Dissertations / Theses on the topic 'Seeds'
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Go, Eun Byul. "Seeds." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1398095576.
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Hongu, Nobuko, and Alexandra M. Franklin. "Chia Seeds." College of Agriculture, University of Arizona (Tucson, AZ), 2016. http://hdl.handle.net/10150/625408.
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5 pp.Chia seeds are a popular food lately, which people have deemed as a superfood. Chia seeds are rich source of many vitamins and minerals as well as omega-3 fatty acids and fiber. This article explores the history of chia seeds, the nutritional benefits, as well as illustrates some ways to include this food into your diet.
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Sykes, Geoffrey. "Temporal and environmental influences on seed protein accumulation in soybean seeds." Thesis, Federation University Australia, 1991. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/164827.
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Suntaranond, Suphap. "Processes influencing deterioration in stored seeds." Title page, contents and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phs958.pdf.
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Clancy, Stephanie. "Seeds for change." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63496.pdf.
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Galup, Maria Cecilia. "Seeds| Sembrando futuros." Thesis, The University of Arizona, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10154360.
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“Somos semillas” — we are seeds is a slogan, a sentiment, and a belief that emerges and circulates in a myriad of spaces from Ferguson Black Lives Matter protests advocating for racial justice in the United States, to struggles against state violence in Ayotzinapa, Mexico, to climate justice and food sovereignty movements in Latin America. Seeds are both symbolic and material embodiments of futurity. In this dissertation, I examine the discourses around seeds, particularly genetically modified seeds (GM), and the role of biotechnology as our only purveyor of futurity. In “Seeds,” I examine the dominant discourses around GM seeds produced by pro-GM actors such as agro-industries including Monsanto and Syngenta, and USDAID programs such as Feed the Future. These discourses are constructed around social and environmental looming crises that include hunger and overpopulation, loss of biodiversity and climate change. In “Seeds,” thinking through the decolonial option, I challenge the single Western narrative that presents GM seeds and crops as the only path to solve these crises and for humanity to have a utopian future. “Seeds” takes on a ‘studying up’ approach that as scholar Laura Nader argues investigates those in power instead of those that are being oppressed. “Seeds” then works alongside other academic, indigenous, campesin@s, and farmer intellectuals and activists to elucidate a number of ways that people around the world are engaging with such crises and are building different paths to decolonial futures.
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Galup, Maria Cecilia I., and Maria Cecilia I. Galup. "Seeds: Sembrando Futuros." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/620667.
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"Somos semillas" -we are seeds is a slogan, a sentiment, and a belief that emerges and circulates in a myriad of spaces from Ferguson Black Lives Matter protests advocating for racial justice in the United States, to struggles against state violence in Ayotzinapa, Mexico, to climate justice and food sovereignty movements in Latin America. Seeds are both symbolic and material embodiments of futurity. In this dissertation, I examine the discourses around seeds, particularly genetically modified seeds (GM), and the role of biotechnology as our only purveyor of futurity. In "Seeds", I examine the dominant discourses around GM seeds produced by pro-GM actors such as agro-industries including Monsanto and Syngenta, and USDAID programs such as Feed the Future. These discourses are constructed around social and environmental looming crises that include hunger and overpopulation, loss of biodiversity and climate change. In "Seeds", thinking through the decolonial option, I challenge the single Western narrative that presents GM seeds and crops as the only path to solve these crises and for humanity to have a utopian future."Seeds" takes on 'studying up' approach that as scholar Laura Nader argues investigates those in power instead of those that are being oppressed."Seeds" then works alongside other academic, indigenous, campesin@s, and farmer intellectuals and activists to elucidate a number of ways that people around the world are engaging with such crises and are building different paths to decolonial futures.
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Balandra, Ruiz Allison Nicole, León Andrea Lizbeth Canales, García Víctor Deneil Medina, Aguilar Franklin Edwin Ordoñez, and Vega Mercia Maria Ramos. "Seven seeds nuggets." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/655743.
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Este emprendimiento fue planteado por un grupo de estudiantes pertenecientes al 10mo ciclo de la carrera de Administración y Negocios Internacionales. Los conocimientos adquiridos a lo largo de la carrera nos han permitido proyectar este modelo de negocio de manera correcta y precisa, por lo cual a continuación detallaremos lo trabajado. En primer lugar, se identificó el problema donde nuestros usuarios buscan alimentos alternativos que les permitan llevar una vida saludable y a su vez les otorguen nutrientes y proteínas para que puedan cumplir con sus actividades diarias. Por estas razones, creamos un producto ideal y alternativo que puede ser disfrutado en cualquier momento. Siendo así nuestro público objetivo jóvenes, deportistas, veganos y vegetarianos de las edades de 18 a 39 años pertenecientes al NSE A y B de Lima Moderna. Bajo este concepto nació “Seven Seeds Nuggets”, nuggets 100% naturales a base de 7 semillas, elaborada con ingredientes premium de nuestro país, como la quinua, kiwicha, cañihua, avena, maca negra, chía y linaza, este producto sigue un proceso artesanal, siendo una opción de snacks para ser compartida con otros alimentos. La tradición y orgulloso por nuestro país es lo que representa nuestro producto, gracias a su amplia variedad de insumos y textura ideal lo cual lo convierten en una opción sana y fresca. Para lograr todo lo anteriormente mencionado, hemos desarrollado un análisis, donde se ejecuta el Plan de Marketing, Plan de Operaciones, Plan de Recursos Humanos, Plan de Responsabilidad Social y Plan Financiero para la correcta evaluación de la empresa y viabilidad del proyecto.This project was raised by a group of students belonging to the 10th cycle of the International Business and Administration career. The knowledge acquired throughout the career has allowed us to project this business model correctly and precisely, for which we will detail what has been worked on below. In the first place, the problem was identified where our users look for alternative foods that allow them to lead a healthy life and in turn provide them with nutrients and proteins so that they can comply with their daily activities. For these reasons, we create an ideal and alternative product that can be enjoyed at any time. Thus, our target audience is young people, athletes, vegans and vegetarians from the ages of 18 to 39 belonging to the NSE A and B of Modern Lima. Under this concept was born "Seven Seeds Nuggets", 100% natural nuggets based on 7 seeds, made with premium ingredients from our country, such as quinoa, kiwicha, cañihua, oats, black maca, chia and linseed, this product follows a process artisanal, being an option of snacks to be shared with other foods. Tradition and pride in our country is what our product represents, thanks to its wide variety of inputs and ideal texture, which make it a healthy and fresh option. To achieve all the aforementioned, we have developed an analysis, where the Marketing Plan, Operations Plan, Human Resources Plan, Social Responsibility Plan and Financial Plan are executed for the correct evaluation of the company and the viability of the project.
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Amoda, Olu Moulton Marc. "Seeds of passage." Diss., Statesboro, Ga.: Georgia Southern University, 2009. http://www.georgiasouthern.edu/etd/archive/fall2009/olu_amoda/Amoda_Olu_200908_mfa.pdf.
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"A thesis submitted to the Graduate Faculty of Georgia Southern University in partial fulfillment of the requirements for the degree Master of Fine Art." Title from PDF of title page (Georgia Southern University, viewed on February 10, 2010). Marc Moulton, committee chair; Bruce Little, Julie McGuire, Gary Dartt, committee members. Electronic version approved: December 2009. Includes bibliographical references (p. 119-121).
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Chang, Yu-Wei 1977. "Isolation and characterization of proteins from chickpea (Cicer arietinum L.) seeds." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115839.
