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Dissertations / Theses on the topic 'Crop species'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Wilson, Susan Ann. "Response to SO2 exposure of crop species and important eucalyptus species in Australia." Thesis, Wilson, Susan Ann (1993) Response to SO2 exposure of crop species and important eucalyptus species in Australia. PhD thesis, Murdoch University, 1993. https://researchrepository.murdoch.edu.au/id/eprint/52515/.

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The primary objective of this research was to investigate the impact of long-term exposure to SO2 on the growth and yield of major agricultural plant species and commercially important forest Eucalyptus species grown under Mediterranean climatic conditions in Australia; thereby providing the scientific criteria necessary for the development of air quality standards for sulphur dioxide (SO2) in Australia. There has been very little research on the response to SO2 of plants which grow in dry or Mediterranean climates; to date Australia has largely relied on overseas data to predict the impact of

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2

Fletcher, Penny Hazel. "The pollination of four wild plants species in crop fields." Thesis, University of Reading, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533764.

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3

Badakshi, Farah. "Genomes in the evolution of polyploid crop species and hybrids." Thesis, University of Leicester, 2014. http://hdl.handle.net/2381/29061.

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Many of the world’s crop species are recent polyploids. The various genomes from the diploid ancestors (known or, often, unknown) interact, with variable effects on genome packaging and nuclear organization (together the nuclear architecture), chromosome stability and gene expression. This project used a comparative approach to understand the genome composition in polyploids, focusing on millets in the Panicum group, saffron Crocus, Brassica and Nicotiana. In situ hybridization using DNA probes was used to identify the chromosomes and antibodies to synaptonemal complex, DNA repair and chromati

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4

Konkle, Samantha N. "Status of Amaranthus Species in Ohio Crop Production." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437400544.

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5

Sayyari, Zahan Mohammad Hassan. "Manganese efficiency and manganese uptake kinetics of different crop species." Göttingen Cuvillier, 2008. http://d-nb.info/991005724/04.

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6

Grindlay, Douglas J. C. "Principles governing the ability of cover crop species to trap nitrate." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294723.

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7

Sigdel, Sailesh. "Seeding Time and Interseeded Cover Crop Species Influence Sugarbeet Yield and Quality." Thesis, North Dakota State University, 2020. https://hdl.handle.net/10365/31884.

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Field experiments were conducted to evaluate cover crop interseeding time and species effect on sugarbeet production during 2018 and 2019 growing seasons. Cover crops were first interseeded in June and second interseeding was done in late June or early July. Four cover crops species, Austrian pea (Pisum sativum L.), winter rye (Secale cereale L.), winter camelina [Camelina sativa (L.) Crantz], and brown mustard (Brassica juncea L.), were examined. First interseeding resulted in significantly higher cover crop biomass than second interseeding. In 2018, the highest recoverable sugar yield was ob

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8

Wesheu, Irene Catherine. "Species richness - standing crop relationships on an infertile shoreline in Nova Scotia." Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5200.

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9

Persson, Helena. "Estimating genetic variability in horticultural crop species at different stages of domestication /." Alnarp : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5838-2.pdf.

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10

D'Utra, Vaz Fernando Berlinck. "Somatic and sexual hybridization in tropical fruit crop species passionfruit and tomato." Thesis, University of Nottingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334766.

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11

Fedkenheuer, Michael Gerald. "Understanding Plant Pathosystems in Wild Relatives of Cultivated Crop Plants." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/81976.

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As the global population rises, the demand for food increases which underscores a need for improvement in food security. Disease pressures are a major concern surrounding sustainable agriculture. Static crop populations, containing little to no genetic diversity, are vulnerable to diverse pathogen populations. Wild relatives of crop plants are a reservoir for new disease resistance traits that can be introgressed into cultivated crops. The identification of novel disease resistance is of paramount importance because pathogen co-evolution is not only defeating current resistance genes (R

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12

Chai, Hui Hui. "Developing new approaches for transcriptomics and genomics : using major resources developed in model species for research in crop species." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14246/.

