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Marlowe, Karol. "Biogeography and evolution of flowering plants in the American West : Gaillardia (asteraceae) and Synthyris (plantaginaceae)". Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Spring2007/k_marlowe_043007.pdf.
Pełny tekst źródłaYu, Boying. "Gametogenesis and flower development controlled by AtAnamorsin1 and AtPUB4". HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/158.
Pełny tekst źródłaLee, Alexandra P. "CO2 decline and the rise of the angiosperms". Thesis, University of Nottingham, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716841.
Pełny tekst źródłaReyes, Elisabeth. "Evolutionary history of floral key innovations in angiosperms". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS489/document.
Pełny tekst źródłaAngiosperms are a clade known for its great species diversity and the uneven distribution of this diversity among its lineages. This work focuses on the ancestral state reconstruction of floral characters on phylogenies in the purpose of studying their impact on diversification. We first focused on two potential key innovations in Proteaceae, bilateral perianth symmetry and presence in Mediterranean-climate hotspots. Using character state dependent diversification models, we found that the first character state did not have any significant impact on species diversification in this group, contrary to the second one. We then reconstructed ancestral states for perianth symmetry in angiosperms as a whole, using a sampling strategy aimed at capturing all of the transitions in this character. We found a minimum of 130 origins of bilateral symmetry, followed by 69 subsequent reversals to radial symmetry. Lastly, the same approach was extended to the study of four other perianth characters. Different ancestral state reconstruction models were used on a phylogenetic tree of 1232 species to test the influence of model changes on reconstructed ancestral states. Our results show that changes in reconstruction models have an impact on the inferred ancestral state of some nodes, but not all of them. The various results obtained for symmetry, a character shared among the three chapters, indicate that our sampling method has the drawback of estimating transition rates too high to give conclusive results with maximum likelihood. On the other hand, results are much less biased when several characters are examined simultaneously
Branco, Diana Santos 1983. "Sinalização por carboidratos em cana-de-açucar e divergencia evolutiva". [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317165.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-11T18:43:41Z (GMT). No. of bitstreams: 1 Branco_DianaSantos_M.pdf: 18385613 bytes, checksum: 43238e785391538d38599321de0ac5ca (MD5) Previous issue date: 2008
Resumo:Além de fonte primária de carbono e energia para os principais tipos celulares, os açúcares produzidos pela fotossíntese adquiriram importantes funções ao longo da evolução das plantas, no controle do crescimento e desenvolvimento, do metabolismo e na resistência a estresses abióticos (osmótico, energético) e bióticos (potógenos). Os açúcares atuam como sinalizadores ativando cascatas de transdução e, desta forma, promovendo mudanças na programação da expressão gênica. Com o objetivo de entendermos como a sinalização por açúcares diversificou-se em angiospermas, iniciamos uma análise comparativa dos perfis de expressão gênica em resposta aos açúcares sacarose e glicose em plântulas da monocotiledônea Saccharum spp e da eudicotiledônea Arabidopsis thaliana. Para tanto, duas abordagens foram utilizadas. O primeiro aspecto do trabalho estabeleceu relações entre elementos de resposta rápida (resposta primária) a açúcar e acúmulo de sacarose em genótipos de cana contrastantes para teor de sacarose. Outra abordagem, mais abrangente, procurou identificar genes diferencialmente expressos em resposta à sacarose. Na primeira parte do trabalho, a análises por qRT-PCR revelaram uma clara relação entre genes envolvidos em acúmulo de sacarose em cana-de-açúcar e sinalização primária por carboidratos. A partir de 34 SAS (Sugarcane Assembled Sequence) testados envolvidos em acúmulo de sacarose em cana, 24 deles também foram responsivos à glicose e/ou sacarose, sendo que 9 deles responderam em um mesmo sentido em genótipos de cana-de-açúcar que acumulam maior quantidade de sacarose (alto Brix). Dos 24 SAS responsivos à sacarose e/ou glicose, apenas 6 deles apresentaram genes ortólogos em Arabidopsis thaliana cuja regulação por estes açúcares ocorreu de maneira similar. Dentre eles, temos o fator de transcrição IAA16, que se mostrou reprimido por sacarose e glicose, constituindo um possível gene de interação entre sinalização por açúcares e auxina. Duas SNFs quinases parálogas de cana-de-açúcar tem como ortólogo um único gene de Arabidopsis thaliana. Os três genes foram reprimidos por sacarose e glicose, sendo outra parte conservada, na via de sinalização a açúcares entre as duas espécies. Outro gene de particular interesse corresponde a uma deidrina, reprimida por sacarose e glicose em cana, assim como seu ortólogo em Arabidopsis e genótipos alto Brix, sugerindo importante papel deste gene em processos relacionados a sinalização/acúmulo de sacarose. Na segunda parte do trabalho, utilizando-se a técnica de microarranjos de cDNA a partir do chip SUCAST, encontramos 55 genes diferencialmente expressos em resposta à sacarose. Destes, apenas 3 apresentaram genes ortólogos de Arabidopsis regulados por açúcar num mesmo sentido que em cana, correspondentes a duas proteínas quinases e a um gene pseudo-response-regulator. Este estudo preliminar identificou genes conservados da sinalização por açúcares em angiospermas que representam possíveis nós importantes das redes de controle relacionadas a carboidratos. O estabelecimento de um possível envolvimento de alguns destes genes no controle da capacidade de acumular mais sacarose no colmo da cana, abriu novas perspectivas na análise molecular desta importante característica. Estudos mais abrangentes são necessários para melhorar os conhecimentos sobre o grau de diversificação da sinalização por açúcares em angiospermas e os valores adaptativos associados.