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Chickpea (Cicer arietinum L.) seed is a potential source of protein ingredients with desirable nutritional and functional properties. Knowledge of molecular characteristics of a food protein is essential before a protein can gain widespread use as a food ingredient. The objectives of this study were to prepare chickpea proteins using different extraction methods and precipitation methods and to investigate molecular characteristics using polyacrylamide gel electrophoresis (PAGE; Native and SDS), reversed phase high performance liquid chromatography (RP-HPLC) and electrospray ionization mass spectrometry (ESI-MS) techniques. Proteins of ground chickpea seed were extracted with sodium hydroxide (NaOH) and with citric acid solutions and precipitated with addition of acid and by cryoprecipitation. The protein contents of the protein preparation ranged from 49% to 97%. The microstructures of chickpea protein isolates examined by scanning electron microscope (SEM) revealed the presence of starch grains in the cryoprecipitates from citric acid extraction but not in isoelectric precipitates. The globulins (legumins and vicilins), glutelins, and albumins from both citric acid and NaOH isolates were characterized by Native-PAGE. The cryoprecipitates contained mainly the globulin-rich proteins. With SDS-PAGE characterization, protein subunits were identified as follows: (i) legumin subunits: MW 40, 39, 26, 23, and 22 kDa, (ii) vicilin subunits: MW 50, 37, 33, 19, and 15 kDa, (iii) glutelin subunits: 58, 55, and 54 kDa, and (iv) albumin subunits: 10 kDa. Separation of fractions of isolated chickpea proteins by RP-HPLC showed that early eluting fractions (Rt 20-30 min) consisted of subunits of MW 6.5-31 kDa (SDS-PAGE). At elution time 30-36 min, the fractions obtained were composed mainly of mixtures of legumin and vicilin subunits (MW 14-45 kDa). The major subunits of chickpea protein fractions from both cryoprecipitates and isoelectric precipitates are legumin basic subunit (MW∼23 kDa) and vicilin-rich proteins (MW∼19, 17, 15 kDa). ESI-MS analysis of fractions separated by RP-HPLC showed MW ranging between 5.1 and 53.5 kDa. The subunits of MW 35366, 27626, 22864, 20531, 16092, and 15626 Da of fractions from ESI-MS corresponded to MW 35.3, 28.0, 24.1, 20.5, 16.1, and 15.3 kDa identified in SDS-PAGE. These fractions were identified as legumin-rich and vicilin-rich proteins.
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Scott, Elizabeth. "The secret nature of seeds : science & seed improvement c.1520-1700." Thesis, University of East Anglia, 2016. https://ueaeprints.uea.ac.uk/59258/.
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The seed is an extraordinary time capsule that can travel across socially constructed and humanly defined borders and boundaries. While certain characteristics of the seed have been captured in botanical, agricultural, economic and garden history, what the seed also carries is a social history. The human relationship with the seed is complex, with the seed itself invested with different social and cultural meaning over time, place and periods in history. For the purposes of this research, a history of the seed is constructed in the early modern period in England, using as its narrative, the development of scientific knowledge. To understand how knowledge was accumulated and transmitted, the research argues that the ‘social’ everyday lives of men and women were formative in the creation of a scientific ‘culture’, that permeated this period in history. The thesis argues that the outcome of the scientific endeavours described in the treatises written by horticulturalists and husbandmen, led ultimately, to the social construction by the Puritan improvers, of a ‘model’ seed and the advent of the nurseryman.
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Koela, Ernie Nathi. "‘Seeds of the Braced Bow’ (The Flower, the Seed and the Bee)." Master's thesis, Faculty of Humanities, 2019. http://hdl.handle.net/11427/31398.
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'A journey! from a seed, to a flower through a bee… it is a relationship with nature that is silent, we do not know if either is conscious of this interaction but we know that we see plants and nature blossom because of this. Is this not also the story of the bow... who were the seeds the flowers and the bees? did they know? Those in the Film have dedicated their spirits in search of traditional spirits and healers - their medicine, sound and vibration; the trilogies map will follow their song! Be it the drum, bow or horn we will venture to move like the cultures and instruments of old like the nomadic Khoi and San!’ This is a sonic text, accompanied by visual reality, all the details are in the sounds gestures, smiles, eyes and interactions made in this text… these are not interviews but a journey through the gaze of an apprentice! A focus on the instrumentalist, as alchemist, sonic healer and cultural treasure. The end, to point to the reality of a rich shared h’story between Afro- Asia through the making of the musical bow!
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Seyedhosseini, S. H. "Ion implantation of seeds." Thesis, University of Salford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358378.
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Koshawatana, Chutima. "Physiological, biochemical and chemical studies on desiccation tolerance primarily in developing wheat seeds." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phk859.pdf.
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Bibliography: leaves 155-182. Most agricultural crop seeds are 'orthodox' ie. desiccation is a necessary feature of their complete life cycle. Low moisture content lengthens the storage life of orthodox seeds. Recalcitrant seeds, which do not tolerate low moisture content, lose viability in dry storage. The thesis studies the role of sugars in desiccation tolerance in developing seeds and investigates other mechanisms which might be involved in desiccation tolerance and desiccation sensitivity.
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Sekharan, Soja. "Aged soybean (Glycine max [L.] Merrill) seeds their physiology and vigor assessment /." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1135809134.
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Gorman, Ashley. "Understanding seed-soil adhesion by myxospermous seeds and their biophysical function in agroecosystems." Thesis, University of Dundee, 2019. https://discovery.dundee.ac.uk/en/studentTheses/33ec7318-88e9-4e39-9a31-c26a8b1a1638.
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Seedbanks provide many ecosystem services that support wildlife and regulate soil function. The fate of arable seeds is vital in shaping the aboveground composition of plant communities in agroecosystems. Understanding seed fate informs seedbank dynamics with multi-species interactions, as well as safeguarding arable biodiversity and food security. While many seed fate pathways are well known, the role of myxospermy in temperate agricultural soils is rarely addressed. Mucilage released by myxospermous seeds can modify the soil physical, hydraulic and microbial environment surrounding the seed. The principle biophysical mechanisms underlying the redistribution of weed seeds in eroded soils are unknown. It is possible that myxospermy delivers crucial services at the field scale, such as soil stability and water retention. However, modifications of the soil physical environment have been investigated using only a single-species approach and are often tested with extracted mucilage rather than seeds in-situ. As multiple taxa produce myxospermous seeds, the effects of a single species cannot be generalised. As seeds co-exist in the soil as multi-species communities, a multi-species approach is needed to further understand the functionality of seed mucilage and their implications for soil, relative to the wider seedbank. This thesis focussed on examining the mechanisms responsible for the adhesive interactions between soil and myxospermous seeds and discusses the ecological function and behaviour at the soil particle scale.
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Chien, Yung-hsin. "SHELF LIFE EXTENSION OF SEED BUTTER MADE WITH SESAME, SUNFLOWER AND PUMPKIN SEEDS." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449235219.
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Zanetti, Oliver Vivian. "Doing food security in practice : seeds, seed banking and preparations for the future." Thesis, Open University, 2013. http://oro.open.ac.uk/54706/.
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This thesis is about the banking of the seeds of food plants. It considers the practices and politics of that banking in order to understand its contribution to future food security scenarios. The thesis expands upon existing literature to provide new analytical and empirical insights into the preservation of biological materials. It does so by examining how practices undertaken in seed bank settings function to make seeds into materials of use to food security practitioners; an outcome which is achieved by the incorporation of banked seed into the framework of plant genetic resources. The thesis also contributes to knowledge on food security, by examining the function of those plant genetic resources within the food security milieu. First, the temporalities engendered by seed banking are analysed. Here, it is argued that seed banking assists in enhancing food security by acting as a mechanism which folds the plant genetic resource materials of the past and future together through work undertaken in the present. Second, the material politics of plant genetic resource preservation in a food security setting are explored, and a case is made for a framework by which seed may be banked "well"; a framework which is hinged on seed materiality. Overall, the thesis makes two key claims. First, that food security should not be regarded as a state that can be reached, but rather as an ongoing process of strengthening the food system as a whole. Second, that seeds must be regarded as materials with agency in seed banking practice, agency which impacts upon the practice of seed banking itself and on the wider political setting of that practice.
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Wu, Wei. "Spreading Seeds: Ai Weiwei's Sunflower Seeds and His Performative Personality Received in the West." Scholarship @ Claremont, 2017. http://scholarship.claremont.edu/scripps_theses/1046.