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With the estimated increase in global demand for food and over-reliance on staple food crops, the exploitation of agricultural biodiversity is important to address food security challenges. The aim of this study is to develop approaches to transfer major informational and physical resources developed in model plant and major crop species to resources poor crop species, using oil palm and Bambara groundnut as two exemplar crops. XSpecies (cross-species) approach, the core approach of the study, is described as the approach which uses microarrays developed for a given species to analyse another

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13

Barteri, Fabio. "Impact of transposition on the generation of genetic variability in Prunus crop species." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/669550.

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ls Elements transposables (ETs) són unitats genètiques mòbils aptes a canviar la seva posició en el genoma i difondre autònomament. En els eucariotes, els ETs constitueixen una part considerable del DNA genòmic. Diversos estudis relacionen la seva difusió al creixement de la mesura i de la variabilitat genètica dels genomes eucariotes. No obstant això, el abast de l’impacte d’aquests elements sobre l’estructura i funció del genoma deixa moltes preguntes sense resposta. Malgrat el gran desenvolupament de camps com la genòmica i l’anàlisi computacional de dades massius, encara cal un esforç en e

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14

Alkadri, Dima <1979&gt. "Fusarium species responsible for mycotoxin production in wheat crop: involvement in food safety." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4884/1/Alkadri_Dima_tesi.pdf.

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Fusarium Head Blight (FHB) is a worldwide cereal disease responsible of significant yield reduction, inferior grain quality, and mycotoxin accumulation. Fusarium graminearum and F. culmorum are the prevalent causal agents. FHB has been endemic in Italy since 1995, while there are no records about its presence in Syria. Forty-eight and forty-six wheat kernel samples were collected from different localities and analyzed for fungal presence and mycotoxin contamination. Fusarium strains were identified morphologically but the molecular confirmation was performed only for some species. Further diff

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Alkadri, Dima <1979&gt. "Fusarium species responsible for mycotoxin production in wheat crop: involvement in food safety." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4884/.

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Fusarium Head Blight (FHB) is a worldwide cereal disease responsible of significant yield reduction, inferior grain quality, and mycotoxin accumulation. Fusarium graminearum and F. culmorum are the prevalent causal agents. FHB has been endemic in Italy since 1995, while there are no records about its presence in Syria. Forty-eight and forty-six wheat kernel samples were collected from different localities and analyzed for fungal presence and mycotoxin contamination. Fusarium strains were identified morphologically but the molecular confirmation was performed only for some species. Further diff

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16

Gathumbi, Stanley Mwangi. "Nitrogen sourcing by fast-growing legumes in pure and mixed species fallows in western Kenya." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322531.

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17

Jacobs, Addison Denae. "Influence of Cover Crop Species on Soil Physical Properties in a Corn-soybean Rotation." Thesis, Arkansas State University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10831039.

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<p> As crop land decreases and population increases, soil quality is becoming a concern. Utilizing cover crops in cropping systems could improve soil quality. This study examined 16 treatments of single-species cover crops, cover crop mixes, and two control treatments on a silt-loam soil, in a corn (<i> Zea mays</i> L.) - soybean (<i>Glycine max</i> L. <i> Merr</i>.) crop rotation under no-tillage, to determine their effect on soil physical properties. Cover crop biomass differed (p<0.10) among treatments and produced a maximum of 15.6 Mg ha<sup>-1</sup> of biomass in the crimson clover tre

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18

Al-shallash, Khalid S. "Studies on the biology and control of weedy species of Lolium (annual rye-grasses)." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261517.

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19

Davis, Cathryn Joyce. "Cover crops for soil health and forage." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/34537.

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Master of Science<br>Department of Agronomy<br>DeAnn R. Presley<br>Cover crops have numerous benefits and while cover crops have been used for centuries, currently there are few producers in Kansas growing them and so there is a need for additional research on how cover crops affect soil properties, and on the potential for utilizing cover crops as forage. Two studies are presented in this thesis. The first study evaluated the use of cover crops in a vegetable production system as compared to a fully tilled control. This study evaluated soil physical properties in the form of wet aggregate st

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20

Guretzki, Sebastian [Verfasser]. "Development of plant species and ecotypes tolerant to drought stress as crop plants / Sebastian Guretzki." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2014. http://d-nb.info/1053414587/34.