Abstract: Besides act as carbon primary source in the major types of cells, sugars produced by photosynthesis acquired important functions in the course of plant's evolution like controlling growth, development, and metabolism and acting in resistance to abiotic and biotic stresses like osmotic, energetic and response to pathogens. Sugars can be signals that active signal transduction pathways to change genes expression programs. In order to access the diversification of sugar pathway signaling in angiosperms we conduct comparative analysis of the gene expression in response to sucrose and glucose in seedlings of the monocot Saccharum sp. and the eudicot Arabidopsis thaliana. We also aimed to access the possible correlation between genes related to sucrose storage in sugar-cane and genes related to primary sugar responses. Another aim was to identify deferentially expressed genes in sucrose response. A clearly relation between genes related to sucrose storage in sugar-cane and quickly primary response to sugars was obtained by qRT-PCR analysis. We tested 34 SAS (Sugar Assembled Sequence) related to sucrose storage in sugar-cane and we found that 24 of them were responsive to glucose and/or sucrose. Nine genes showed the same expression pattern (induction or repression) in response to sugar as seen in high Brix genotypes. Six, of this 24 genes, have Arabidopsis orthologues regulated in the same direction (induced or repressed). One is an IAA16 transcription factor that is repressed by both, glucose and sucrose, and may play a role in an integrative pathway of sugar and auxin responses. We also find two SNFs kinases (paralogues) related to a single Arabidopsis ortholog showing the repression response. Another interesting gene is a dehydrin that was repressed in response to sucrose and glucose in sugar-cane and Arabidopsis (its ortholog) and in the high Brix sugar-cane genotypes. It suggests an important role for this dehydrin in processes related to sucrose signaling and storage. In the second part of this work, the sugar-cane cDNA microarray chip, called SUCAST, allow us to identify 55 deferentially expressed in response to sucrose. Only three of these genes have orthologues regulated in same way in sugar-cane and Arabidopsis. These genes correspond to two protein-kinase and a pseudo-response regulator. This preliminary approach leads us to identify conserved genes in sugar signaling among angiosperms that possibly represents important nodes in the regulatory networks in response to sugars. Establishing the involvement of some of these genes in the ability of sucrose storage in sugar-cane's culm will lead us to new perspectives in the molecular basis of this characteristic. More specific works are also needed to improve the knowledge about the real degree of evolutive diversification in sugar signaling among angiosperms and associated genetic fitness.
Mestrado
Genetica Vegetal e Melhoramento
Mestre em Genética e Biologia Molecular
Martins, Aline Cristina. "Abelhas coletoras de óleo e suas interações com as flores de Plantaginaceae produtoras de óleo floral". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/59/59131/tde-23042010-154006/.
Pełny tekst źródłaFloral oils are alternative flower reward to pollen and nectar that are offered by eleven families of angiosperms to oil-collecting bees. The production of this resource appeared at least 28 times, and its collection has been observed in five different lineages of bees. In the Neotropical Region, Malpighiaceae is the most diverse and best known family concerning to the pollination system and the interactions with oil-collecting bees. Plantaginaceae is well known due to some studies mostly on Angelonia and Monttea. In this study, the relationship between the oil-collecting bees and the Plantaginaceae flowers (five species of Angelonia and one of Basistemon) is presented, being given special attention to the morphological aspects of both, the bees behavior during the oil collection and the geographical overlap between the partners of this mutualism. This work presents for the first time the visitors of three species (A. eriostachys, A. goyazensis and Basistemon silvaticus), as well as new data on already studied species (A. cornigera, A. integerrima and A. salicariifolia). It was recorded that the specialized structures that are found on the lip (labellum) of all the known species of Angelonia are associated to the imposition of the correct posture of the visitor and their fixation on the flower. The Basistemon flowers are, in this way, less complex and they present only a discrete median callus. Although the morphology of these structures differ considerably among species, it is possible to establish relationships between their origins. The assemblage of visitors of the flowers of Angelonia and Basistemon varied from three to eighteen species. These species were considered pollinators or illegitimate visitors of the studied species. The bees of the genus Centris were considered the main pollinators of these plants; however species of Tapinotaspidini also play this role. These bees collect oil and pollen, in most species, having as exceptions the genera Centris, Caenonomada e Tapinotaspis that collect only oil. The correct behavior of the visitors of Angelonia and Basistemon flowers, imposed by the floral morphology, results the collection of oil with the forelegs and the contact of their fertile organs with their anterior head or dorsal thorax (in flowers with deep corolla). Some species are morphologically adapted to sample in these flowers, for example, the Centris bees group hyptidis, that have collecting apparatus that diverge from the pattern found in the genera. In respect to the distribution of these plants and their potential pollinators, in some cases, there is a large overlap and the potential pollinators may or may not be specialists in these oil sources. The cases of low geographical congruency show that many of these potential pollinators do not depend only on the oil sources of Angelonia and Basistemon.