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In 2010, Ai Weiwei's Sunflower Seeds made its debut in Tate Modern, which promoted Ai to be one of the most famous and respected contemporary Chinese artists. This Conceptual art work has multiple layers of meanings, which all corresponds to the Western expectations for a successful contemporary Chinese artist. In fact, the Western art world has long held bias and stereotypes towards international artists. Ai chose to perform his personality to conform to the expectations and Western ideologies, which brought him international fame. On the other hand, other Chinese artists, including Cai Guo-Qiang and Zhou Chunya, don't totally agree with these Western ideologies, and therefore their fame in the society are less distinguished than Ai.
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Haigh, Anthony Mark. "Why do tomato seeds prime?: physiological investigations into the control of tomato seed germination and priming." Australia : Macquarie University, 1988. http://hdl.handle.net/1959.14/35668.
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Thesis (PhD) -- Macquarie University, School of Biological Sciences, 1988.Bibliography: leaves 112-121.
General introduction to seed priming -- Water relations of tomato seed germination -- Water relations to tomato seeds during priming -- Water relations of germinating primed tomato seeds -- Histological study of tomato seed germination and priming -- Endosperm weakening during germination and priming of tomato seeds -- General discussion -- References.
It is the aim of this thesis to examine hypotheses regarding the prevention of radicle emergence during priming and of the enhancement of germination following priming. This work should identify the control sites in the processes of radicle emergence and their modification during priming. -- For the most part these hypotheses are underlain by an analysis of germination as a special case of plant cell expansion. A study of cell expansion requires an understanding of the water relations of the tissues involved. Therefore, the sequence of events during the germination of tomato seeds was first examined through a water relations study then the changes caused by priming were examined. -- The study of the water relations of germinating tomato seeds revealed that the seeds came into Ψ equilibrium with the imbibitional solution, whereas, the embryo was measured at much lower Ψ. There was no evidence of a lowering of embryo Ψπ nor of an increase in embryo Ψp prior to radicle emergence. The embryo Ψ measurements need to be interpreted with caution for they are ex situ measurements and thus do not directly measure these properties in the seed. It is unlikely that a large ΔΨ could be maintained within the seed during imbibition. Thus the existence of a large seed to embryo Ψp can be inferred from these measurements. The moisture release isotherm of the excised embryo confirmed this inference. The endosperm tissue enclosing the embryo was found to restrict the hydration level of the embryo prior to its emergence. As the embryo was capable of expansive growth prior to radicle emergence, it was concluded that the weakening of the endosperm controlled radicle emergence in tomato seeds. -- During priming the tomato seeds were in Ψ equilibrium with the priming solution, but the embryo was not. As the embryo was capable of growth after 2 days of the 6 day priming treatment, it was concluded that radicle emergence was prevented by the maintenance of the endosperm restraint. Germinating primed seeds did not display a marked plateau during imbibition. Both seed and embryo water contents were higher than those of non-primed seeds. However, embryo Ψ and Ψπ were lower than those of embryos from non-primed seeds, eventhough embryo Ψπ measurements during priming had not revealed significant lowering. The relative growth rate of seedlings from primed seeds was higher than that of non-primed seeds for the first 12 h after radicle emergence.
The endosperm of tomato seeds consisted of two distinct cell types found in separate locations within the seed. At the micropylar end of the seed the endosperm cells had thin walls, whereas those in the rest of the seed had thickened walls. The outer walls of outermost endosperm cells in the rest of the seed had massively thickened walls whereas these were lacking from the outer cells of the micropylar region. -- All cells, except those of the root cap, contained protein bodies. The protein bodies of the micropylar region endosperm cells were seen to breakdown to form vacuoles prior to radicle emergence. The protein bodies in other cells did not appear to change prior to this time. During priming protein body breakdown was more extensive in the micropylar region endosperm cells and vacuole formation also occurred in the radicle. After radicle emergence the cells of the radicles from primed seeds were found to be about 50% larger than those of the radicles from non-primed seeds. -- Endosperm weakening preceded radicle emergence in tomato seeds. Slower germinating seeds within the population had higher values for endosperm resistance. Endosperm weakening during priming resulted in values for endosperm resistance which were lower than those measured from a population of germinating non-primed seeds. Germinating primed seeds had resistances which were similar to those of priming seeds. It was concluded that a final rapid endosperm weakening step may be necessary for radicle emergence to occur. -- These studies have shown that tomato seeds prime because the endosperm does not weaken sufficiently to permit expansion of the radicle. The mechanism by which some endosperm weakening was permitted, but the final weakening for radicle emergence was prevented was not identifiable. Priming advanced the timing of radicle emergence by improving the rate of water uptake by the seeds; by eliminating the time necessary for the loosening of embryo cell walls and by permitting the completion of the first step of the endosperm weakening process. Enbryos from primed seeds had improved cell wall extensibilities which permitted higher relative growth rates during the first 12 h after radicle emergence.
Mode of access: World Wide Web.
x, 121 leaves, 4 leaves of plates ill
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Wilson, Dale Owen. "Threshing injury and mathematical modeling of storage deterioration in field bean seed (Phaseolus vulgaris L.) /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487268021746847.
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Murahidy, Analeise Clare. "The microbial decomposition of seeds." Thesis, University of Canterbury. Microbiology, 2001. http://hdl.handle.net/10092/6860.
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The seed component of plant litter and its associated nutrients has been largely ignored in litter fall, decomposition and ecosystem nutrient budget studies. The exclusion of this fraction potentially underestimates the transfer of energy and nutrients within the ecosystem. This study investigated the seed substrate characteristics and the microbial decomposition of 10 species. A combination of microcosm and in situ experiments were used to manipulate rate-regulating factors of decomposition and measure their influence on the variables of mass loss and net nitrogen mineralisation.
Mass loss from whole seeds, decomposed under controlled conditions for 180 days, varied between 0.7% (Sophora microphylla) and 77.7% (Triticum aestivum) with the net nitrogen mineralisation varying between 0.1% (Quercus robur) and 67.1% (Ulex europaeus). The greatest amount of inter-species variation in the decomposition rate could be explained by the proportional allocation of seed mass to the seed coat fraction (r=-0.7058, P=0.0001). Alterations to the integrity of the seed coat by artificial treatments, such as scarification, heat, or grinding, and natural mechanisms, such as seed immaturity or insect damage, accelerated the rate of decay in the initial 90 days of incubation. The decomposition of seeds in combination with leaf and wood litters resulted in significant non-additive effects. The mass loss from litter mixtures exhibited both synergistic and antagonistic effects. A reduced release of nitrogen occurred in all litter mixtures. Simulated freezing and desiccation events decreased the rate of seed decomposition. The estimated mean time for 95% mass loss from whole seeds was extended from 3.6 years under constant conditions to 4.5 years and 9.0 years when exposed to cyclical wet-and-dry and freeze-and-thaw conditions respectively. The net nitrogen mineralisation was generally reduced under cyclical conditions, with the exception of the Nothofagus species. A mean mass loss of 43 ± 8% and nitrogen loss of 42 ±12% was measured from seeds incubated in situ. The effect of soil microbes on decomposition was investigated by incubating seeds under standardised temperature and moisture conditions in 3 different soils. The rate of decomposition generally declined with an increase in soil acidity.
The results of this study illustrate that the seed component of plant litter comprises a high quality substrate for microorganisms. The nutrients of seeds are generally readily mobilised and available for utilisation by other components of the ecosystem.
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Böber, Elisabeth. "Seeds of Change : Urban Agriculture." Thesis, Blekinge Tekniska Högskola, Sektionen för planering och mediedesign, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5837.
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Nowadays more than half of the world´s population lives in cities. Urbanization is viewed as the primary cause of many problems, but also as the primary stage for more sustainable development in the 21st century. But the increasing and ongoing urbanization changes the economic, social, environmental and political setup of cities and can have several negative impacts related to economic and social inequities and environmental damage. At the same time the global sustainability challenges intensifies. Especially cities need to become more sustainable; they need to abolish their dependence on the unsustainable management of resources like water, energy and food.