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21

Cantamutto, Sanchez Miguel Angel. "Agronomic study of two annual helianthus species naturalized in Argentina as potential sunflower crop genetic resource." Doctoral thesis, Universitat de Lleida, 2008. http://hdl.handle.net/10803/8341.

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El gènere Helianthus (Asteraceae), nadiu d'Amèrica del Nord, compren no només el<br/>girasol conreuat H. annuus var. Macrocarpus L., sinó també d'altres espècies que són<br/>invasores. El gira-sol silvestre H. annuus ssp. Annuus L. i H. petiloaris Nutt. Són dues<br/>espècies anuals naturalitzades en la part central d'Argentina. Ambdues resulten<br/>d'interès com a recurs fitogenètic.<br/>L'H. annuus silvestre fou probablement introduït per a ús farratger mentre que sembla<br/>que l'H. petiolaris ingressà com a contaminant de llavors. S'estudiaren les condicions<br/>ambientals i ecològiques del

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22

Gilroy, Eleanor Marjorie. "Utilising model systems and crop species to discover and characterise novel genes in plant disease resistance." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/13910.

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This project was a collaboration between groups within the <i>Arabidopsis</i> research community and the crop-based research community through which the best resources of both could be utilised to study aspects of resistance to biotrophic pathogens. An objective was to work towards transferring information between models and crop plant. Activation tagged Arabidopsis lines were screened for disease susceptibility to <i>Pseudomonas</i> <i>syringae</i> pv <i>tomato</i> (DC3000). Two mutant lines, named activated disease susceptibility (ads), were confirmed to be susceptible and candidate gene(s)

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23

Peterson, Kendra Leigh. "Effects of humic acids and soil symbionts on growth, physiology, and productivity of two crop species." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami1501187076919492.

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24

Vargas, Rojas Bladimir. "Agronomical evaluation of six species of forage grass tolerant to salinity in the Tamborada region." BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/5448.

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Six forage grass species from the United States were evaluated for salinity tolerance and growth performance. A randomized block design was used with six repetitions of five furrows each to maintain experimental consistency. The study was conducted in the Tamborada region of Cochabamba, Bolivia from December 2003 through June 2004. Results indicated that significant differences exist between species (Pr<0.01). The species Elymus cinereus and Agropyron elongatum demonstrated the best performance regarding plant height, achieving heights of 35.4 cm and 32.7 cm respectively. Festuca arundinacea a

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25

Kuykendall, Matti Beth. "Biomass production and changes in soil water with cover crop species and mixtures following no-till winter wheat." Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19080.

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Master of Science<br>Department of Agronomy<br>P. V. Vara Prasad,<br>Kraig L. Roozeboom<br>Replacing fallow with cover crops can provide many benefits, including improved soil quality and reduced nitrogen fertilizer requirements. The addition of cover crops into no-till systems has become popular in recent years as a means of increasing cropping system intensity and diversity. A primary concern of producers in the Great Plains is the possibility that cover crops may reduce the amount of soil water stored in the profile for the next grain crop, potentially reducing yields. Multi-species cover c

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26

Lee, David Jackson. "Population Dynamics of Rhizoctonia Species in Tall Fescue and Creeping Bentgrass in Response to Disease Management Programs." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-07122004-140248/.

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<I>Rhizoctonia</I> species are important pathogens of all turfgrasses, yet little is known about the structure of populations of these pathogens or the effect of disease control programs on population dynamics. Isolates of <I>Rhizoctonia</I> were obtained from a single creeping bentgrass putting green in 2002 and 2003 and from multiple tall fescue landscapes in 2003. Creeping bentgrass isolates were obtained by placing 5 mm soil cores on alkaline water agar, incubated at ~24 C for 1 to 2 days and the actively growing hyphae were transferred to potato dextrose agar (PDA). Tall fescue isolates w

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27

Ma, Li. "Ecophysiology of the effect of red to far-red light ratio on selected weed and crop species." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63174.