Behera, Jyoti, i Aruna Kilaru. "Comparative in Silico Analysis of WRINKLED1 Paralogs in Angiosperms". Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etsu-works/7723.
Pełny tekst źródłaBehera, Jyoti, Shina Bhatia i Aruna Kilaru. "Comparative in Silico Analysis of WRINKLED1 Paralogs in Angiosperms". Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etsu-works/7724.
Pełny tekst źródłaFagundes, Paula Braga. "Um lugar ao sol : a influência do fator histórico sobre o nicho de luz e respostas ecofisiológicas de plantas com semente da floresta ombrófila mista". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/90470.
Pełny tekst źródłaIn forest environments, light is the resource that most often limits the growth, survival and reproduction in plants. Thus, the variation in light availability, regarded as one of the most important resources for woody plants in the understory, results in differences in species composition, which segregate in different light niches according to their preferences and tolerances, conferred by their adaptations and phenotypic plasticity. Extant plant traits are not only adapted to the present environment, they are also a legacy from their ancestors and, for that reason, phylogenetically related species often share similar attributes and consequently occupy similar niches, pattern known as phylogenetic conservatism. Recent studies show that functional traits related to the capture of this resource have diversified across different phylogenetic groups, giving them distinct abilities to occupy new light environments. The present study aimed to detect the presence of phylogenetic patterns in species distribution along a light gradient and in ecophysiological responses of eight co-occurring woody species and their respective clades in a forest understory. This was accomplished by comparing the light niche of juvenile plants in response to the existing light gradient, as well as their physiological plasticity in response to understory light variations. We hypothesized that (1) phylogenetic related species have greater similarity of adaptive strategies, and consequently of their niche, than more distantly related ones; and that (2) the niche breadth is wider and (3) traits plasticity is greater in more recent than in more basal clades. The results presented here showed that there is a greater niche similarity between closely related species than between those that are phylogenetically distant, suggesting niche conservatism. Regarding to niche amplitude, there is also a phylogenetic influence but, contrary to our expectations, the older clades showed a greater niche breadth. For plasticity of selected plant traits, results showed no phylogenetic pattern for the studied species and clades, suggesting that other factors act on the phenotypic plasticity of plants, such as ontogenetic effects and/or environmental stress.
Carpenter, Kevin Joseph. "Structure and evolution of the leaf epidermis in basal angiosperms /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
Pełny tekst źródłaWardell, Brian. "Evolution of barren STALK2/LAX PANICLE2 (BA2/LAX2) in angiosperms". Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527423.
Pełny tekst źródłaMuch of plant growth is directly or indirectly regulated by the plant hormone auxin. Although some genes involved in the auxin pathway have been characterized, there are still gaps in our knowledge of this genetic pathway. Recently, the orthologous maize genes BARREN STALK2 ( BA2) and rice gene LAX PANICLE2 (LAX2) have been cloned and characterized. Maize ba2 and rice lax2 mutant plants both show significant flaws in axillary meristem (AM) initiation, suggesting a role in auxin regulation. In support of this hypothesis, LAX2 interacts with the auxin regulating LAX PANICLE1 (LAX1) protein. My research reconstructs the evolutionary history of the BA2/LAX2 lineage and tests for conservation of BA2/LAX2 mRNA expression in diverse grasses. My results indicate that the BA2/LAX2 gene family—comprising BA2 /LAX2, BA2/LAX2-Like1 (BA2/LAX2L1), and BA2/ LAX2-Like2 (BA2/LAX2L2)—is restricted to monocots, and shows evidence of two independent gene duplication events. During its evolution, the BA2/LAX2 gene family appears to have gained a PDZ Protein Binding motif, which may allow it to interact with other proteins besides BA1/ LAX1. My expression analyses show that BA2/ LAX2 genes are expressed during multiple stages of inflorescence development, and this expression is conserved across multiple grass species. A unique floral expression pattern appears to have evolved at the base of the Joinvilleaceae lineage. My study further supports the hypothesis that BA2/LAX2 genes are functioning in multiple AM pathways.
Renny-Byfield, Simon. "Evolution of repetitive DNA in angiosperms : examples from Nicotiana allopolyploids". Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/3358.
Pełny tekst źródłabehera, Jyoti Ranjan, Shina Bhatia i Aruna Kilaru. "Comparative in silico analysis of WRINKLED 1 paralogs in angiosperms". Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/10.
