dans la colonisation épiphyte de sa plante hôte, la canne à sucre." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20157.
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Xanthomonas albilineans est l'agent causal de l'échaudure des feuilles, une des principales maladies bactériennes de la canne à sucre dont l'impact peut être très important lorsque des variétés sensibles sont infectées au champ. Les mécanismes qui régissent les interactions entre cet agent pathogène et la canne à sucre sont encore très peu connus. Les objectifs de ce travail étaient (i) d'identifier des déterminants moléculaires impliqués dans la survie épiphyte de X. albilineans et (ii) de préciser la localisation de la bactérie dans les tissus de la canne à sucre. Parmi les facteurs étudiés, les polysaccharides de surface et une protéine de la membrane externe (XaOmpA1) de X. albilineans s'avèrent indispensables pour la survie épiphyte de cet agent pathogène. En revanche, la molécule signal diffusible DSF et les métabolites secondaires codés par les gènes NRPS (« Non Ribosomal Peptide Synthetases ») ne sont pas requis pour l'installation de la bactérie en surface des feuilles, au moins en l'absence d'autres microorganismes compétiteurs. Toutefois, la colonisation optimale de la phyllosphère de la canne à sucre nécessite la présence d'un système DSF/RpfGC intact. Dans la deuxième partie de ce travail, nous avons vérifié la localisation in planta de X. albilineans par microscopie confocale, immunocytochimie, et microscopie électronique à transmission. Les observations microscopiques réalisées ont permis de montrer que X. albilineans n'est pas limitée au xylème de la canne à sucre, comme on le considérait jusqu'à présent. Bien au contraire, cette bactérie est capable de quitter le système vasculaire de sa plante hôte et de pénétrer dans d'autres types cellulaires, notamment les cellules du parenchyme non vasculaire. Il s'agit là, à notre connaissance, d'un nouveau mécanisme de colonisation d'une plante par une bactérie phytopathogène qui reste à décrypterXanthomonas albilineans is the causal agent of leaf scald, a lethal disease of sugarcane that can significantly impact infected susceptible varieties in the field. The mechanisms that govern the interactions between this bacterial pathogen and its host plant are not well known. The objectives of this study were (i) to identify molecular factors involved in epiphytic survival of X. albilineans and (ii) to verify the localization of X. albilineans in sugarcane tissues. Among the studied factors, surface polysaccharides and an outer-membrane protein (XaOmpA1) of X. albilineans were crucial for epiphytic survival of this pathogen. Secondary metabolites synthesized by non-ribosomal peptide synthetases and the diffusible signal factor DSF were not critical for survival of X. albilineans on the sugarcane leaf surface, at least in absence of competing microorganisms. However, an intact DSF/RpfGC system was necessary for optimal colonization of the phyllosphere. In the second part of this study, we verified in planta localization of X. albilineans by confocal microscopy, immunochemistry and transmission electron microscopy. Microscopic observations allowed us to show that X. albilineans is not a xylem limited bacterium as it was believed until now. This pathogen is able to invade numerous cellular types including vascular and non-vascular parenchyma cells. To our knowledge, this is a novel invasion strategy of a plant pathogenic bacterium that has not previously been described, and that remains to be deciphered
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Caine, Robert. "Towards the identification and characterisation of toolkit genes responsible for stomatal development and CO2 response in the non-vascular land plant, Physcomitrella patens." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/16240/.
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Stomata are microscopic structures which exist on the surfaces of many land plants that enable the uptake of CO2 and regulation over water release. The fossil evidence suggests that stomata are ancient as they have been observed on early land plants which existed well 400 million years. Whilst much is known about stomata and their development in vascular land plants, relatively little is known in non-vascular land plants. This thesis identifies a core toolbox of stomatal developmental genes in the non-vascular land plant Physcomitrella patens which share orthology with vascular land plants gene equivalents. To ascertain whether P. patens shares the same genetic mechanisms to alter its stomatal development under different CO2 conditions experiments were conducted on mutants of key patterning genes required for stomatal development. It was found that P. patens does not respond using the same genetic equivalents to that of Arabidopsis thaliana. In conclusion, this thesis outlines the molecular mechanisms required to build stomata are very ancient and shared between distant land plant lineages and as such adds more evidence for a monophyletic origin of stomata.
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Maliniemi, T. (Tuija). "Decadal time-scale vegetation changes at high latitudes:responses to climatic and non-climatic drivers." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526220123.
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Abstract Boreal and arctic plant communities are responding to anthropogenic climate change that has been exceptionally rapid during the recent decades. General responses include increased productivity, range expansions and biodiversity changes, all of which affect ecosystem functions. Vegetation dynamics are however controlled by multiple drivers, and the outcomes under the changing climate are not yet fully clear. As high latitude areas often lack long-term monitoring of vegetation, alternative methods are required to observe and understand vegetation changes and dynamics. Recently, resurveying historical vegetation data has become a valuable method of studying vegetation changes over the past few decades. In this thesis, I studied multidecadal (23–60 years) vegetation changes in forest and treeless heath and tundra plant communities along a latitudinal gradient in northern Fennoscandia using both vegetation resurveys and long-term experimental data. In addition to examining climate-driven vegetation changes, I related changes in plant communities to key local drivers of each context including mesotopography, grazing, soil moisture and soil fertility. General trends among the resurveyed treeless heath sites were the pronounced increase of the dwarf shrub Empetrum nigrum ssp. hermaphroditum in snow-protected habitats and the decrease of lichens throughout. Southernmost heath communities showed strong responses to multidriver effects and had shifted towards new community states. The long-term experiment in the tundra confirmed that depending on driver combinations, tundra communities evolve towards divergent alternative states, highlighting the importance of local drivers in modifying tundra vegetation over time. Communities in fertile forest sites experienced greater temporal turnover compared to infertile forest sites, suggesting that the soil fertility level is a key predictor of vegetation changes under climate change. This particularly important finding previously relied mainly on experimental evidence. Despite these generalities, changes in diversity, plant groups and species varied under a rather uniform climatic warming trend and were often habitat- or region-specific. Thus, the results of my thesis highly motivate continued monitoring and resurveying of vegetation under rapid environmental change and also form baseline time-series data for future studiesTiivistelmä Poikkeuksellisen nopea ilmastonmuutos on johtanut viime vuosikymmenten aikana muutoksiin boreaalisissa ja arktisissa kasviyhteisöissä. Muutoksiin lukeutuvat tuottavuuden