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Plants growing in canopies are exposed to reduced light intensity as well as low red/far-red light ratios, a signal of impending competition. In order to advance our understanding of the eco-physiological role of red/far-red ratio in agroecosystems, growth chamber and greenhouse studies were conducted to investigate 1. the growth and morphological responses of common lamb’s-quarters (Chenopodium album L.), redroot pigweed (Amaranthus retroflexus L.) and tomato (Solanum lycopersicum L.) to different red/far-red ratios, 2. how leaf optical properties at red (660 nm) and far-red (730 nm) waveleng

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28

Šišić, Adnan [Verfasser]. "Evaluation of Pathological Risks Associated with Use of Leguminous Cover crop and Living mulch species / Adnan Šišić." Kassel : Universitätsbibliothek Kassel, 2017. http://d-nb.info/1174700572/34.

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29

Sherriff, C. "Physiologic specialization of the downy mildew fungus, Peronospora parasitica (Pers. Ex. Fr.)Fr., on Brassica crop species." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373340.

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30

Knight, Patricia Heather Radcliffe. "Factors affecting the uptake and activity of foliage-applied diflufenican in a selected crop and weed species." Thesis, University of Strathclyde, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291992.

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31

Whitacre, Marina K. "Cattle as Grazing Management and Seed Dispersal Tools for Increasing Native Species Diversity on Great Basin Rangelands." DigitalCommons@USU, 2004. https://digitalcommons.usu.edu/etd/6604.

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A series of experiments evaluated: 1) the influence of seed intake and gut retention time on seed passage , recovery , and germinability; 2) fecal seeding and broadcast /trampling as techniques to incorporate seeds into a well-established Agropyron desertorum (Fisch.) Schult. stand in Skull Valley , Utah; 3) intensive grazing as a means to reduce Agropyron biomass and increase establishment and survival of seeded species; and 4) the recovery and germinability of seed extracted from dung collected from the field. Two shrubs (Artemisia tridentata Nutt. ssp. wyomingensis Beetle & Young and Atripl

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Leeks, C. R. F. "Determining seed vigour in selected Brassica species." Lincoln University, 2006. http://hdl.handle.net/10182/1274.

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Variables for the accelerated ageing (AA) test, methods for reducing fungal contamination during the AA test, using the conductivity test as a vigour test, the effect of seed size on seed vigour and the relationship between laboratory test results and field perfonnance in selected Brassica spp were investigated. In the first experiment, three seed lots of turnip rape hybrid (B. rapa x campestris), turnip (B. campestris) and forage rape (B. napus); and seven seed lots of Asian rape (B. napus), six seed lots of Asian kale (B. oleraceae var. alboglabra L.) and five seed lots of choisum (B. rapa v

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33

Bramley, Helen. "Water flow in the roots of three crop species : the influence of root structure, aquaporin activity and waterlogging." University of Western Australia. School of Plant Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0102.

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[Truncated abstract] The hydraulic properties of the roots of three crop species important to Western Australia were examined: wheat (Triticum aestivum), narrow-leafed lupin (Lupinus angustifolius) and yellow lupin (L. luteus). Generally, the hydraulic conductivity (Lpr) of root systems differs between species and can change in response to adverse conditions. To determine the significance of root anatomy and aquaporin activity on the pathway of water flow through roots, water flow was measured across cell membranes, individual roots and whole root systems. The combination of measurements ident

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34

陳堅峰 and Kin-fung Chan. "Phylogenetic relationships and genetic diversity detected by rapd and isozyme analysis of crop and weedy species of amaranthus." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B29803846.

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35

Chan, Kin-fung. "Phylogenetic relationships and genetic diversity detected by rapd and isozyme analysis of crop and weedy species of amaranthus /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17665450.

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36

Kale, Manoj Ashokrao. "Bird Species in Urban and Agricultural Landscapes : Bird diversity patterns along an urbanisation gradient and crop damage caused by birds on the Deccan Plateau, India." Doctoral thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-154421.