Pełny tekst źródłaTrueba-Sanchez, Santiago. "Ecology, forms and functions of the basal angiosperms from New Caledonia". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT179/document.
Pełny tekst źródłaNew Caledonia (NC) is one of the main biodiversity hotspots (Myers 1988), this is because of its remarkable plant diversity, its endemism rates, among the highest in the world (79%), and because of the vulnerability of its flora. One of the main originalities of New Caledonia flora is based on the presence of a large number of taxa recognized, due to their phylogenetical positions, as the most ancient extant representatives of angiosperms. For a long time, New Caledonia has been considered as an early upset fragment of the Gondwana (Pelletier 2006) that suffered an interrupted history of isolation which conferred the evolutionary particularities that we observe today. However, recent evidences show that NC has derived from the Australian land during the late Mesozoic (~80 Mya), the island was then submerged during the first half of the Cenozoic (Pelletier 2006) and a reemergence of the island seems to have occurred ~37 Mya (Cluzel et al. 1998). After the reappearance of the island above the sea level, several events of recolonisation occurred and they wrought the biodiversity that we observe nowadays (Pillon 2012). NC presents humid forests which are unique relics; under the influence of climate changes, these forests have virtually disappeared from other regions of the globe (Morat et al. 1986). The lineages of “relictual” angiosperms, mainly subservient to these humid forests, have a great scientific and patrimony value, as they can be considered as genuine windows on the past. These taxa are susceptible to contain primitive characters which have either disappeared in most of the existing flowering plants, or that are still shared by a narrow number of them. The identification and the study of these characters are therefore determinants for the comprehension of angiosperms evolution. Some ecological features of these panchronic species, may have either contributed to the huge radiation of extant angiosperms, or they may have contributed to the ecological settling of angiosperms within the Mesozoic flora, providing them with a developmental repertoire for the subsequent explosion of their diversity. This PhD project aims to study the ecological, anatomical and functional diversity of basal angiosperms and it seeks to analyze the evolutionary patterns of these structural and functional features. We will consider here as “basal” angiosperms a great group of flowering plants that has diverged before the monocot and eudicot node. This group is conformed by the ANITA grade, formed by Amborella (a single species endemic to NC), Nymphaeales (waterlilies and other herbaceous aquatic plants) and Austrobaileyales (aromatic woody plants). The Magnoliid subclass, a clade of flowering of early divergence, which contains plants considered as paleodicots by Cronquist (1988), will be also included in the analysis of the « basal » taxa. More recently, the Magnoliids have been redefined as a clade comprising Chloranthales, Canellales, Laurales, Magnoliales, et Piperales (APG III, 2009). In a second part of the project, a fieldtrip to Mexico will be held in order to include speces belonging to the Chloranthaceae and Schisandraceae, as well as Cabombaceae et Nymphaeaceae, by this means, we will incorporate species belonging to all the orders of the “basal” angiosperms, reinforcing the comparative analysis. This research work will lean on the recent publications of the phylogenetic relations within basal angiosperms
Bauer, Matthew J. "The interploidy hybridization barrier in Zea Mays L". Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4448.
Pełny tekst źródłaThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on July 31, 2007) Includes bibliographical references.
Huang, Bing-Quan. "Isolation and characterization of embryo sacs and their component cells in a synergidless (Plumbago) and a synergid-bearing (Nicotiana) angiosperm /". Full-text version available from OU Domain via ProQuest Digital Dissertations, 1991.
Znajdź pełny tekst źródłaBres, Julia. "Modéliser l’évolution des plantes à fleurs au Crétacé et leurs rétroactions avec le climat". Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASJ001.
Pełny tekst źródłaDuring the Cretaceous period, the leaf evolution of flowering plants, or angiosperms, towards higher vein and stomata densities, suggests an unprecedented increase in stomatal conductance as well as evapotranspiration fluxes. However, these paleo-traits are not accounted for in vegetation models whose the aim is to evaluate the effects of evapotranspiration fluxes on the climate system. The purpose of this study is to simulate the stomatal conductance evolution of flowering plants through the Cretaceous period and assess their effects on interaction and feedback between climate and vegetation. By combining fossil data and empirical ecophysiological models, I develop an innovative parameterization of proto-angiosperm vegetation in the ORCHIDEE vegetation model which considers a reduction of both hydraulic and photosynthetic capacities. Thanks to the coupled atmosphere-vegetation model LMDZOR, I demonstrate that the radiation of flowering plants drives a strengthening of the hydrologic cycle and a decrease in surface temperature, the intensities of which are modulated by the atmospheric concentration of CO2. By activating the dynamic vegetation model, I show that flowering plant radiation triggers positive feedback loops in a context of decreasing atmospheric concentration of CO2 during the Cretaceous period: the increase in hydraulic and photosynthetic capacities of flowering plants constitutes a selective advantage compared to other types of plants by allowing them to (i) sustain their productivity, (ii) develop tropical forests and replace conifers in temperate and boreal forests and (iii) enhance precipitations, thus preventing water stress effects on their own development
Child, Robert Joseph. "The evolution of BARREN INFLORESCENCE1 and related AUX/IAA genes in angiosperms". Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527538.