lisääntyminen, levinneisyysrajojen siirtyminen sekä muutokset biodiversiteetissä, mitkä kaikki muuttavat ekosysteemien toimintaa. Kasvillisuuden dynamiikkaa säätelevät kuitenkin useat paikallistason tekijät, minkä seurauksena ei ole täysin selvää, miten kasvillisuus on eri alueilla ja habitaateissa muuttunut. Koska kasvillisuuden jatkuva monitorointi on harvinaista pohjoisilla alueilla, vanhojen kasvillisuusaineistojen uudelleenkartoituksista on tullut tärkeä menetelmä muutosten havaitsemiseksi. Tutkin väitöskirjassani vuosikymmenten kuluessa tapahtuneita (23–60 vuotta) kasvillisuusmuutoksia Pohjois-Fennoskandian metsissä, puuttomilla kankailla ja tundralla uudelleenkartoitusten ja kokeellisen tutkimuksen avulla, ja kytkin ne ilmastonmuutokseen sekä tärkeimpiin paikallisiin tekijöihin. Yleisiä trendejä uudelleenkartoitetuilla puuttomilla kankailla olivat variksenmarjan (Empetrum nigrum ssp. hermaphroditum) voimakas lisääntyminen lumensuojaisissa habitaateissa sekä jäkälien väheneminen kaikkialla. Yhteisöjen kokonaismuutos oli voimakkainta eteläisillä puuttomilla kankailla, jossa se korreloi yhtä aikaa lisääntyneiden lämpötilojen ja laidunpaineen kanssa. Kokeellinen tutkimus tundralla osoitti, että kasviyhteisöt kehittyvät hyvin erilaisiksi paikallisten tekijöiden voimakkuussuhteista riippuen, jotka voivat joko hidastaa tai nopeuttaa ympäristömuutoksista johtuvia kasvillisuusmuutoksia. Metsien uudelleenkartoitus osoitti yhteisöjen kokonaismuutoksen olevan pitkällä aikavälillä suurempaa tuottavilla maaperillä lehtometsissä verrattuna karumpiin kangasmetsiin. Tutkimuksen mukaan maaperän tuottavuus on avaintekijä, joka ennustaa kasvillisuusmuutosten voimakkuutta ilmastonmuutoksen aikana. Tästä tärkeästä löydöstä oli aiemmin pääasiassa vain kokeellista tutkimustietoa. Yleisistä trendeistä huolimatta, muutokset diversiteetissä, kasviryhmissä ja yksittäisissä lajeissa olivat kuitenkin vaihtelevia ja usein habitaatti- tai aluesidonnaisia. Väitöskirjani tulokset, jotka muodostavat myös aikasarjan tuleville tutkimuksille, osoittavat kasvillisuuden monitoroinnin ja uudelleenkartoitusten olevan ensisijaisen tärkeitä, jotta kasvillisuuden dynamiikkaa voidaan ymmärtää paremmin nopeasti muuttuvissa olosuhteissa
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Szostoková, Kateřina. "Vztah mezi počtem druhů, teplotou, a úživností prostředí pro původní a nepůvodní druhy rostlin." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-345063.
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Latitudinal gradient of diversity is typically being explained by the three main hypotheses: The Resources Limitation Hypothesis, The Speciation Rate Hypothesis and The Niche Conservatism Hypothesis. In my study I tested basic assumptions of these hypotheses using native and non-native vascular plants obtained from the new database GloNAF (Global Naturalized Alien Flora). I tested an effect of precipitation, NPP, temperature and historical velocity (difference in temperature and precipitation between the Last Glacial Maximum and present) on species richness. Given that the distribution of non-native species is among continents irregular (we can divide them into two groups - Australia with Europe and North America and South America with Africa and Asia), I tested the abovementioned relationships at both - global and continental scale. Species richness of native species increased with NPP, precipitation and temperature and decreased with the difference in temperature. The global distribution of non-native plants increased with precipitation and temperature velocity and decreases with temperature and precipitation velocity, although the results varied for particular continents. Unlike other studies the number of non-native species didn't correlate with the number of native plant species. Concurrently...
Books on the topic "Non-vascular plants"
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Sorrie, Bruce A. The vascular and non-vascular flora of Nantucket, Tuckernuck, and Muskeget Islands. Nantucket, Mass: Massachusetts Audubon Society, 1996.
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Program, Washington Natural Heritage, and Washington (State). Dept. of Natural Resources., eds. Endangered, threatened & sensitive vascular plants of Washington: With working lists of rare non-vascular species. 7th ed. Olympia, Wash: Washington State Dept. of Natural Resources, 1997.
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A, Stapleton C., and Parks Canada Atlantic Region, eds. The distribution and potential for invasiveness of some non-native vascular plants in Northern Cape Breton. Halifax, N.S: Parks Canada, Atlantic Region, 1998.
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Guidelines for Selection of Biological SSSIs: Non-vascular Plants. Joint Nature Conservation Committee, 1992.
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Bronson, Vincent. Guide to Plant Athlete for Beginners: Plants Can Be Either Vascular or Non-Vascular. Independently Published, 2021.
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Rayner, M. C. Mycorrhiza - An Account of Non-Pathogenic Infection by Fungi in Vascular Plants and Bryophytes. White Press, 2018.
Find full textBook chapters on the topic "Non-vascular plants"
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Kelcey, John G. "Plants (Non-vascular)." In Provisional Bibliography of Atlases, Floras and Faunas of European Cities: 1600–2014, 85–87. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31120-3_7.
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Owfi, Reza E. "Cryptogamaes—Non-Vascular Plants." In Natural Products and Botanical Medicines of Iran, 219–26. First edition. | Boca Raton : CRC Press, 2020. | Series: Natural products chemistry of global plants: CRC Press, 2020. http://dx.doi.org/10.1201/9781003008996-8.
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Pérez, Gisela Muro, Jaime Sánchez-Salas, Omag Cano-Villegas, Raúl López-García, and Luis Manuel Valenzuela-Nuñez. "Introduction to Plant Taxonomy: Vascular and Non-vascular Plants with Medicinal Use." In Aromatic and Medicinal Plants of Drylands and Deserts, 1–6. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003251255-1.
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Rahmat, Somayeh. "Non-host Plant Species: Definition, Description, and Mechanisms of Interaction with Arbuscular Mycorrhizal Fungi." In Arbuscular Mycorrhizal Fungi and Higher Plants, 19–36. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8220-2_2.
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AbstractAbout 18–29% of vascular plant species, e.g., important crops, are not involved in a symbiotic interaction with arbuscular mycorrhizal fungi (AMF). These species are known as “non-host” plants. However, these plants can be colonized under certain conditions and develop rudimentary AM (RAM) phenotypes, which often results in a decrease in plant growth and an increase in resistance to pathogens and insects. Several “symbiosis toolbox” genes that are present in the genome of host plants are conserved in non-host plants. Moreover, specific non-symbiotic genes can be brought into play for symbiosis in non-host plants. Altogether, the results show that molecular connections with the symbiosis machinery have still remained in non-host plants, which can enhance the prospect of engineering this functional trait for agricultural plants.
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Liénard, David, and Fabien Nogué. "Physcomitrella patens : A Non-Vascular Plant for Recombinant Protein Production." In Recombinant Proteins From Plants, 135–44. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-59745-407-0_8.
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Mallick, N., and L. C. Rai. "Physiological Responses of Non-Vascular Plants to Heavy Metals." In Physiology and Biochemistry of Metal Toxicity and Tolerance in Plants, 111–47. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-2660-3_5.