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The major human activities that have transformed the Earth include agriculture and urbanization. The present study was conducted to contribute to a description of the effect on birds of urbanization and agriculture in an Indian region. Terrestrial bird assemblages were censused along a five-stage urbanisation gradient between January and April 2010-2013 near the city of Amravati, on the Deccan Plateau, Central India. Altogether, 89 species of birds were recorded, with the highest species richness in the rural areas (67 species) and lowest in the urban stage (29 species). The assemblages were s

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37

Cooney, Jackson. "The Effect of Bat Predation on Crop Yield in Thailand and the Winter Garden Region of South-Central Texas." Scholarship @ Claremont, 2018. http://scholarship.claremont.edu/cmc_theses/1727.

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The Wrinkle-lipped free-tailed bat (T. plicata) in Thailand and the Brazilian free-tailed bat (T. brasiliensis) in south-central Texas are integral in the control of agricultural pests. The effect on the production of rice and cotton is determined by the bats consumption of a particular pest species in that region. In Thailand, it is the White-Backed Planthopper (Sogatella furcifera), while in south-central Texas, it is the cotton bollworm (Helicoverpa zea). The ecological service these bat species provide is measured in millions of dollars saved by farmers each year. Finally, a conclusion was

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38

Heineman, Arne M. "Species selection for alley cropping in Western Kenya : system management, nutrient use efficiency and tree-crop compatibility (1988-1995)." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318545.

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39

Benefer, Carly Marie. "The molecular and behavioural ecology of click beetles (Coleoptera: Elateridae) in agricultural land." Thesis, University of Plymouth, 2011. http://hdl.handle.net/10026.1/485.

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The larvae (wireworms) of some click beetle genera inhabit the soil in agricultural land and are crop pests. In the UK, a pest complex of Agriotes species, A. obscurus, A. sputator and A. lineatus, has been identified as the cause of the majority of damage. However, studies on their ecology are lacking, despite knowledge of this being important for the development of sustainable risk assessment and pest management strategies, in part due to the morphologically cryptic nature of wireworms. The ecology of economically important click beetle species was investigated, focusing on UK Agriotes speci

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40

Paye, Paye Freddy Óscar. "Agronomic evaluation and comparison of the yield of six multiannual forage species, under dry land conditions in the Ingavi province." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/5419.

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The agronomical evaluation and the comparative work of six multiannual forage species was conducted in the facilities of the Benson Institute, in the community of Contorno de Letanias, Ingavi province, La Paz. The objectives were to evaluate the agronomic behavior, as well as to evaluate the dry matter (DM) yield of six multiannual forage species (grasses) under local conditions, and to determine the partial cost of production of the studied species. The annual mean temperature was 9.14°C, and 517.6 mm of precipitation. The test was conducted under the random block design test, with six differ

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Czyzewicz, Nathan. "Functional characterisation of small signalling peptides and a receptor kinase involved in root architecture development in Arabidopsis and crop species." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/41776/.

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Post-embryonic root development is a plastic process by which plants are able to interface with the rhizosphere in order to provide anchorage, and increase surface area available for acquisition of nutrients and water. While root growth is governed primarily by auxin/cytokinin interactions, roots are able to sense the presence of surrounding nutrient deposits and changes to environmental conditions – directing growth accordingly – due to the action of signalling cascades. This thesis presents data pertaining to the characterisation of two signalling elements involved in governing root architec

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LAKIN, KENNETH RYAN. "SYSTEMATICS AND BIOLOGY OF THE CROP ASSOCIATED SPECIES OF POLYNEMA (HYMENOPTERA: MYMARIDAE) IN SOUTHERN ARIZONA (PARASITOIDS, PARASITE, ALFALFA HOPPERS, LEAFHOPPERS)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188052.

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Egg parasitoid wasps of the genus Polynema (Hymenoptera: Mymaridae) were collected over a 4-year period from crop-associated areas in southern Arizona. Seven morphologically distinct species were collected with 3 species identified. Evidence was found for the existence of an additional sibling species. Taxonomic characters currently used for this genus were evaluated for stability when the parasitoids develop in alternate hosts and some were found to be unreliable. A key to the Polynema species from Arizona were composed utilizing new characters. Biological studies were carried out on 5 of the

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Curran, Helen R. (Helen Rae). "Thecaphora anther-smut fungi : ecology and implications for CFR Oxalis species." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20293.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Only a limited number of systems involving anther-smut fungi have been studied, usually due to the economic significance of their crop plant hosts. A smut fungus of the genus Thecaphora has been discovered infecting Oxalis hosts in South Africa. This pathogenic fungus, Thecaphora capensis, produces dark-coloured spores in the anthers of host flowers, rendering it an anther-smut fungus. The host genus is the seventh largest plant genus in the Cape Floristic Region (CFR) and the largest geophytic genus of this region. Nine Oxalis

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Musunda, Bothwell Zvidzai. "Evaluation of cover crop species for biomass production, weed suppression and maize yields under irrigation in the Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/347.