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Abo-Gharsa, Salah M. "Studies on enclosed imbibed seeds." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305097.
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Norem, Margaret. "DELEP Seeds Arrive in Svalbard." University of Arizona (Tucson, AZ), 2011. http://hdl.handle.net/10150/556795.
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Yazici, Erol 1961. "Pneumatic harvesting of jojoba seeds." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277230.
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A pneumatic harvesting method for jojoba seed was investigated. By constructing a stationary experimental unit, the motion of jojoba seeds and stones, which were close in size and weight to seeds, were examined under the effect of positive, negative, and a combination of both pressures. It was determined that there was a reasonable difference in the motion depending upon test conditions and head design. A vacuum head was designed based on the observations and data obtained from the experiments. Using this head it was possible to pick up jojoba seed without picking up stones. A nonstationary unit was constructed to examine the effect of ground speed on picking efficiency. Results showed that a cleaner harvest using a normal ground speed can be obtained with the new head than with conventional equipment. A blowing head was added to windrow seeds and increase the capacity of the machine. It was determined that when the two heads were used together harvesting field capacity increased, however reduced efficiency was found.
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Khalif, Ahmed Sheikh Hassan. "GERMINATION RESPONSES OF SORGHUM VARIETIES (SORGHUM BICOLOR L. MOENCH) TO FUNGICIDE SEED TREATMENTS." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275262.
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Lestander, Torbjörn. "Multivariate NIR studies of seed-water interaction in Scots pine seeds (Pinus sylvestris L.) /." Umeå : Dept. of Silviculture, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/s282.pdf.
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Tasaki, Hiromi. "Light Effect on Seed Chlorophyll Content and Germination Performance of Tomato and Muskmelon Seeds." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/43868.
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The stage of maturity of seeds at harvest is an important factor that determines seed vigor. Separating seeds from a seed lot composed of many different stages of development can be difficult especially after maximum dry mass is attained. Separating seeds based on their physiological maturity is more challenging than sorting seeds based on their physical properties. Seeds may be non-destructively sorted using chlorophyll fluorescence (CF) as a marker of seed maturity. This study was conducted to test whether CF could be used to remove low vigor immature seeds from muskmelon (Cucumis melo L.'Top Mark') and tomato (Lycopersicum esculentum) seed lots. Light treatments were applied to determine whether the light environment during seed harvesting and processing could affect chlorophyll content and seed vigor. Seeds from nine stages of development were collected from 'TopMark'. Seeds from three stages of fruit development (red ripe, breaker, and mature green) were harvested from tomato cultivar Money Maker and two phytochrome mutants: phytochrome A mutant, fri-1 and phytochrome B mutant, tri-1. The SeedMaster Analyzer (Satake USA Inc., Houston Texas) was used to measure CF and to sort individual seeds according to CF levels. Immature tomato seeds and muskmelon, harvested from green fruits, had the highest CF (p>0.001). Contrary to the results obtained with the other tomato genotypes, the vigor of tri-1 did not change inversely with changing CF levels, rather, seeds with low CF had the same vigor as seeds with high CF. This result may suggest that the presence of phytochrome B exerts an inhibitory influence on vigor in tomato seeds, and that the persistent presence of chlorophyll during seed development does not affect vigor. The light treatments had no consistent effect on seed chlorophyll content or on vigor in either tomato or muskmelon.Master of Science
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Tangney, Ryan James. "Fire intensity, seasonal variation and seeds traits may influence seed fates in Banksia woodlands." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75785.
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This thesis presents a multifaceted approach to understanding seed survival during fire. I considered seed survival of high temperatures in the context of seed moisture content, soil temperature, and seed depth in the soil profile. I identified several seed traits associated with seed survival and seedling emergence depth. I modelled seasonal variation and interactions between these traits, fuel dynamics and soil temperatures to identify conditions and periods for burning that minimise risk of seed mortality.
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O'Donoughue, Louise (Louise S. ). "A study of seed dehiscence in the genus Lotus (Fabaceae) using interspecific hybridization and embryo culture /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65420.
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Loehrlein, Marietta Margaret 1957. "Priming techniques and size characteristics of triploid and tetraploid watermelon seed." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276845.
Full textAbstract:
Triploid and tetraploid watermelon seed are visually indistinguishable, increasing costs to growers, who cannot market the low-quality 4N melons. Efforts were made to separate 3N and 4N seeds by thickness and weight. Means in both cases were not separable. Successful seed 'priming' would be beneficial to seedless watermelon growers. Seeds from the open-pollinated 4N x 2N cross were primed in solutions of distilled water, polyethylene glycol '8000' (PEG), and potassium nitrate (KNO₃), or left untreated; treated seeds were subsequently dried for either 1 or 7 days. Seeds were scored for germination or emergence in the lab and for emergence under field conditions. Water was better than KNO₃ or PEG, but not always better than the control. One day in treatment was superior to 3 or 6 days; length of drying time was insignificant. In the field trial, treatments did not differ in emergence.
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Turkoglu, Selda St. "Screening Of Tomato Seeds For Genetic Modification And Identification Of Genetically Modified Ripening Delayed Tomato Seeds." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608510/index.pdf.
Full textAbstract:
Tomato has been genetically modified for providing properties such as insect-resistance or delayed-ripening. Tomato seeds purchased from several bazaars and markets were screened for the presence of genetic modification by targeting NptII kanamycin resistance, Nos terminator, and 35S promoter gene regions which are the most commonly transformed gene regions in transgenic plants, and then ripening-delayed tomato seeds were tried to be identified in this study. F type truncated-PG gene and Sam-k gene were selected as the indicator of genetically modified ripening delayed tomatoes. DNAs of 25 seed samples were isolated by CTAB method and examined with several primer pairs, and the primer sets that provided consistent results were selected to conduct routine testing by PCR analysis of the samples. In screening analysis via conventional PCR, 4 samples were amplified with 35S, Nos and NptII primer sets. Among other samples, 3 of them were amplified with 35S and Nos primer sets and 2 of them were amplified only with 35S primer set. The amplification was observed with Nos, NptII and Sam-k primers in one sample and this sample was identified as 35 1 N, since the sequence result of the PCR product amplified with Sam-k primers showed high homology with the Samase gene of T3 Coliphage. F type truncated PG gene was not observed in any
of the samples.
Although this study demonstrates the presence of commonly used gene regions in genetically modified tomatoes, further analysis of the genetically modified ripening delayed tomato seeds via construct specificor event specific PCR techniques is needed for confirmation.
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Grasty, Monica R. "Let the Seeds Fall Where They May: Investigating the Effect of Landscape Features on Fine-Scale Seed Dispersal." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/4001.
Full textAbstract:
Seed dispersal is a crucial ecological and evolutionary process that allows plants to colonize sites and expand their ranges, while also reducing inbreeding depression and facilitating the spread of adaptive genetic variation. However, our fundamental understanding of seed dispersal is limited due to the difficulty of directly observing dispersal events. In recent years, genetic marker methods have furthered our understanding of colonization and range expansion due to seed dispersal. Most investigations focus on regional scales of dispersal, due to low levels of variation in the chloroplast genome (cpDNA), which can serve as an indirect measure of seed dispersal. Here, I employ a whole-genome assay of cpDNA variation in Plagiobothrys nothofulvus to resolve variation due to patterns of seed dispersal within a 400x400 meter section of the Whetstone Savanna Preserve in Central Point, OR, USA. Whetstone is characterized by a mosaic of habitat types, including vernal pools, hummocks of dry prairie, and large Ceanothus cuneatus bushes, as well as a network of vole runways. Plagiobothrys nothofulvus grows in dense patches on hummocks within this prairie.