Pełny tekst źródłaThe plant hormone auxin plays a major role in shaping plant morphology and development, but the gene networks regulating its synthesis and transport are incompletely known. The maize BARREN INFLORESCENCE 1 (BIF1) gene has recently been cloned and shown to play an important role in the early stages of polar auxin transport. Auxin is synthesized in shoot tips and transported basipetally through the plant shoot and acts as a morphogen by facilitating the degradation of transcriptional repressors in a concentration dependent manner. The AUX/IAA gene family encodes transcriptional repressors that regulate a subset of plant developmental responses governed by the transcription of early auxin inducible genes in plants. Although the maize BIF1 gene is a member of the AUX/IAA gene family, the co-ortholog(s) of BIF1 in Arabidopsis thaliana was not known prior to this research.
Bayesian phylogenetic reconstruction placed maize BIF1 in a clade sister to Arabidopsis thaliana AtIAA15. The BIF1 lineage has undergone two gene duplications since the divergence of the early grasses. Molecular evolutionary analyses by maximum likelihood suggest that the BIF1 alignment is under strong purifying selection with positive selection acting on a glutamine residue located in a functional region associated with AUX/IAA protein dimerization in one clade of BIF1 paralogs, the BIF1-Like2 (BIF1L2) clade. A character reconstruction analysis using maximum parsimony estimated an adenine to cytosine transversion at the base of the BIF1L2 clade changed a glutamine into an alanine residue in this functional region. Expression of BIF1 orthologs is conserved in floral meristems in the eudicot AtIAA15 clade containing the taxa Erianthe Guttata, Arabidopsis thaliana, Medicago truncatula, however grass BIF1L2 expression has diverged within the PACMAD – BEP clade, specifically in rice, where BIF1L2 expression is reported to have moved into root tissue. These results suggest that BIF1 paralogs has changed following a second round of gene duplication in the grasses. Taken together, a change in localized expression in these sequences, and positive selection acting on a glutamine-rich region of the protein-protein binding motif could imply that BARREN INFLORESCENCE1-like2 proteins are probably interacting with a new set or subset of AUXIN RESPONSE FACTOR (ARF) binding partners, and that neofunctionalization has occurred in the BARREN INFLORESCENCE1-like2 clade.
Quested, Helen M. "Root hemiparasitic angiosperms in subarctic ecosystems : their potential role in ecosystem function". Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246953.
Pełny tekst źródłaBarba-Montoya, J. A. "Bayesian molecular clock dating and the divergence times of angiosperms and primates". Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1565539/.
Pełny tekst źródłaLa-aw, Ampornpan Armstrong Joseph E. "Ontogeny of zygomorphic flowers in the Solanaceae". Normal, Ill. Illinois State University, 1992. http://wwwlib.umi.com/cr/ilstu/fullcit?p9311282.
Pełny tekst źródłaTitle from title page screen, viewed January 31, 2006. Dissertation Committee: Joseph E. Armstrong (chair), Mathew M. Nadakavukaren, Tsan Iuan Chuang, Roger C. Anderson, Jerome R. Cain. Includes bibliographical references (leaves 94-101) and abstract. Also available in print.
Ingram, Gwyneth. "The role of the fimbriata gene cluster in plant development". Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317998.
Pełny tekst źródłaLoehne, Cornelia. "Molecular phylogenetics and historical biogeography of basal angiosperms a case study in Nymphaeales /". [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983926468.
Pełny tekst źródłaThomas, Paul William. "Long-distance systemic irradiance signalling : the extent, nature and mechanism in vascular angiosperms". Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421164.
Pełny tekst źródłaCrawley, Sunny Sheliese. "Rethinking phylogenetics using Caryophyllales (angiosperms), matK gene and trnK intron as experimental platform". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77276.
Pełny tekst źródłaPh. D.
Osborn, Jeffrey Mark. "Comparative ultrastructure of fossil gymnosperm pollen and implications regarding the origin of angiosperms /". The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487757723994964.
Pełny tekst źródłaRuszala, Elizabeth Mary. "Conservation aspects of stomatal function and development between the lycophyte selaginella and model angiosperms". Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546219.
Pełny tekst źródłaBurger, Matthias [Verfasser]. "Functional in vivo analysis of RNA editing factors in bryophytes and angiosperms / Matthias Burger". Ulm : Universität Ulm, 2021. http://d-nb.info/1227450745/34.
Pełny tekst źródłaOh, Il-Chan. "Comparative Seed Morphology and Phylogenetics : Case Studies in Basal Angiosperms (ANITA) and Asterids (Lysimachia, Ericales)". Doctoral thesis, Uppsala universitet, Systematisk biologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-100372.
Pełny tekst źródłaYagi, Eiki. "The distribution of the Au SINE family in angiosperms and gymnosperms and its evolutionary history". Kyoto University, 2012. http://hdl.handle.net/2433/157684.