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Upreti, D. K., and Rajesh Bajpai. "Status, Issues and Challenges of Biodiversity: Lower Plants (Non-vascular)." In Biodiversity in India: Status, Issues and Challenges, 15–24. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9777-7_2.
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Rapson, Gillian L. "At What Scales and in What Vegetation Types Should We Sample Non-vascular Plants?" In Vegetation Structure and Function at Multiple Spatial, Temporal and Conceptual Scales, 389–403. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21452-8_17.
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Fujinami, Rieko. "Analysis of Cell Division Frequency in the Root Apical Meristem of Lycophytes, Non-seed Vascular Plants, Using EdU Labeling." In Plant Stem Cells, 91–99. New York, NY: Springer US, 2019. http://dx.doi.org/10.1007/978-1-0716-0183-9_10.
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Müller, Norbert. "Most Frequently Occurring Vascular Plants and the Role of Non-Native Species in Urban Areas - A Comparison of Selected Cities in the Old and the New Worlds." In Urban Biodiversity and Design, 227–42. Oxford, UK: Wiley-Blackwell, 2010. http://dx.doi.org/10.1002/9781444318654.ch11.
Full textConference papers on the topic "Non-vascular plants"
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Stroock, Abraham D., Nak Won Choi, Tobias D. Wheeler, Valerie Cross, Scott Verbridge, Claudia Fischbach, and Lawrence J. Bonassar. "Microvascular Structure and Function in Vitro." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82124.
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Vascular structure — a network of convective paths — is a ubiquitous element in multicellular, living systems. The key function of vascular structure in animals and plants is mediation of convective mass transfer over macroscopic distances; this transfer allows an organism to monitor and control the chemical state of its tissues. In our laboratory, we are developing methods to embed and operate microfluidic systems within tissue-like materials in order to capture this function for both biological and non-biological applications. I will present two examples to illustrate our efforts: 1) Capillary beds for the culture of mammalian cells in three-dimensions. In this section, I will discuss the development of methods both to fabricate synthetic capillary beds and to grow them directly out of endothelial cells. I will highlight how simple ideas from continuum mechanics and material science have guided our efforts. 2) Synthetic xylem networks that allow for the transpiration of water at large negative pressures. I will point out the unusual thermodynamic and transport phenomena that are involved in the transpiration process in plants. I will then present our perspectives on the design criteria for systems — synthetic and biological — that mediate this process. Finally, I will describe our experiments with “synthetic trees” in which we have reproduced the main features of transpiration. I will conclude with perspectives on applications and generalizations of both these classes of vascularized materials.
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Banaszek, Jarosław, Marzena Leksy, and Oimahmad Rahmonov. "The Role of Spontaneous Succession in Reclamation of Mining Waste Tip in Area of Ruda Slaska City." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.098.
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Coal exploitation has produced a huge amount of mining waste whose considerable part is being piled on the waste dumps. The analysis was carried out in the area of Ruda Slaska city. The waste dumps are located within the city limits. The spontaneous processes of succession can thus help to manage such urban landscapes in compliance with the principles of sustainable development. The majority of such territories are managed and restored. However, some areas avoid reclamation processes and instead undergo the process of spontaneous vegetation or even landscape succession. The aim of the research is first and foremost to characterize the spontaneous succession of vegetation in terms of habitat requirements to which we include light, temperature, humidity, trophic conditions, reaction (pH), granulometric composition and plant life forms. In the second place the aim was to determine the direction of the spontaneous succession of vegetation as well as to demonstrate the usefulness of such types of research while planning the reclamation of the post-mining areas that have been deformed to suit the urban landscape. The result of the analysis showed the occurrence of 108 vascular plants in I and 60 in II waste dump. It was mostly photophilous species that prevailed on both waste dumps. They were mostly native as well as non-native species. Some species like Calamagrosits epigejos, Robinia pseudoacacia, Betula pendula have high biological productivity despite unfavorable conditions. The overgrown dumps shaped the image of the city landscape in a specific way. However, the investigation showed that the number of species on the waste dumps increases with time. The results of the research into the conditions that reign on the dumping grounds provide the basis for projects of reclaiming the post-mining sites, in particular the waste dumps, from raw material extraction, as well as demonstrate the usefulness of the spontaneous succession of plants.
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Emerson, David R., and Robert W. Barber. "Designing Efficient Microvascular Networks Using Conventional Microfabrication Techniques." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18312.
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The ability to fabricate networks of micro-channels that obey the biological properties of bifurcating structures found in nature suggests that it is possible to construct artificial vasculatures or bronchial structures. These devices could aid in the desirable objective of eliminating many forms of animal testing. In addition, the ability to precisely control hydraulic conductance could allow designers to create specific concentration gradients that would allow biologists to correlate the behavior of cells. In 1926, Murray found that there was an optimum branching ratio between the diameters of the parent and daughter vessels at a bifurcation. For biological vascular systems, this is referred to as Murray’s law and its basic principle has been found to be valid in many plant and mammalian organisms. An important consequence arises from this law: when the successive generations consist of regular dichotomies, the tangential shear stress at the wall remains constant throughout the network. This simple concept forms an elegant biomimetic design rule that will allow designers to create complex sections with the desired hydraulic conductance or resistance. The paper presents a theoretical analysis of how biomimetic networks of constant-depth rectangular channels can be fabricated using standard photolithographic techniques. In addition, the design rule developed from Murray’s law is extended to a simple power-law fluid to investigate whether it is feasible to design biomimetic networks for non-Newtonian liquids. Remarkably, Murray’s law is obeyed for power-law fluids in cylindrical pipes. Although highly promising, the extension of the analysis to rectangular or trapezoidal channels requires much further work. Moreover, it is unclear at this stage whether Murray’s law holds for other non-Newtonian models.
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Ghazali, Nurul Aimi, Shigemi Naganawa, Yoshihiro Masuda, Wan Asma Ibrahim, and Noor Fitrah Abu Bakar. "Eco-Friendly Drilling Fluid Deflocculant for Drilling High Temperature Well: A Review." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78149.