I found evidence of limited seed dispersal in P. nothofulvus, indicated by strong genetic structure over distances of less than 100 meters. There was little evidence that geographic distance predicts genetic distance; environmental features have a stronger influence on dispersal. Habitat preference was the strongest predictor of genetic variation in P. nothofulvus, indicating that it may be a habitat specialist in this prairie. Flower density also accounted for a significant portion of dispersal, which may be a consequence of the annual life history of P. nothofulvus resulting in seasonal turnover and lack of competition with adult plants. Least-cost-path analysis indicated that seeds are secondarily dispersed by small mammals along vole runways. Overall, I found significant evidence that landscape features influence dispersal, even at a very fine spatial scale.
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Bengtsson, Emil. "Doseplanning ocular tumors with 125I-seeds." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7211.
Full textAbstract:
Since 1986 patients with ocular malignant melanoma have been treated with Ru-106 plaques at S:t Erik Eye Hospital. In 1998 I-125 radioactive seed plaques was presented as an alternative to Ru-106 when treating tumors with an apical height greater than 7 mm. Until June 2005 the doseplanning of these plaques was based on a depth-dose curve made in the dose planning system Cadplan supplied by Varian Medical Systems. In the recent years the capabilities of computerized 3D dose planning system has increased greatly. The number of types of seeds on the market has also increased.
In order to implement the modern 3D dose planning system Brachy Vision 7.3.10 in planning the I-125 plaques, a review of the dose planning process have been done.
The ultra sound equipment used by the ophthalmologist to determine the apical height of the tumor has been investigated in terms of accuracy. A phantom has been developed for this task.
As new seeds entered the market a comparision have been made comparing the Amersham 6711 seed with the Bebig I25.S06 seed. A method for measuring the activity of the single seeds has also been developed.
The dose planning system Brachy Vision 7.3.10 have been compared to the old dose planning method, and an implementation of the plaques into Brachy Vision have been made.
The ultra sound equipment was accurate in the regions of interest. It was also discovered that the Bebig I25.S06 seed gave slightly higher dose compared to the Amersham 6711 with the same activity. The difference between the seeds is however small. The results indicate that the old dose planning method gave a slight underdosage.
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Kågesson, Filip. "Fuzz Testing Modbus using Optimized Seeds." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44765.
Full textAbstract:
The complexity of industrial internet of things devices increases since new network protocols should be incorporated while still maintaining backward compatibility with existing protocols. When the complexity of the devices increases, the need for testing also increases, which can be performed using fuzz testing. Fuzz testing is a highly automated testing technique that has developed to become a fast and efficient way of detecting bugs in different systems, including network protocols. In this thesis, a complete fuzz testing framework is developed, which considers and motivates both the choice of seed selection strategy and the choice of fuzzer. The system under test used in this thesis is an implementation of the Modbus protocol provided by a company called HMS Networks, designed to run on an industrial internet of things device. The fuzz testing framework is used to evaluate the performance of the unweighted minimal set seed selection strategy originally presented elsewhere by comparing it to the afl-cmin strategy and selecting seeds at random. The results obtained when comparing the seed selection strategies contradict the earlier results in five out of six cases, making it interesting to perform further experiments to allow stronger conclusions to be made regarding the performance of the unweighted minimal set strategy.
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Shafer, Floyd L. (Floyd Lorenz). "Interaction of Microwaves and Germinating Seeds." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc331641/.
Full textAbstract:
This investigation was concerned with determining the interaction of microwaves with germinating seeds. This study covers two different approaches. The preliminary efforts covered the response of germinating seeds to treatment by microwaves and heat. The second phase of the investigation used microwaves as a probe to determine some of the processes of early seed germination.
The preliminary investigation measured the internal metabolic process by ATP production. Leakage of ions and organic material from germinating seeds indicated that membranes are a target of microwaves and heat. Electron photo-micrographs showed an increase in damage to membranes as heat and microwave treatments were increased.
The second phase of this investigation was concerned with determining some of the biological activity at the initiation of germination of wheat seeds, Triticum aestivum L., using a resonating microwave cavity oscillating at 9.3 GHz as a probe. Direct current conductivity measurements were also made on the seeds as a means of confirming the observations made with the microwave cavity.
There was no observable difference between treatment by UHF or heat in the ultrastructure of germinating seeds. A dielectric response far above that of free water was found as live seeds of wheat began to imbibe water. This effect was assumed to be due to the release of ions, because conductivity increased as corresponding quantities of water were imbibed; and both conductivity and dielectric response decreased as imbibition progressed. Although dead seeds also imbibe water, they do not show this decrease in dielectric response. The dielectric response of live seeds was reduced after the initial imbibition, showing that water became tightly bound as imbibition progressed.
The dielectric response of actively growing shoots from the seeds was much less than that of the seeds themselves. The large quantity of water in the shoots is assumed to be immobile, being tightly bound within the membranes, enzymes, and organelles.
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Lehle, Fredric R., and Omer K. Ahmed. "Fermentation in Cotton (Gossypium hirsutum) Seeds." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/204520.
Full textAbstract:
Ethanol and acetaldehyde production by cotton seeds subjected to anoxic stress imposed by CO₂ or N₂ gas was quantified during the imbibition phase. Fermentation capacity was low in dry seeds and quickly increased during the first few hours of imbibition. In hydrated seeds, ethanol and acetaldehyde excretion following anoxic stress followed a linear trend in time. Ethanol excretion exceeded that of acetaldehyde by an order of magnitude. Similar rates of production were observed whether anoxic was imposed by either CO₂ or N₂ gas. Excreted ethanol and acetaldehyde were rapidly metabolized following alleviation of anoxic stress.
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Mirdad, Zohair M. "The evaluation and improvement of seed quality and storage potential in cauliflower and cabbage seeds." Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288381.
Full textAbstract:
This study aimed to improve seed quality in cauliflower and cabbage, firstly though the development of rapid methods for the evaluation of germination and seed storage potential using measurements of seed leachates conductivity and secondly, through the application of seed treatments both as pre-storage treatments and to improve germination under stress conditions. Significant negative correlations between germination and the conductivity of seed leachate were observed both when seed had high germinations after ageing and when a range of germinations resulted from either combinations of dead plus living seeds, or ageing. This suggested that conductivity measurements could be applied to predict seed germination. Seed quality declined during storage at two moisture contents (12% and 6.5%) and two temperatures (25oC and 35o C) as reflected by the increase in seed leachate conductivity and decline in germination and vigour. Differences in seed storage potential were best predicted by the controlled deterioration (CD) test and by CD followed by measurements of leachate conductivity. Other pre-storage assessments (laboratory germination, Ki, conductivity) were less consistent in prediction of storage potential. The second approach used to improve seed quality was to apply pre-storage seed treatments to improve seed storage potential. The most striking improvements in seed storage potential occurred after pre-storage hydration treatments, aerated hydration (AH) for 12h or 18h and water soaking for 3h or 6h, with smaller improvements after antioxidant treatments (0.1% a-tocopherol and 0.1% ascorbic acid). Halogenation (I2) treatment had no effects on storage potential. Improved seed quality was also revealed after AH treatment by both the increased ability of seed to germinate at high temperature (35oC) and more rapid germination at reduced water potential and under salinity stress. AH treatment also increased the ability of seeds to recover from exposure to higher temperature (40oC) and reduced water potential (-1.90 MPa).
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Konesky, David William. "Embryo-independent mobilization of endosperm starch in cereal seeds." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29984.
Full textAbstract:
Endosperm mobilization studies in cereal seeds are typically based on the view that α-amylase synthesis in the aleurone tissue is controlled by gibberellins from the germinating embryo. However, α-amylase is often produced by de-embryonated endosperm segments in the absence of added gibberellins. Two specific systems exhibiting this phenomenon were examined; 1) the ability of amino acids to promote α-amylase production in de-embryonated wild oat segments and, 2) autonomous starch hydrolysis (in the absense of exogenous GA₃ or amino acids) in de-embryonated barley endosperm halves.