Pełny tekst źródła0048
新制・課程博士
博士(農学)
甲第16893号
農博第1909号
新制||農||996(附属図書館)
学位論文||H24||N4654(農学部図書室)
29568
京都大学大学院農学研究科応用生物科学専攻
(主査)准教授 河原 太八, 教授 遠藤 隆, 教授 奥野 哲郎
学位規則第4条第1項該当
Guignard, Maite Stephanie. "Ecological consequences of angiosperm genome size and macronutrient availability". Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24632.
Pełny tekst źródłaMahfoud, Hafez M. "Evolution of the genus Aristolochia (Aristolochiaceae) in the Eastern Mediterranean including the Near East and Caucasia". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-27142.
Pełny tekst źródłaOntoria, Gómez Yaiza. "Seagrass responses to climate change: effects of warming and the interaction with local stressors = Respuestas de las angiospermas marinas al cambio climático: efectos del calentamiento y la interacción con estresores locales". Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/669000.
Pełny tekst źródłaDay, Robert Charles, i n/a. "Transcript analysis of proliferative endosperm from Arabidopsis thaliana". University of Otago. Department of Biochemistry, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080703.113233.
Pełny tekst źródłaCameron, Duncan Drummond. "A role for differential host resistance to the hemiparasitic angiosperm, Rhinanthus minor L. in determining the structure of host plant communities?" Thesis, University of Aberdeen, 2004. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=238495.
Pełny tekst źródłaSavard, Joël. "On the evolutionary origin of angiosperms : characterization of MADS-box floral homeotic gene homologues in Ephedra andina (Gnetales)". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0034/MQ64446.pdf.
Pełny tekst źródłaFaiyue, Bualuang. "Bypass flow and sodium transport in rice (Oryza sativa L.)". Thesis, University of Sussex, 2011. http://sro.sussex.ac.uk/id/eprint/6309/.
Pełny tekst źródłaLi, Huan [Verfasser], i Dario [Akademischer Betreuer] Leister. "Large scale plastomics approaches for the study of evolution and adaptive signatures in angiosperms / Huan Li ; Betreuer: Dario Leister". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2017. http://d-nb.info/1172634343/34.
Pełny tekst źródłaSmith, Michaela Madeleine 1972. "Maintenance of ultrastructural integrity during dehydration in a desiccation tolerant angiosperm as revealed by improved preservation techniques". Monash University, Dept. of Biological Sciences, 2002. http://arrow.monash.edu.au/hdl/1959.1/8323.
Pełny tekst źródłaMartínez, Harms Jaime [Verfasser]. "Color vision of insect pollinators : photoreceptor properties, behavioral bases and its implications for the evolution of angiosperms / Jaime Martínez Harms". Berlin : Freie Universität Berlin, 2012. http://d-nb.info/1030382972/34.
Pełny tekst źródłaCrifo, Camilla. "VARIATIONS IN ANGIOSPERM LEAF VEIN DENSITY HAVE IMPLICATIONS FOR INTERPRETING LIFE FORM IN THE FOSSIL RECORD". Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1375987428.
Pełny tekst źródłaSheth, Mili. "Discovery and characterization of KNOX proteins lacking a homeodomain, produced by alternative splicing of KNAT1-like genes in gymnosperms and angiosperms". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/31639.
Pełny tekst źródłaKidd, A. D. "Studies on DNA replication and the cell cycle in the root meristem of fifteen monocotyledonous angiosperms of heterogeneous DNA C values". Thesis, Bucks New University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376419.
Pełny tekst źródłaDahlgren, Linnea. "Bumblebees in a region of northwestern Scania: Is species number correlated to the number of flowering angiosperms and does gene flow occur between four locations?" Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-24564.
Pełny tekst źródłaSperlich, Dominik. "Mediterranean forests in a changing environment - Impacts of drought and temperature stress on tree physiology". Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/327595.