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Conventional clay-based drilling fluids often experienced difficulties in controlling the rheological properties, gelation, and filtration due to flocculation of clay at the temperature higher than 121°C. Deflocculant or thinner, one of the drilling fluid additives, serves a significant role in preventing the association of clay particles particularly in high temperature environments such as high-pressure and high-temperature (HPHT) deep-water drilling. Lignosulfonate has been commonly used in the industry as deflocculant for clay-based drilling fluids since the late 1950s as a replacement for Quebracho tannin. Degradation at the elevated temperature limits the usage of anionic polymer and lignosulfonate. In improving the stability of deflocculant at high temperature, lignosulfonate is admixed or reacted with chromium and iron compound to obtain ferro-chrome lignosulfonate whose temperature limit is approximately 190°C. While recent ferro-chrome lignosulfonate contains less chrome than in the past, development of more environmentally friendly and higher thermally stable deflocculant is still needed. In HPHT environment which requires high-density drilling fluid, a higher thermally-stable deflocculant is also valuable for barite sagging that becomes problematic at a temperature higher than 200°C. Several findings in the past development of adhesives show that addition of tannin improves the thermal stability of lignosulfonate. Tannin is a polyphenolic compound that is natural, non-toxic and biodegradable and can be found in various part of a vascular plant other than Quebracho. Lignosulfonate, on the other hand, is a byproduct of the paper pulping process. Tannin and lignosulfonate are cross-linked to obtain tannin–lignosulfonate for use as a high-temperature drilling fluid deflocculant. Tannin and lignin are the most abundant compounds extracted from biomass. The wide availability of tannin and lignosulfonate is an advantage from a manufacturing cost viewpoint. In this paper, an overview of drilling fluids, classification of drilling fluid, high temperature reservoir environment, and mechanisms of dispersion and deflocculation are presented. Further discussion on the potential development of eco-friendly tannin–lignosulfonate based drilling fluid system for the high temperature well development also presented.
Reports on the topic "Non-vascular plants"
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Christopher, David A., and Avihai Danon. Plant Adaptation to Light Stress: Genetic Regulatory Mechanisms. United States Department of Agriculture, May 2004. http://dx.doi.org/10.32747/2004.7586534.bard.
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Original Objectives: 1. Purify and biochemically characterize RB60 orthologs in higher plant chloroplasts; 2. Clone the gene(s) encoding plant RB60 orthologs and determine their structure and expression; 3. Manipulate the expression of RB60; 4. Assay the effects of altered RB60 expression on thylakoid biogenesis and photosynthetic function in plants exposed to different light conditions. In addition, we also examined the gene structure and expression of RB60 orthologs in the non-vascular plant, Physcomitrella patens and cloned the poly(A)-binding protein orthologue (43 kDa RB47-like protein). This protein is believed to a partner that interacts with RB60 to bind to the psbA5' UTR. Thus, to obtain a comprehensive view of RB60 function requires analysis of its biochemical partners such as RB43. Background & Achievements: High levels of sunlight reduce photosynthesis in plants by damaging the photo system II reaction center (PSII) subunits, such as D1 (encoded by the chloroplast tpsbAgene). When the rate of D1 synthesis is less than the rate of photo damage, photo inhibition occurs and plant growth is decreased. Plants use light-activated translation and enhanced psbAmRNA stability to maintain D1 synthesis and replace the photo damaged 01. Despite the importance to photosynthetic capacity, these mechanisms are poorly understood in plants. One intriguing model derived from the algal chloroplast system, Chlamydomonas, implicates the role of three proteins (RB60, RB47, RB38) that bind to the psbAmRNA 5' untranslated leader (5' UTR) in the light to activate translation or enhance mRNA stability. RB60 is the key enzyme, protein D1sulfide isomerase (Pill), that regulates the psbA-RN :Binding proteins (RB's) by way of light-mediated redox potentials generated by the photosystems. However, proteins with these functions have not been described from higher plants. We provided compelling evidence for the existence of RB60, RB47 and RB38 orthologs in the vascular plant, Arabidopsis. Using gel mobility shift, Rnase protection and UV-crosslinking assays, we have shown that a dithiol redox mechanism which resembles a Pill (RB60) activity regulates the interaction of 43- and 30-kDa proteins with a thermolabile stem-loop in the 5' UTR of the psbAmRNA from Arabidopsis. We discovered, in Arabidopsis, the PD1 gene family consists of II members that differ in polypeptide length from 361 to 566 amino acids, presence of signal peptides, KDEL motifs, and the number and positions of thioredoxin domains. PD1's catalyze the reversible formation an disomerization of disulfide bonds necessary for the proper folding, assembly, activity, and secretion of numerous enzymes and structural proteins. PD1's have also evolved novel cellular redox functions, as single enzymes and as subunits of protein complexes in organelles. We provide evidence that at least one Pill is localized to the chloroplast. We have used PDI-specific polyclonal and monoclonal antisera to characterize the PD1 (55 kDa) in the chloroplast that is unevenly distributed between the stroma and pellet (containing membranes, DNA, polysomes, starch), being three-fold more abundant in the pellet phase. PD1-55 levels increase with light intensity and it assembles into a high molecular weight complex of ~230 kDa as determined on native blue gels. In vitro translation of all 11 different Pill's followed by microsomal membrane processing reactions were used to differentiate among PD1's localized in the endoplasmic reticulum or other organelles. These results will provide.1e insights into redox regulatory mechanisms involved in adaptation of the photosynthetic apparatus to light stress. Elucidating the genetic mechanisms and factors regulating chloroplast photosynthetic genes is important for developing strategies to improve photosynthetic efficiency, crop productivity and adaptation to high light environments.
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Boyle, M. Terrestrial vegetation monitoring at Ocmulgee Mounds National Historical Park: 2021 data summary. National Park Service, July 2023. http://dx.doi.org/10.36967/2299748.
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The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. 2021 marks the first year of conducting this monitoring effort at Ocmulgee Mounds National Historical Park (OCMU). Eight vegetation plots were established throughout the park in early May. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Ocmulgee Mounds National Historical Park in 2021. Data were stratified across two dominant broadly defined habitats within the park, Coastal Plain Alluvial Wetlands and Coastal Plain Upland Forests. Noteworthy findings include: 142 vascular plant taxa (species or lower) were observed across eight vegetation plots, including 15 species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Coastal Plain Alluvial Wetlands: Chinese privet (Ligustrum sinense), Chinese tallow (Triadica sebifera), Japanese honeysuckle (Lonicera japonica), eastern poison ivy (Toxicodendron radicans var. radicans), and smallspike false nettle (Boehmeria cylindrica). Coastal Plain Upland Forests: sweetgum (Liquidambar styraciflua), muscadine (Muscadinia rotundifolia var. rotundifolia), winged elm (Ulmus alata), water oak (Quercus nigra), loblolly pine (Pinus taeda), yaupon (Ilex vomitoria), Japanese honeysuckle, American beautyberry (Callicarpa americana), ebony spleenwort (Asplenium platyneuron), and multiple species of woody vines. Eleven non-native species invasive (Category 1 or Category 2) by the Georgia Exotic Pest Plant Council (GA-EPPC 2023) were encountered within the park during this monitoring effort. Three of these species—Chinese privet, Chinese tallow, and Japanese honeysuckle—were among the most frequent and abundant of all species observed within Coastal Plain Alluvial Wetland plots. There were no observations of vascular plant species listed as rare and tracked by the Georgia Department of Natural Resources (GADNR 2023) within these monitoring plots. Sweetgum, red maple (Acer rubrum), swamp tupelo (Nyssa biflora), and Chinese tallow were the most dominant species within the tree stratum of Coastal Plain Alluvial Wetland sites; water oak, loblolly pine, and sweetgum were the most dominant species of Coastal Plain Upland Forests. There were very few observable disturbances to natural and semi-natural vegetation communities documented during this monitoring effort, including very little to no impact of browsing by white-tailed deer, rooting by feral hogs, or presence of diseased or dying trees. The two most pronounced threats to native vegetation on the park are (1) the high prevalence of non-native, invasive plant species (particular within alluvial habitat, and (2) the altered hydrology of the park’s alluvial wetlands from conversion of large berms for vehicle and railroad traffic. Long-term monitoring data will aid in understanding how these threats over time impact the park’s forest communities.