Specific technical problems were addressed prior to the onset of these studies. Captan (66 μM) controlled fungal contamination in the incubation medium without inhibiting GA₃-induced sugar release, which occurs following seed sterilization in hypochlorite and ethanol. The Nelson-Somogyi reducing sugar assay was not suitable for quantifying sugar levels in incubation solutions containing amino acids as cysteine, cystine, serine, tryptophan and tyrosine interfered with the assay. Absorbance (540 nm) increased as concentrations increased from 0.1 to 1 mM; simultaneous additions of amino acids with glucose resulted in absorbance values higher than glucose alone. MnCl₂ (0.5 mM) inhibited absorbance in the presence of glucose and the amino acids serine, cystine, and tryptophan.
The ability of individual amino acids to promote α-amylase production in wild oat endosperm halves is yet unclear. Although certain amino acids were shown to enhance enzyme production, the level was often quite different between replicated experiments. However,
incubation of endosperm halves in a mixture of 18 amino acids
consistently promoted α-amylase synthesis; enzyme production was further
enhanced if a level of GA₃ (10⁻⁹ M), which was too low to promote α-amylase synthesis alone, was included within the amino acid mixture.
Autonomous endosperm mobilization (AEM) was variable in different barley cultivars. High sugar release correlated well with α-amylase production; the levels were similar among individual cultivars harvested in two different seasons. The onset of AEM was delayed, as the majority of sugar was released in the second day of incubation. AEM was greatly reduced by inhibitors of RNA (6-methyl purine) and protein (cycloheximide) synthesis suggesting that AEM was a result of the de novo synthesis of α-amylase. Incubation conditions greatly affected AEM. Although AEM was high at acidic pH (4.6-5.6), it was greatly reduced at basic pH (7.6-8.6). AEM increased as the temperature was raised to 28°C. Low levels of Ca²⁺ (0.25-0.5 mM) enhanced AEM whereas higher amounts (0.5-1 mM) were inhibitory.
Incubation of wild oat endosperm halves in solutions of
pre-emergence herbicides affected GA₃-induced sugar release to varying
extents when applied at field application levels. Only triallate (22%
reduction) and trifluralin (21% reduction) prevented sugar release (only - 5
at 3x10⁻⁵ M); no inhibition was seen following incubation in EPTC (5xl0⁻⁵, 5xl0⁻⁶ M), metribuzin (5xl0⁻⁶, 1x10⁻⁶M) and oryzalin (3xl0⁻⁵, 3x10⁻⁶M). However, the higher concentrations of each herbicide effectively inhibited the development of wild oat seedlings.Land and Food Systems, Faculty of
Graduate
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Baker, Jillian Sarah. "Seeds of Hope, Seeds of Liberation: An Exploration of the Growth of Liberation Theology in the Philippines." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3090.
Full textAbstract:
Thesis advisor: Roberto GoizuetaHaving first spoken to the situation of the poor in Latin America, liberation theology is a movement that has empowered the marginalized in a number of different regions and oppressive contexts. This thesis explores the growth of liberation theology in the Filipino situation by drawing on the history and present state of the Philippines and the author’s own experiences in the country. After a description of the history of colonialism, the development of the political systems, and the condition of the environment, the paper also describes the genesis of liberation theology in Latin America as a template for Filipino liberation theology. The next chapter details the current movements for liberation in the Philippines, particularly how they apply to the political and environmental realities of the country. The author’s own stories of accompanying a marginalized community of persons with disabilities are included as instances of liberation among the Filipino people
Thesis (BA) — Boston College, 2013
Submitted to: Boston College. College of Arts and Sciences
Discipline: College Honors Program
Discipline: Theology
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Vogler, Wayne Douglas. "Autoecology of Sporobolus pyramidalis with emphasis on seed ecology /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16730.pdf.
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Van, Tonder Nicolaas Christiaan Petrus. "Seed treatment of maize, sorghum and sunflower with effective micro- organisms." Thesis, [Bloemfontein?] : Central University of Technology, Free State, 2012. http://hdl.handle.net/11462/141.
Full textAbstract:
Thesis (M. Tech. Agriculture) -- Central University of Technology, Free state, 2012A series of incubation studies and greenhouse experiments were conducted to evaluate the use of EM seed treatments, at different application levels, handling techniques and soil conditions on germination and seedling vigour of selected cultivars of maize, sorghum and sunflower. Two incubation studies were conducted to evaluate the germination and seedling vigour of maize, sorghum and sunflower seeds treated with M-EM from three different suppliers, multiplied at two different ratios (1% and 3%) and diluted at three different levels (0.01%, 0.1% and 1.0%) compared to a control treated with pure water. Results revealed no significant differences under optimum germination conditions, while seedlings under cold stress indicated that M-EM treatments positively affected germination and seedling vigour compared to the control treatments. Two incubation studies were also conducted to evaluate the germination and seedling vigour of maize, sorghum and sunflower seeds treated with M-EM from three different suppliers, multiplied at two different ratios (1% and 3%) and exposed to the influences of irradiation and temperature fluctuation. From the results became clear that the correct storage and handling is essential in optimizing the effect of M-EM on seeds. Even though M-EM was exposed to irradiation and temperature fluctuation, M-EM still had positive effects on germination and seedling vigour. Pot experiments were conducted to determine the effect of EM as seed treatment, at different dilutions, on germination, seedling vigour and dry mass of maize, sorghum and sunflower at different planted depths. Germination were not affected by the M-EM treatment, while shoot length results indicated that seed treated with M-EM could have significant effect on seedling survival. A greater effect was visible on the shoot length of shallow planted seeds, than on deeper planted seeds. From the results no single company, ratio or dilution could be prescribed as paramount. To further investigate the effect of M-EM subjected to the influences of irradiation and temperature fluctuation; maize, sorghum and sunflower seeds were treated with M-EM from three different suppliers, multiplied at two different ratios (1% and 3%) and exposed to the influences of irradiation and temperature fluctuation and planted in soil. M-EM treatments only benefited the germination of deeper planted sorghum seeds compared to the control treatments. The shoot lengths of deeper planted maize and sunflower seed were positively increased by the M-EM treatments while also resulting in significant results for the overall shoot length of sorghum. The third pot study was conducted to determine the influence of EM as a seed treatment on maize, sorghum and sunflower planted in three different soils, namely: sterilized soil, soil treated with M-EM and Fusarium containing soil. Germination and seedling vigour results of the sterilized and M-EM treated soil revealed to be superior to that of the Fusarium containing soil. From the results was concluded that M-EM treatments will probably improve early seedling growth of maize, sorghum and sunflower compared to untreated seed and that M-EM seed treatment and a pre-plant EM soil treatment might assist seeds in unfavourable germination and growth conditions.
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Garcia, Emilio. "Chuva de sementes em um fragmento de floresta estacional semidecidua em Campinas, SP." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316276.