Pełny tekst źródłaEl cambio climático aumentará la sequía en la Cuenca Mediterránea y posiblemente afectará a la abundancia y la distribución de especies. Revisamos las respuestas contrastadas del crecimiento a la temperatura de angio- y gimnospermas en la Península Ibérica. Estudiamos la variación de los efectos del estrés térmico y por sequía en rasgos morfológicos, fotosintéticos y de la respiración foliar según la especie y la posición en el dosel. Además, evaluamos el efecto de una sequía crónica sobre la respiración foliar y la fotosíntesis de Quercus ilex L. La maquinaria fotosintética se mostró resiliente frente a la sequía moderada, mientras que la sequía extrema, agravada por las bajas reservas de agua en el suelo, indujo la aclimatación de la morfología foliar, la inhibición de la bioquímica fotosintética y la abscisión foliar. El sistema fotosintético se aclimató mejor a las temperaturas bajas que al estrés por calor. Las temperaturas suaves en invierno derivaron en la recuperación bioquímica, un nuevo crecimiento de los brotes y una transpiración moderada. La elevada radiación y el frío repentino mostraron un efecto combinado negativo, causando estrés fotoinhibitorio. El estrés térmico y por sequía fue más pronunciado en hojas de sol y aminorado en hojas de sombra. Q.ilex y, en menor grado, Q. pubescens Wild. mostraron la plasticidad más elevada de los rasgos fotosintéticos, mientras que Pinus halepensis Mill. fue más tolerante, mostrando la respuesta más estable a la temperatura. Arbutus unedo L. fue la especie más vulnerable a la sequía y al estrés fotoinhibitorio. En respuesta a la sequía crónica, Q. ilex incrementó la eficiencia en el uso del carbono y la plasticidad de los atributos fotosintéticos y de respiración foliar, pero no afectó al potencial fotosintético. En resumen, las especies climácicas mediterráneas se aclimatan frente a condiciones más cálidas y secas, pero pueden ser sensibles ante sequías extremas. El funcionamiento durante el invierno es vital para entender la dinámica de los bosques mediterráneos. La posición de las hojas en la copa es indispensable para estimar el balance de carbono del dosel. Angiospermas y gimnospermas presentan estrategias fotosintéticas contrastadas, de evitación y tolerancia del estrés, respectivamente.
Silveira, Carina Lima da. "Características vegetativas e reprodutivas das plantas e fatores abióticos do meio e suas relações com a alocação de biomassa floral e a seleção sexual em angiospermas". [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316105.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: As plantas são organismos sésseis que estão à mercê do estresse ambiental. As flores são estruturas fundamentais na evolução das angiospermas, pois através delas ocorre a reprodução sexuada. Para isto, as flores exibem estratégias que auxiliam a planta a obter melhor sucesso reprodutivo. Animais visitam flores em busca de recursos, no entanto, ao transportar grãos de pólen entre os indivíduos da mesma espécie vegetal, atuam como mediadores no processo de seleção sexual, importante força na evolução florai. Fatores ecológicos que afetam a relação entre plantas e polínizadores podem influenciar a evolução das estratégias reprodutivas das espécies. Fatores abióticos, a distribuição espacial, o tamanho populacional e a história de vida das plantas podem modificar a abundância e a distribuição dos recursos para os polínizadores, alterando padrões de transporte de pólen, fluxo gênico e pressões seletivas responsáveis pela evolução floral. Este trabalho busca compreender a diversidade das estratégias reprodutivas em diferentes formações vegetais tropicais, a modulação por características vegetativas e reprodutivas das plantas e abióticas do meio na alocação de recursos como, também, verificar a existência de consistência biogeográfica dos padrões alométricos em relação as estratégias reprodutivas das plantas. O estudo foi realizado em áreas de vegetação tropical, sendo uma área de Floresta Atlântica, uma área de Cerrado, ambas no estado de São Paulo e uma área de Campo Rupestre, no estado de Minas Gerais, permitindo a comparação da variação da biomassa floral entre as três formações vegetais e entre angiospermas tropicais com particularidades morfológicas relacionadas às áreas de coleta e dados bibliográficos de espécies extra-tropicais. A riqueza de formas vegetais e de ambientes nas regiões tropicais atua na modulação da interação entre plantas e polínizadores, influenciando na variação da biomassa floral e nas características vegetativas e reprodutivas das espécies. As alometrias positivas e a isometria encontradas nas floras tropicais e extra-tropícats em relação ao crescimento da biomassa floral apontam para a presença e desenvolvimento de características sexuais secundarias como importantes ferramentas na permanência e sucesso da reprodução cruzada. Características vegetativas e reprodutivas influenciam na variação interespecífica da biomassa floral e que a função masculina da flor teria forte impacto na evolução das características florais, independentemente da ligação filogenética entre as angiospermas, ressaltando a necessidade de teorias que permitam uma síntese destas relações.
Abstract: Plants are sessile organisms exposed to the effects of environmental stress. The flowers are fundamental structures in the evolution of angiosperms, because through them is sexual reproduction. For this, the flowers exhibit strategies that help the plant to achieve better reproductive success. Animals visit flowers in search of resources, however, to carry pollen between individuals of the same plant species, act as mediators in the process of sexual selection, major force in floral evolution. Ecological factors affecting the relationship between plants atid pollinators may influence the evolution of reproductive strategies of species. Abiotic factors, spatial distribution, population size and life history of plants can modify the abundance and distribution of resources for pollinators by changing patterns of pollen transfer, gene flow and selective pressures responsible for floral evolution. This work seeks to understand the diversity of reproductive strategies in different tropical vegetation types, the modulated vegetative and reproductive features of plants and the abiotic environment in resource allocation as well, check for consistency biogeographical of allometric patterns in reproductive strategies in relation to plants. The study was conducted in areas of tropical vegetation, with an area of Atlantic Rain Forest, an area of Savannah, both in the state of Sao Paulo and an area of Campo Rupestre, in the state of Minas Gerais, allowing the comparison of variation among floral biomass the three vegetation types and between tropical angiosperm morphological peculiarities related to the areas of collection and bibliographic data of extra-tropical species. The richness of plant forms and environments in tropical acts in modulating the interaction between plants and pollinators, influencing the variation of biomass in the floral and vegetative and reproductive characteristics of species. The positive allometry and isometry floras found in tropical and extra-tropical growth over the floral biomass indicate the presence and development of secondary sexual characteristics as important tools in the permanence and success of cross-breeding. Vegetative and reproductive characteristics influence the interspecific variation of floral biomass and that the function of male flowers have a strong impact on the evolution of floral traits, regardless of the phylogenetic connection between the angiosperms, highlighting the need for theories that allow a synthesis of these relationships.