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Granot, David, Richard Amasino, and Avner Silber. Mutual effects of hexose phosphorylation enzymes and phosphorous on plant development. United States Department of Agriculture, January 2006. http://dx.doi.org/10.32747/2006.7587223.bard.
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Research objectives 1) Analyze the combined effects of hexose phosphorylation and P level in tomato and Arabidopsis plants 2) Analyze the combined effects of hexose phosphorylation and P level in pho1 and pho2 Arabidopsis mutants 3) Clone and analyze the PHO2 gene 4) Select Arabidopsis mutants resistant to high and low P 5) Analyze the Arabidopsis mutants and clone the corresponding genes 6) Survey wild tomato species for growth characteristics at various P levels Background to the topic Hexose phosphorylating enzymes, the first enzymes of sugar metabolism, regulate key processes in plants such as photosynthesis, growth, senescence and vascular transport. We have previously discovered that hexose phosphorylating enzymes might regulate these processes as a function of phosphorous (P) concentration, and might accelerate acquisition of P, one of the most limiting nutrients in the soil. These discoveries have opened new avenues to gain fundamental knowledge about the relationship between P, sugar phosphorylation and plant development. Since both hexose phosphorylating enzymes and P levels affect plant development, their interaction is of major importance for agriculture. Due to the acceleration of senescence caused by the combined effects of hexose phosphorylation and P concentration, traits affecting P uptake may have been lost in the course of cultivation in which fertilization with relatively high P (30 mg/L) are commonly used. We therefore intended to survey wild tomato species for high P-acquisition at low P soil levels. Genetic resources with high P-acquisition will serve not only to generate a segregating population to map the trait and clone the gene, but will also provide a means to follow the trait in classical breeding programs. This approach could potentially be applicable for other crops as well. Major conclusions, solutions, achievements Our results confirm the mutual effect of hexose phosphorylating enzymes and P level on plant development. Two major aspects of this mutual effect arose. One is related to P toxicity in which HXK seems to play a major role, and the second is related to the effect of HXK on P concentration in the plant. Using tomato plants we demonstrated that high HXK activity increased leaf P concentration, and induced P toxicity when leaf P concentration increases above a certain high level. These results further support our prediction that the desired trait of high-P acquisition might have been lost in the course of cultivation and might exist in wild species. Indeed, in a survey of wild species we identified tomato species that acquired P and performed better at low P (in the irrigation water) compared to the cultivated Lycopersicon esculentum species. The connection between hexose phosphorylation and P toxicity has also been shown with the P sensitive species VerticordiaplumosaL . in which P toxicity is manifested by accelerated senescence (Silber et al., 2003). In a previous work we uncovered the phenomenon of sugar induced cell death (SICD) in yeast cells. Subsequently we showed that SICD is dependent on the rate of hexose phosphorylation as determined by Arabidopsis thaliana hexokinase. In this study we have shown that hexokinase dependent SICD has many characteristics of programmed cell death (PCD) (Granot et al., 2003). High hexokinase activity accelerates senescence (a PCD process) of tomato plants, which is further enhanced by high P. Hence, hexokinase mediated PCD might be a general phenomena. Botrytis cinerea is a non-specific, necrotrophic pathogen that attacks many plant species, including tomato. Senescing leaves are particularly susceptible to B. cinerea infection and delaying leaf senescence might reduce this susceptibility. It has been suggested that B. cinerea’s mode of action may be based on induction of precocious senescence. Using tomato plants developed in the course of the preceding BARD grant (IS 2894-97) and characterized throughout this research (Swartzberg et al., 2006), we have shown that B. cinerea indeed induces senescence and is inhibited by autoregulated production of cytokinin (Swartzberg et al., submitted). To further determine how hexokinase mediates sugar effects we have analyzed tomato plants that express Arabidopsis HXK1 (AtHXK1) grown at different P levels in the irrigation water. We found that Arabidopsis hexokinase mediates sugar signalling in tomato plants independently of hexose phosphate (Kandel-Kfir et al., submitted). To study which hexokinase is involved in sugar sensing we searched and identified two additional HXK genes in tomato plants (Kandel-Kfir et al., 2006). Tomato plants have two different hexose phosphorylating enzymes; hexokinases (HXKs) that can phosphorylate either glucose or fructose, and fructokinases (FRKs) that specifically phosphorylate fructose. To complete the search for genes encoding hexose phosphorylating enzymes we identified a forth fructokinase gene (FRK) (German et al., 2004). The intracellular localization of the four tomato HXK and four FRK enzymes has been determined using GFP fusion analysis in tobacco protoplasts (Kandel-Kfir et al., 2006; Hilla-Weissler et al., 2006). One of the HXK isozymes and one of the FRK isozymes are located within plastids. The other three HXK isozymes are associated with the mitochondria while the other three FRK isozymes are dispersed in the cytosol. We concluded that HXK and FRK are spatially separated in plant cytoplasm and accordingly might play different metabolic and perhaps signalling roles. We have started to analyze the role of the various HXK and FRK genes in plant development. So far we found that LeFRK2 is required for xylem development (German et al., 2003). Irrigation with different P levels had no effect on the phenotype of LeFRK2 antisense plants. In the course of this research we developed a rapid method for the analysis of zygosity in transgenic plants (German et al., 2003).
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Boyle, M., and Elizabeth Rico. Terrestrial vegetation monitoring at Fort Matanzas National Monument: 2019 data summary. National Park Service, May 2022. http://dx.doi.org/10.36967/nrds-2293409.