Full textAbstract:
Orientador: Wesley Rodrigues SilvaDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: A região de Campinas foi descrita como uma das áreas mais devastadas do estado. Dessa forma, a Mata Santa Genebra, uma das maiores reservas urbanas do mundo, apresenta grande importância, não apenas acadêmica, mas para o município em geral. A elaboração de um plano de manejo e de recuperação florestal torna-se cada vez mais necessária nesse tipo de fragmento, sendo que o estudo da dinâmica da chuva de sementes serve como um importante subsídio na elaboração desse plano. Assim, o presente projeto tem como objetivo principal avaliar se há diferenças na chuva de sementes entre as diferentes fisionomias vegetais nessa mata. Os resultados obtidos mostram que há diferenças significativas entre a abundância e a diversidade de sementes em diferentes escalas. As áreas de borda de mata e a área que sofreu um incêndio recente apresentam abundâncias e diversidades de sementes significativamente menores do que os valores encontrados no interior da floresta (área mais preservada) e no brejo. Essas diferenças podem ser explicadas de três maneiras. A primeira leva em consideração os fatores microclimáticos decorrentes da proximidade dessas áreas a uma matriz diferente (cana de açúcar). Nessas áreas há a possibilidade de uma maior incidência de ventos e de luminosidade, que poderiam em ultima instancia influenciar negativamente a abundância e a diversidade de plantas nessas áreas. Por este ponto de vista a chuva de sementes seria apenas um reflexo da comunidade vegetal. A segunda explicação possível é que estes mesmos fatores microclimáticos podem influenciar negativamente as interações mutualísticas entre as plantas e seus dispersores. Essas áreas são teoricamente mais desprotegidas contra ventos e predadores. A terceira explicação esta mais ligada a área queimada, diversos autores discutem que após uma queimada a área entra em um processo sucessional semelhante a abertura de uma clareira. Em um dos estágios sucessionais, é prevista uma maior abundância de arbustos, trepadeiras e gramíneas. Se considerarmos que a área queimada ainda esta em um estágio sucessional inicial podemos esperar que a diversidade e a abundância de sementes do extrato arbustivo arbóreo seja significativamente menor do que os encontrados para uma área em estágio sucessional mais avançado (interior da mata). Outro dado importante nos mostra que os efeitos microclimáticos a 3m da estrada que circunda a mata podem resultar numa redução ainda maior na abundância e na riqueza sementes em relação a uma faixa um pouco mais interna (10 ¿ 25m). Quando mudamos de escala encontramos outras diferenças. Ao compararmos áreas de borda que sofreram uma estratégia de manejo (limpeza de trepadeiras e gramíneas, plantio de espécies de árvores nativas) com áreas de borda intocadas, não encontramos diferenças significativas nem para abundância de sementes nem para a diversidade de sementes, isso nos mostra que pelo menos do ponto de vista da chuva de sementes a estratégia de manejo ainda não foi eficiente. Nosso trabalho mostrou, que do ponto de vista da chuva de sementes, a situação da Mata Santa Genebra é extremamente preocupante. Além de poucas sementes chegarem ao solo nas áreas de borda e queimada, a abundância média de sementes por metro quadrado chegando ao solo da mata como um todo é significativamente menor do que o encontrado em outros fragmentos florestais. O nosso trabalho torna-se assim um importante subsídio para a elaboração de estratégias de manejo eficientes e longo prazo para a manutenção de um dos maiores e mais importantes fragmentos florestais urbanos do país
Mestrado
Ecologia
Mestre em Ecologia
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Kellerman, Millicent Johanna Susanna. "Seed bank dynamics of selected vegetation types in Maputaland, South Africa." Diss., Connect to this title online, 2004. http://upetd.up.ac.za/thesis/available/etd-02012005-090837.
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Cavalcante, Filho Francisco Nahum. "Revestimento e armazenamento de sementes de Brachiaria humidicola (Rendle) Schweick e Brachiaria brizantha (Hochst. ex A. Rich.) Stapf." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256951.
Full textAbstract:
Orientadores: João Domingos Biagi, Leila MartinsTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agricola
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Resumo: O revestimento constitui-se num grande avanço na produção tecnológica de sementes, inclusive de forrageiras. Apesar da crescente utilização dessa tecnologia pelas empresas produtoras de sementes nos últimos anos, poucas são as informações publicadas em relação ao comportamento de sementes revestidas durante o período de armazenamento. Os experimentos foram realizados na Faculdade de Engenharia Agrícola - FEAGRI/UNICAMP, com o objetivo de obter informações adicionais sobre a qualidade fisiológica de sementes de Brachiaria humidicola (Rendle) Schweick e Brachiaria brizantha (Hochst. ex A. Rich.) Stapf, submetidas a diferentes tratamentos. No início e após 45, 90, 135, 180, 270 e 360 dias de armazenamento nas temperaturas ambiente, 30°C e 40°C, as sementes foram submetidas às avaliações do grau de umidade (U), germinação (G), viabilidade-tetrazólio (TZ), envelhecimento acelerado (EA), primeira contagem de germinação (1ªCG), emergência das plântulas em areia (E), comprimento da parte aérea das plântulas (CPA), índice de velocidade de emergência (IVE), peso seco da plântula (PSP), peso de mil sementes (PMS) e atividade de água (Aw). Foi utilizado um delineamento inteiramente casualizado, com quatro repetições por tratamento e três temperaturas de armazenamento. A análise estatística foi realizada através do teste de Tukey para comparação das médias, em nível de 5% de probabilidade. Na avaliação do início do período de armazenamento as sementes tratadas tiveram resultados em valores absolutos superiores à testemunha, com superação da dormência para as duas espécies, sem diferenças estatísticas significativas. As sementes incrustadas tiveram redução acentuada do seu grau de umidade, com média de 2,80 para Brachiaria humidicola e de 2,90 para Brachiaria brizantha ao longo do armazenamento. Os maiores porcentuais de germinação ocorreram em períodos distintos para as espécies, aos 270 dias para Brachiaria humidicola e aos 135 dias para Brachiaria brizantha. A escarificação química das sementes com ácido sulfúrico é uma alternativa de tratamento se a intenção for realizar a semeadura até 45 dias após a colheita. Para armazenamento por períodos mais longos, a técnica de revestimento por incrustação é uma importante alternativa, pois não prejudica a germinação e permite a adição de diversos produtos químicos à semente, aumentando o seu valor agregado
Abstract: The coating is to be a major technological breakthrough in the production of seeds, including grasses. Despite the increasing use of technology by seed companies in recent years, there are few published information about the behavior of coated seeds during the storage period. The experiments were performed at the College of Agricultural Engineering, FEAGRI/ UNICAMP, in order of obtaining information about the physiology quality of Brachiaria humidicola (Rendle) Schweick and Brachiaria brizantha (Hochst. ex A. Rich.) Stapf. seeds, submitted to different treatments. At the beginning and after 45, 90, 135, 180, 270 and 360 days of storage at ambient conditions and at temperatures of 30°C and 40°C. The seeds were evaluated by moisture content, germination, feasibility-tetrazolium, accelerated aging, first count germination, seedling emergence in sand, seedling length, speed of emergency index, seedlings dry weight, thousand seeds weight and water activity. A completely randomized design with four replications per treatment and three storage temperatures. Was used statistical analysis was performed using the Tukey test at 5% probability. The assessment at the beginning of storage the treated seeds were found to have absolute values greater than control, with dormancy for both species, no statistically significant differences. The incrusted seeds were embedded substantially reducing the moisture content, averaging 2.80 for Brachiaria humidicola and 2.90 for Brachiaria brizantha during storage. The highest percentage of germination occurred at different times for the species, to 270 days for Brachiaria humidicola and 135 days for Brachiaria brizantha. The chemical scarification of seeds with sulfuric acid is an alternative treatment if the intention is either to sow until 45 days after harvest. To store for longer periods, the technique of incrusting is an important alternative, since not affect the germination and allows the addition of various chemicals to the seed, increasing its aggregate value
Doutorado
Tecnologia Pós-Colheita
Doutor em Engenharia Agrícola
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Parisi, João José Dias. "Associação entre fungos e a viabilidade de sementes de Inga vera subsp. affinis (DC.) T.D. Penn. durante o armazenamento." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256849.