Doutorado
Ecologia
Doutor em Ecologia
Valverde-Barrantes, Oscar Jesus. "A phylogenetic perspective on fine root ecology: assessing the role of root evolution on fine root functional traits and ecological interactions in woody angiosperms". Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1384641579.
Pełny tekst źródłaNohra, Youssef A. "Résines végétales actuelles et fossiles : origine, caractérisation chimique et évolution". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S165.
Pełny tekst źródłaThis work focuses on the chemical characterisation of amber from different outcrops from different localities, and varied ages. Some of these outcrops had never been studied. All the amber samples were analysed with the same analytical techniques. The combination of the data obtained from spectroscopic (IR and 13C NMR) and chromatographic (THM-GC-MS) analysis allows the identification of the botanical origin of the amber and provide some information, for the reconstruction of the palaeoenvironment. Biomarkers for the cheirolepidiaceous resins were proposed based on the chemical characterisation of different amber outcrops dating from the Upper Jurassic (Kimmeridgian) to the Upper Cretaceous (Santonian) from Lebanon, Jordan, Congo, Ecuador and France. The Cheirolepidiaceae familt was exclusively present in the Mesozoic era. Hence, the evolution of the botanical origins of the produced resins during the Mesozoic and Cenozoic eras was discussed. It seems that Araucariaceae and Cheirolepidiaceae were the dominant resin producing trees during the Upper Jurassic and the Lower Cretaceous. While, cupressaceous resiniferous plants were dominant during the Upper Cretaceous. Howerver, resins dating from the Cenozoic era, were produced by a wider variety of plants, as resiniferous families of Angiosperm intensively participated in the resin production, i.e. the Peruvian amber produced by Fabaceae. Conifer resins traces were also detected in the Tertiary, such as the amber from the Araucariaceae found in New Zealand. The obtained data allowed a re-evaluation of the classification of ambers by Py-GC-MS, leading to the discovery of a novel molecule. This molecule of an unknown structure brings a new discrimination factor between the classes Ib and Ic. Finally, the age / maturity relationship is showed to be dependent on the burial and the conservation conditions of the resins. A broad molecular database is established based a large group of amber outcrops from different ages, and having diverse botanical origins. This database could be used as a comparative platform for further work in the future
Debastiani, Vanderlei Julio. "Estrutura filogenética de comunidades de plantas lenhosas em ecótonos vegetacionais". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/69737.
Pełny tekst źródłaThe search for consistent patterns in nature has been a major goal of ecologists. This study aimed to employ phylogenetic analyses to improve the understanding of an ecological process, the expansion of forest expansion over open areas. The use of evolutionary information considers species as not independent units in relation to each other, as they share their evolutionary history. Such hierarchical organization of species is very important to determine the rules governing assembly processes in local communities. Phylogenetic approaches were used to evaluate phylogenetic patterns in forest woody vegetation occurring in ecotones comprising open areas and forest vegetation, and distributed across different regions in the southernmost Brazilian region. Those ecotones are composed by different forest vegetation types, which tend to expand over open areas. Data on species composition were compiled from previous studies, and vegetation sampling was carried out in sites without available information on species composition in ecotones. Two complementary phylogenetic metrics were used to evaluate the phylogenetic structure in each habitat type occurring in ecotones: net relatedness index (NRI) and principal coordinates of phylogenetic structure (PCPS). Analyses of NRI values did not show any clear pattern of phylogenetic structuring of the communities. Nonetheless, PCPS analysis showed consistent patterns across the threes spatial scales evaluated, which were independent of the species composition of the sites. Basal clades were associated with forest areas, while late-divergence clades were associated with open areas. These findings indicate that open areas act as a phylogenetic habitat filtering to forest woody species throughout the region, independently of the spatial scale and of the species composition in each site. The results suggest that the clades Rosanae and Asteranae represent the vanguard in theforest expansion process over open areas, while the distribution of the basal clade Magnolianae is restricted to forest sites. The search for general organization patterns in ecological communities based on their phylogenetic structure seems to be a useful tool for exploring and understanding the functioning of ecological systems. Such approach might benefit ecosystem managing and conservation strategies, as it simplifies complex ecological systems, and shows general patterns independently of the scale analyzed.
Barniske, Anna-Magdalena. "Mutational dynamics and phylogenetic utility of plastid introns and spacers in early branching eudicots". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-26261.
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