Full textAbstract:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the nationwide Inventory and Monitoring Program of the National Park Service (NPS). The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and it is currently conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. 2019 marks the first year of conducting this monitoring effort at four SECN parks, including Fort Matanzas National Monument (FOMA). Nine vegetation plots, located on Anastasia and Rattlesnake Islands, were established at Fort Matanzas National Monument in June. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Fort Matanzas National Monument in 2019. Data were stratified across two dominant broadly defined habitats within the park (Maritime Upland Forests/Shrublands and Maritime Open Uplands). Noteworthy findings include: Eighty-two vascular plant taxa (species or lower) were observed across nine vegetation plots, including eight species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Maritime Upland Forests and Shrublands: saw palmetto (Serenoa repens), yaupon (Ilex vomitoria), southern/eastern red cedar (Juniperus silicicola + virginiana), American beautyberry (Callicarpa americana), and American burnweed (Erectites hieraciifolius). Maritime Open Uplands: sea oats (Uniola paniculata), earleaf greenbriar (Smilax auriculata), and dixie sandmat (Euphorbia bombensis). ne non-native species, Brazilian pepper (Schinus terebinthifolia), categorized as invasive by the Florida Exotic Pest Plant Council (FLEPPC 2019) was encountered in one Maritime Upland Forest and Shrubland plot during this monitoring effort. There were not any rare plants tracked by the Florida Department of Agriculture and Consumer Services (FDACS 2020) found during this monitoring effort. All plants located in these monitoring plots are fairly common throughout Florida, as well as across the Southeast Coast. Three species observed, however, are on the FDACS 2020 list of commercially exploited plants within the state. These include saw palmetto, cinnamon fern (Osmundastrum cinnamomeum), and coontie (Zamia integrifolia var. umbrosa). Southern/eastern red cedar and cabbage palmetto (Sabal palmetto) were the most dominant species within the tree stratum of the Maritime Upland Forest and Shrubland habitat type. Species that dominated the sapling and seedling strata of this type included yaupon and cabbage palmetto. More than 75% of the trees measured in the parks Maritime Upland Forest and Shrubland habitat type were alive and experiencing healthy vigor. Of the 22 trees that were dead, more than 50% of those were southern/eastern red cedar. Most of those individuals that were observed with moderate or severe decline and greater than 50% dieback were southern/eastern red cedars. Although red bay (Persea borbonia) was identified as one of the “principal understory tree” species within Fort Matanzas National Monument’s maritime forests in 2004 (Zomlefer et al. 2004), tree-sized individuals were rarely detected on plots during this monitoring effort. This may be in part due to the detection of laurel wilt disease within St. Johns County in 2006 (USDA 2021). Based on the low detection...
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Boyle, M., and Elizabeth Rico. Terrestrial vegetation monitoring at Cumberland Island National Seashore: 2020 data summary. National Park Service, September 2022. http://dx.doi.org/10.36967/2294287.
Full textAbstract:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the nationwide Inventory and Monitoring Program of the National Park Service (NPS). The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and it is currently conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. 2020 marks the first year of conducting this monitoring effort at Cumberland Island National Seashore (CUIS). Fifty-six vegetation plots were established throughout the park from May through July. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Cumberland Island National Seashore in 2020. Data were stratified across three dominant broadly defined habitats within the park, including Coastal Plain Upland Open Woodlands, Maritime Open Upland Grasslands, and Maritime Upland Forests and Shrublands. Noteworthy findings include: 213 vascular plant taxa (species or lower) were observed across 56 vegetation plots, including 12 species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Coastal Plain Upland Open Woodlands: longleaf + pond pine (Pinus palustris; P. serotina), redbay (Persea borbonia), saw palmetto (Serenoa repens), wax-myrtle (Morella cerifera), deerberry (Vaccinium stamineum), variable panicgrass (Dichanthelium commutatum), and hemlock rosette grass (Dichanthelium portoricense). Maritime Open Upland Grasslands: wax-myrtle, saw greenbrier (Smilax auriculata), sea oats (Uniola paniculata), and other forbs and graminoids. Maritime Upland Forests and Shrublands: live oak (Quercus virginiana), redbay, saw palmetto, muscadine (Muscadinia rotundifolia), and Spanish moss (Tillandsia usneoides) Two non-native species, Chinaberry (Melia azedarach) and bahiagrass (Paspalum notatum), categorized as invasive by the Georgia Exotic Pest Plant Council (GA-EPPC 2018) were encountered in four different Maritime Upland Forest and Shrubland plots during this monitoring effort. Six vascular plant species listed as rare and tracked by the Georgia Department of Natural Resources (GADNR 2022) were observed in these monitoring plots, including the state listed “Rare” Florida swampprivet (Forestiera segregata var. segregata) and sandywoods sedge (Carex dasycarpa) and the “Unusual” green fly orchid (Epidendrum conopseum). Longleaf and pond pine were the most dominant species within the tree stratum of Coastal Plain Upland Open Woodland habitat types; live oak was the most dominant species of Maritime Upland Forest and Shrubland types. Saw palmetto and rusty staggerbush (Lyonia ferruginea) dominated the sapling stratum within Maritime Upland Forest and Shrubland habitat types. Of the 20 tree-sized redbay trees measured during this monitoring effort only three were living and these were observed with severely declining vigor, indicating the prevalence and recent historical impact of laurel wilt disease (LWD) across the island’s maritime forest ecosystems. There was an unexpectedly low abundance of sweet grass (Muhlenbergia sericea) and saltmeadow cordgrass (Spartina patens) within interdune swale plots of Maritime Open Upland habitats on the island, which could be a result of grazing activity by feral horses. Live oak is the dominant tree-sized species across...
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Boyle, Maxwell. Terrestrial vegetation monitoring at Canaveral National Seashore: 2022 data summary. National Park Service, 2024. http://dx.doi.org/10.36967/2303291.
Full textAbstract:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks? natural vegetation. 2022 marked the first year of conducting this monitoring effort at Canaveral National Seashore (CANA). Fourteen vegetation plots were established throughout the park in April. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Canaveral National Seashore in 2022. Data were stratified across two dominant broadly defined habitats within the park, Coastal Plain Upland Open Woodlands and Maritime Upland Forests and Shrublands. Noteworthy findings include: 176 vascular plant taxa were observed across 14 vegetation plots, including seven species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Coastal Plain Upland Open Woodlands: saw palmetto (Serenoa repens), dune greenbrier (Smilax auriculata), Elliott?s milkpea (Galactia elliottii), myrtle oak (Quercus myrtifolia), Chapman oak (Quercus chapmanii), and southern evergreen blueberry (Vaccinium myrsinites). Maritime Upland Forests and Shrublands: live oak (Quercus virginiana), muscadine (Muscadinia rotundifolia var. rotundifolia), saw palmetto, cabbage palmetto (Sabal palmetto), dune greenbrier, and Virginia creeper (Parthenocissus quinquefolia). Four non-native species categorized as invasive by the Florida Invasive Species Council (FISC 2019) were encountered within Maritime Upland Forest and Shrubland plots during this monitoring effort. These included Brazilian peppertree (Schinus terebinthifolia), cogongrass (Imperata cylindrica), common lantana (Lantana strigocamara), and caesarweed (Urena lobata). There were no invasive species observed in Coastal Plain Upland Open Woodland plots. Two species listed as Endangered by the state of Florida (FDACS 2021) were encountered on the park during this monitoring effort and included hand fern (Cheiroglossa palmata) and Atlantic Coast Florida lantana (Lantana depressa var. floridana). Hand fern was observed in 30%of Maritime Upland Forest and Shrubland plots, while lantana was observed in one (10%) of Maritime Upland Forest and Shrubland plots. An additional five vascular species categorized as Commercially Exploited by the state of Florida (FDACS 2021) were also observed in these vegetation plots. Slash pine (Pinus elliottii) or South Florida slash pine (Pinus densa) and sand live oak (Quercus geminata) were the most dominant species within the tree stratum of Coastal Plain Upland Open Woodlands within the park; cabbage palmetto and live oak were the most dominant species of Maritime Upland Forests and Shrublands, although 11 other species large enough to be measured as trees (i.e., more than 1.37 meters (4.5 ft) in height and greater than or equal to 10 centimeters (3.9 in) in diameter at breast height (DBH) were also present within these plots. Based on these baseline findings, the most immediate threat to vegetation resources within Upland Open Woodlands of Canaveral National Seashore is related to exclusion of fire and an altered natural fire regime. These factors have likely led to a reduction of canopy species (pines) across all woody stem strata?tree, sapling, seedling?and an increase in abundance of woody shrub species (e.g., saw palmetto). These characteristics (low canopy species density and high woody shrub abundance) were observed in monitoring plots of this habitat type. The most immediate threat to Maritime Upland Forest and Shrubland habitat within the park is from potential expansion of non-native, invasive plant species, like Brazilian peppertree and cogongrass. All plots are scheduled to be resampled during the summer of 2026.