Full textAbstract:
Orientadores: João Domingos Biagi, Claudio José BarbedoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agrícola
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Resumo: O elevado metabolismo dificulta a manutenção da viabilidade de sementes de Inga vera. As principais estratégias para a conservação dessas sementes durante o armazenamento consistem na desidratação parcial, na adição de ácido abscísico, no uso de solução de polietileno glicol e de baixas temperaturas. Contudo, tais condições ainda podem conduzir à deterioração, tanto pela atividade do seu próprio metabolismo, como pelo desenvolvimento de micro-organismos favorecidos pela umidade. Desta forma, o presente trabalho teve como objetivo analisar o grau de interferência dos fungos no metabolismo respiratório dos embriões de Inga vera com diferentes níveis de hidratação e a eficiência do tratamento com fungicidas, visando à manutenção da viabilidade durante o armazenamento. Para tanto, os embriões foram obtidos em três anos, sendo em 2009 colhidos em duas fases distintas de maturação (imaturos e maduros), submetidos a dois níveis de secagem, tratados ou não com carboxin + thiram e armazenados sob 7 e 25 oC por até 65 dias. Em 2010, foram colhidos maduros, submetidos a quatro níveis de secagem, tratados ou não com carbendazin + thiram e armazenados a 7 ºC por 120 dias. Nos experimentos de avaliação da respiração, os embriões obtidos em 2010 foram tratados ou não com carbendazin + thiram, mortos ou não por congelamento e inoculados ou não com Aspergillus flavus. Os colhidos em 2011 foram mantidos sem secagem e tratados ou não com carbendazin + thiram e a respiração foi avaliada a 7 e a 25 ºC. Constatou-se que a incidência de fungos, principalmente Fusarium oxysporum, juntamente com o teor de água e a temperatura influenciam nas taxas respiratórias dos embriões de I. vera maduros e que o tratamento com carbendazin + thiram, na dose de 80 mL do produto comercial para 100 kg de embriões, é eficiente na manutenção da viabilidade de embriões maduros e sem secagem, a 7 ºC por 120 dias. Pestalotiopis sp., Phoma sp., Phomopsis diachenii e Colletotrichum gloeosporioides aparecem durante o armazenamento, simultaneamente à deterioração dos embriões de I. vera. O desenvolvimento de fungos em embriões de I. vera difere do padrão clássico definido com base em sementes ortodoxas
Abstract: The high metabolism hinders the maintenance of Inga vera seeds viability. The main strategies for the conservation of these seeds during storage consist of the partial dehydration, addition of abscisic acid, use of polietileno glicol solution and of low temperatures. However, such storage conditions can lead to further deterioration of the seed, either by the activity of its own metabolism, as the development of microorganisms favored by moisture. This study aimed to analyze the degree of interference of fungi on the respiratory metabolism of Inga vera embryos with different levels of hydration and the efficiency of fungicide treatment, as maintaining these embryos viability during storage. The embryos were obtained in three years. In 2009 they were collected in two distinct stages of maturation (immature and mature), subjected to two drying levels, treated or not treated with carboxin + thiram and stored at 7 and 25 º C for up to 65 days. In 2010 the embryos were collected mature, subjected to four drying levels, treated or not treated with carbendazin + thiram and stored at 7 º C for 120 days. In the experiments carried out to evaluate the respiration, the embryos obtained in 2010, were treated or not treated with carbendazin + thiram, killed or not by freezing and inoculated or not with Aspergillus flavus. The embryos collected in 2011 were kept without drying, treated or not treated with carbendazin + thiram and respiration was evaluated at 7 and 25 ° C. It was found that the incidence of fungi, primarily Fusarium oxysporum, together with the water content and temperature influence respiration rates of mature embryos of I. vera and that the treatment with carbendazin + thiram at the dose of 80 mL of the commercial product to 100 kg of embryos is effective for maintaining the viability of mature embryos without drying at 7 ° C for 120 days. Pestalotiopis sp., Phoma sp., Phomopsis diachenii and Colletotrichum gloeosporioides are detected during the storage time, along with the deterioration of the embryos of I. vera. The development of fungi on embryos of I. vera differs from the classic pattern verified for orthodox seeds
Doutorado
Tecnologia Pós-Colheita
Doutor em Engenharia Agrícola
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De, Resende Ricardo CapuÌcio. "Design of a novel punch planter capable of producing equidistant seed spacing of irregular shaped seeds." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269519.
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Franke, JanaLynn. "Identification of the Infection Route of a Fusarium Seed Pathogen into Non-Dormant Bromus tectorum Seeds." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4318.
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The genus Fusarium has a wide host range and causes many different forms of plant disease. These include seed rot and seedling blight diseases of cultivated plants. The Fusarium-caused diseases of wild plants are less well-known. In this study we examined Fusarium sp. n-caused disease development on non-dormant seeds of the important rangeland weed Bromus tectorum as part of broader studies of the phenomenon of stand failure or ‘die-off’ in this annual grass. We previously isolated an undescribed species in the Fusarium tricinctum species complex from die-off soils and showed that it is pathogenic on seeds. It can cause high mortality of non-dormant B. tectorum seeds, especially under conditions of water stress, but rarely attacks dormant seeds. In this study, we used scanning electron microscopy (SEM) to investigate the mode of attack used by this pathogen. Non-dormant B. tectorum seeds (i.e., florets containing caryopses) were inoculated with isolate Skull C1 macroconidia. Seeds were then exposed to water stress conditions (-1.5MPa) for 7 d, then transferred to free water. Time lapse SEM photographs of healthy vs. infected seeds revealed that hyphae under water stress conditions grew toward and culminated their attack at the abscission layer of the floret attachment scar. A prominent infection cushion, apparent macroscopically as a white tuft of mycelium at the radicle end of the seed, developed within 48 hours after inoculation. Seeds which lacked an infection cushion completed germination upon transfer to free water, whereas seeds with an infection cushion were almost always killed. In addition, hyphae on seeds that did not initiate germination lacked directional growth and did not develop the infection cushion. This strongly suggests that the fungal attack is triggered by seed exudates released through the floret attachment scar at the initiation of germination. Images of cross-sections of infected seeds showed that the fungal hyphae first penetrated the caryposis wall, then entered the embryo, and later ramified throughout the endosperm, completely destroying the seed.
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FORTI, CHIARA. "Seeds in the context of agricultural research: combining traditional and innovative approaches to boost seed quality." Doctoral thesis, Università degli studi di Pavia, 2020. http://hdl.handle.net/11571/1301946.
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One of the challenges of the last few years is to provide conditions allowing to feed the overgrowing world population while also taking into consideration land availability and the global climate change. In this PhD thesis, different methods have been developed, useful to promote a sustainable agriculture. The experimental work focuses mainly on aspects related to Seed Technology, particularly the development of improved seed priming protocols, combined with the use of novel molecular hallmarks for seed germination. Besides this, efforts were also dedicated to develop genetic engineering methods useful to improve the complex trait of seed vigor, as a step to support both basic and translational research.
Seed germination is a critical parameter for the successful development of sustainable agricultural practices. While germination is impaired by environmental constraints related to the climate change scenario, priming is a pre-sowing technique that promote germination and seedling robustness by managing a series of crucial parameters during seed imbibition. In particular, it enhances the antioxidant/DNA repair activities triggered during the pre-germinative metabolism. A hydropriming protocol was developed for Solanum melongena L. and its crop wild relatives Solanum torvum Swartz and Solanum villosum Miller, and for the first time the molecular dynamics of pre-germinative metabolism were explored in primed seeds. In a parallel work, hydropriming and biopriming have been applied to Medicago truncatula seeds to enhance germination on contaminated soil. Phenotypic parameters were monitored and compared to find the most appropriate treatment combinations. The expression profiles of specific genes were used as molecular indicators of seed quality, to investigate seedling fitness under the imposed treatments.
Although genetic transformation has enabled fundamental insights into plant biology, unfortunately for most crops transformation and regeneration remain arduous. Genome editing techniques are an innovative and powerful strategy to introduce mutations or insert/substitute wide portion of DNA at a targeted site. These techniques have extremely important implications for agriculture and environment. Genome editing provides novel opportunities to enhance crop productivity if accompanied by an efficient transformation protocol. In this work, a novel vector for genome editing able to target the Tdp1β gene (tyrosyl-DNA phosphodiesterase 1β) in M. truncatula was developed.
Aside being a cereal model plant, Oryza sativa is one of the worlds most important crops and a major staple food that feeds more than three billion people worldwide. Rice cultivation in Europe is restricted to a few southern countries, Italy is the major producer in terms of quantity and varieties. Some elite cultivars, such as Vialone Nano for example, are recalcitrant to genetic transformation are local varieties (from Lombardy and Veneto) very appreciated at a culinary level but they suffer severe susceptibility to diseases and/or pathogens. To safeguard this variety, an efficient genetic transformation protocol has been hereby developed, as an essential step for the targeted improvement of relevant agronomic traits.