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Boyle, M. Terrestrial vegetation monitoring at Kennesaw Mountain National Battlefield Park: 2021 data summary. National Park Service, 2023. http://dx.doi.org/10.36967/2301001.
Full textAbstract:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks? natural vegetation. 2021 was the first year of conducting monitoring at Kennesaw Mountain National Battlefield Park (KEMO). Fourteen vegetation plots were established throughout the park from July through August. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult trees (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Kennesaw Mountain National Battlefield Park in 2021. Data were stratified across two dominant broadly defined habitats within the park, Piedmont Upland Forests and Shrublands; and Piedmont Open Uplands and Woodlands. Noteworthy findings include: 184 vascular plant taxa (species or lower) were observed across 14 vegetation plots, including 27 species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Piedmont Open Uplands and Woodlands: wafer-ash (Ptelea trifoliata var. mollis), white fringe-tree (Chionanthus virginicus), winged elm (Ulmus alata), hog plum (Prunus umbellata), Virginia creeper (Parthenocissus quinquefolia), and blackseed speargrass (Piptochaetium avenaceum). Piedmont Upland Forests and Shrublands: loblolly pine (Pinus taeda), tuliptree (Liriodendron tulipifera var. tulipifera), black cherry (Prunus serotina var. serotina), muscadine (Muscadinia rotundifolia var. rotundifolia), Virginia creeper, and cat greenbrier (Smilax glauca). Fourteen non-native species categorized as invasive by the Georgia Exotic Pest Plant Council (GA-EPPC 2023) were encountered within the park during monitoring. Chinese privet (Ligustrum sinense) was the most frequently encountered and abundant invasive plant within the park. Two species of special concern listed for Georgia (GADNR 2023) were observed during monitoring and included green, or Missouri, rock cress (Boechera missouriensis) and Stone Mountain mint (Pycnanthemum curvipes). Northern red oak (Quercus rubra), winged elm, and eastern redcedar (Juniperus virginiana) were the most dominant species within the tree stratum of Piedmont Open Uplands and Woodlands of Kennesaw Mountain National Battlefield Park; loblolly pine, sweetgum (Liquidambar styraciflua) and tuliptree were the most dominant species of Piedmont Upland Forests and Shrublands. Chinese privet was the most abundant species within the seedling stratum of Piedmont Open Upland and Woodland sites. Heavy browsing impacts by white-tailed deer (Odocoileus virginianus) were observed within the upland forests of Kennesaw Mountain National Battlefield Park. Long-term monitoring of vegetation structure and composition within the park can be used to determine forest regeneration patterns as they relate to changes in browsing pressure. Other threats to native vegetation within the park are (1) the high prevalence of non-native, invasive plant species, and (2) fire suppression within oak-hickory and pine-oak xeric and intermediate forests. Long-term monitoring data will aid in understanding how these threats over time impact the park?s forest communities. All plots monitored during this sampling are scheduled to be resampled in 2025.
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Boyle, Maxwell, and Elizabeth Rico. Terrestrial vegetation monitoring at Fort Pulaski National Monument: 2019 data summary. National Park Service, December 2021. http://dx.doi.org/10.36967/nrds-2288716.
Full textAbstract:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the nationwide Inventory and Monitoring Program of the National Park Service (NPS). The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and monitoring is currently conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. 2019 marks the first year of conducting this monitoring effort on four SECN parks, including Fort Pulaski National Monument (FOPU). Twelve vegetation plots were established at Fort Pulaski National Monument in August. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Fort Pulaski National Monument in 2019. Data were stratified across two dominant broadly defined habitats within the park (Maritime Tidal Wetlands and Maritime Upland Forests and Shrublands). Noteworthy findings include: Sixty-six vascular plant taxa were observed across 12 vegetation plots, including six taxa not previously known from the park. Plots were located on both Cockspur and McQueen’s Island. The most frequently encountered species in each broadly defined habitat included: Maritime Tidal Wetlands: smooth cordgrass (Spartina alterniflora), perennial saltmarsh aster(Symphyotrichum enuifolium), and groundsel tree (Baccharis halimifolia) Maritime Upland Forests and Shrublands: yaupon (Ilex vomitoria), southern/eastern red cedar (Juniperus silicicola + virginiana), and cabbage palmetto (Sabal palmetto). Four non-native species identified as invasive by the Georgia Exotic Pest Plant Council (GA-EPPC 2018) were found during this monitoring effort. These species (and their overall frequency of occurrence within all plots) included: Japanese honeysuckle (Lonicera japonica; 17%), bahiagrass (Paspalum notatum; 8%), Vasey’s grass (Paspalum urvillei; 8%), and European common reed (Phragmites australis; 8%). Two rare plants tracked by the Georgia Department of Natural Resources (GADNR 2013) were found during this monitoring effort. These include Florida wild privet (Forestiera segregata) and Bosc’s bluet (Oldenlandia boscii). Southern/eastern red cedar and cabbage palmetto were the most dominant species within the tree stratum of the maritime Upland Forest and Shrubland habitat type. Species that dominated the sapling and seedling strata of this type included yaupon, cabbage palmetto, groundsel tree, and Carolina laurel cherry (Prunus caroliniana). The health status of sugarberry (Celtis laevigata)—a typical canopy species in maritime forests of the South Atlantic Coastal Plain--observed on park plots appeared to be in decline, with most stems experiencing elevated levels of dieback and low vigor. Over the past decade, this species has been experiencing unexplained high rates of dieback and mortality throughout its range in the Southeastern United States; current research is focusing on what may be causing these alarming die-off patterns. Duff and litter made up the majority of downed woody biomass (fuel loads) across FOPU vegetation plots.
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Boyle, M. Terrestrial vegetation monitoring at Chattahoochee River National Recreation Area: 2021 data summary. National Park Service, 2024. http://dx.doi.org/10.36967/2303257.
Full textAbstract:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identi?ed by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks? natural vegetation. 2021 marked the ?rst year of conducting this monitoring e?ort at Chattahoochee River National Recreation Area (CHAT). Thirty vegetation plots were established throughout the park from June through July. Data collected in each plot included species richness across multiple spatial scales, species-speci?c cover and constancy, species-speci?c woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Chattahoochee River National Recreation Area in 2021. Data were strati?ed across two dominant broadly de?ned habitats within the park, including Piedmont Upland Forests and Piedmont Alluvial Wetland Vegetation and three land parcels: North?from Bowman?s Island to Abbotts Bridge, Middle?from Medlock Bridge to Gold Branch, and South?from Sope Creek to Palisades. Noteworthy ?ndings include: 299 vascular plant taxa were observed across 30 vegetation plots, including 29 species not previously documented within the park. The most frequently encountered species in each broadly de?ned habitat included: Piedmont Alluvial Wetland Vegetation: Chinese privet (Ligustrum sinense), sweetgum (Liquidambar styraciflua), eastern poison ivy (Toxicodendron radicans var. radicans), muscadine (Muscadinia rotundifolia var. rotundifolia), and smallspike false nettle (Boehmeria cylindrica). Piedmont Upland Forests: tuliptree (Liriodendron tulipifera var. tulipifera), eastern poison ivy, Virginia creeper (Parthenocissus quinquefolia), cat greenbrier (Smilax glauca), muscadine, mockernut hickory (Carya tomentosa), and black edge sedge (Carex nigromarginta). Sixteen non-native species categorized as invasive by the Georgia Exotic Pest Plant Council (GA-EPPC 2023) were encountered during this monitoring e?ort, including two not previously detected within the park?miniature beefsteak plant (Mosla dianthera) and Chinese holly (Ilex cornuta). Chinese privet and Japanese honeysuckle (Lonicera japonica) were the most frequently encountered and abundant invasive plant within the park. One species of special concern listed for Georgia (GADNR 2024) was observed during this monitoring e?ort?large-fruited sanicle (Sanicula trifoliata). Tuliptree, loblolly pine (Pinus taeda), boxelder (Acer negundo var. negundo), river birch (Betula nigra), and sweetgum were the most dominant species within the tree stratum of Piedmont Alluvial Wetlands of Chattahoochee River National Recreation Area; white oak (Quercus alba), loblolly pine, tuliptree, and mockernut hickory were the most dominant species of Piedmont Upland Forests. Chinese privet was the most abundant species within the sapling and seedling strata of Piedmont Alluvial Wetlands. The mortality rate of green ash (Fraxinus pennsylvanica) within Piedmont Alluvial Wetland plots was high, and it is likely these trees succumbed to impacts from emerald ash borer (Agrilus planipennis). The emerald ash borer is a wood-boring pest of ash (Fraxinus sp.) and is native to Asia. Since its discovery in the U. S. in the early 2000s, the insect has been responsible for the death of tens of millions of ash trees in the eastern and midwestern parts of the country. At this time, it is not certain whether the declining health of ash within Chattahoochee River National Recreation Area is due to emerald ash borer, edaphic factors that are responsible for natural mortality and decline, or other factors. Other threats to native vegetation within the park are: (1) the high prevalence of non-native, invasive plant species; (2) ?re suppression within oak-hickory; and (3) impacts from heavy browse by white-tailed deer (Odocoileus virginianus). All plots monitored during this sampling e?ort are scheduled to be resampled in 2024.
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Barg, Rivka, Erich Grotewold, and Yechiam Salts. Regulation of Tomato Fruit Development by Interacting MYB Proteins. United States Department of Agriculture, January 2012. http://dx.doi.org/10.32747/2012.7592647.bard.
Full textAbstract:
Background to the topic: Early tomato fruit development is executed via extensive cell divisions followed by cell expansion concomitantly with endoreduplication. The signals involved in activating the different modes of growth during fruit development are still inadequately understood. Addressing this developmental process, we identified SlFSM1 as a gene expressed specifically during the cell-division dependent stages of fruit development. SlFSM1 is the founder of a class of small plant specific proteins containing a divergent SANT/MYB domain (Barg et al 2005). Before initiating this project, we found that low ectopic over-expression (OEX) of SlFSM1 leads to a significant decrease in the final size of the cells in mature leaves and fruits, and the outer pericarp is substantially narrower, suggesting a role in determining cell size and shape. We also found the interacting partners of the Arabidopsis homologs of FSM1 (two, belonging to the same family), and cloned their tomato single homolog, which we named SlFSB1 (Fruit SANT/MYB–Binding1). SlFSB1 is a novel plant specific single MYB-like protein, which function was unknown. The present project aimed at elucidating the function and mode of action of these two single MYB proteins in regulating tomato fruit development. The specific objectives were: 1. Functional analysis of SlFSM1 and its interacting protein SlFSB1 in relation to fruit development. 2. Identification of the SlFSM1 and/or SlFSB1 cellular targets. The plan of work included: 1) Detailed phenotypic, histological and cellular analyses of plants ectopically expressing FSM1, and plants either ectopically over-expressing or silenced for FSB1. 2) Extensive SELEX analysis, which did not reveal any specific DNA target of SlFSM1 binding, hence the originally offered ChIP analysis was omitted. 3) Genome-wide transcriptional impact of gain- and loss- of SlFSM1 and SlFSB1 function by Affymetrix microarray analyses. This part is still in progress and therefore results are not reported, 4) Search for additional candidate partners of SlFSB1 revealed SlMYBI to be an alternative partner of FSB1, and 5) Study of the physical basis of the interaction between SlFSM1 and SlFSB1 and between FSB1 and MYBI. Major conclusions, solutions, achievements: We established that FSM1 negatively affects cell expansion, particularly of those cells with the highest potential to expand, such as the ones residing inner to the vascular bundles in the fruit pericarp. On the other hand, FSB1 which is expressed throughout fruit development acts as a positive regulator of cell expansion. It was also established that besides interacting with FSM1, FSB1 interacts also with the transcription factor MYBI, and that the formation of the FSB1-MYBI complex is competed by FSM1, which recognizes in FSB1 the same region as MYBI does. Based on these findings a model was developed explaining the role of this novel network of the three different MYB containing proteins FSM1/FSB1/MYBI in the control of tomato cell expansion, particularly during fruit development. In short, during early stages of fruit development (Phase II), the formation of the FSM1-FSB1 complex serves to restrict the expansion of the cells with the greatest expansion potential, those non-dividing cells residing in the inner mesocarp layers of the pericarp. Alternatively, during growth phase III, after transcription of FSM1 sharply declines, FSB1, possibly through complexing with the transcription factor MYBI serves as a positive regulator of the differential cell expansion which drives fruit enlargement during this phase. Additionally, a novel mechanism was revealed by which competing MYB-MYB interactions could participate in the control of gene expression. Implications, both scientific and agricultural: The demonstrated role of the FSM1/FSB1/MYBI complex in controlling differential cell growth in the developing tomato fruit highlights potential exploitations of these genes for improving fruit quality characteristics. Modulation of expression of these genes or their paralogs in other organs could serve to modify leaf and canopy architecture in various crops.