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Achieving high biomass yields of cover crops has been a challenge to the success of Conservation Agriculture (CA) practices in the Eastern Cape (EC). A study was conducted to evaluate strategies for optimizing cover crop biomass production. Trials were carried out to screen summer and winter cover crops, as well as evaluate intercropping patterns and planting dates for biomass, weed suppression and subsequent maize yield under irrigation. Four summer legume cover crop species were evaluated under a Randomised Complete Block Design (RCBD) design. The cover crops were fertilized with 13.34 kg ha

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Nambili, Julia Nghituvali. "The interference potential of nine selected South African spring wheat cultivars with selected weed species." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019.1/1631.

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46

Brown, Angela Philip. "Pollen, embryo and endosperm development following cross-pollination within and between the crop species Brassica campestris, Brassica oleracea, Brassica napus and Raphanus sativus." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/12858.

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47

Hamilton, Kim Nicole. "Ex Situ Conservation of Australian Citrus Species: Investigations on Seed Biology, Cryopreservation and in Vitro Culture." Thesis, Griffith University, 2007. http://hdl.handle.net/10072/365585.

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Many potentially economically important taxa of Australia are threatened in situ and are vulnerable to erosion of genetic diversity and extinction. In this study, over one hundred rare and threatened Queensland edible plants and/or crop wild relatives were identified. Many of these species have subtropical to tropical distribution and may have non-orthodox seed storage behaviour, thus excluding standard seed banking approaches for long-term ex situ conservation. There is an urgent need to develop alternative ex situ conservation strategies to conserve this diversity. Establishment of ex-situ

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Leveau, Aymeric. "Caractérisation structurale de l'éliciteur du virus X de la pomme de terre (PVX) : recherche, chez les plantes cultivées, de gènes hôtes, impliqués dans la résistance liée à Rx." Thesis, Evry-Val d'Essonne, 2012. http://www.theses.fr/2012EVRY0036.

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De nos jours, les agents pathogènes des plantes, engendrent encore des pertes agricoles importantes. A terme, la solution la plus adaptée semble être la création de variétés de plantes cultivées présentant une résistance génétique à large spectre et durable. Créer de telles plantes nécessite la compréhension des mécanismes de résistance mis en jeu dans des pathosystèmes modèles, tels que celui impliquant le gène de résistance Rx et le virus X de la pomme de terre. Dans ce système, la protéine Rx intervient dans la perception d’un facteur d'avirulence issu du virus: sa protéine de capside (Cp).

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Rogers, Gordon Stephen, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty, and School of Horticulture. "Influence of N and P nutrition on the responses of wheat and cotton to elevated CO2." THESIS_FSTA_HOR_Rogers_G.xml, 1996. http://handle.uws.edu.au:8081/1959.7/227.

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The atmospheric CO2 concentration is rising. These higher CO2 concentrations will certainly affect growth but may also affect nutrient responses of crop plants. The overall aim of this thesis was to investigate the effect of elevated CO2 on the nitrogen and phosphorus nutrition of two different crop species: wheat and cotton. Once establishing the new nutrient requirements of these crop species at elevated CO2 the study focussed on the interactive effects of elevated CO2 and N supply on growth and leaf N concentrations in cotton and wheat, carbohydrate metabolism, source:sink interactions and

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Payne, Kathryn Marie. "ENHANCED EFFICIENCY NITROGEN FORMULATION EFFECT ON GRASS-LEGUME PASTURE PRODUCTIVITY." UKnowledge, 2019. https://uknowledge.uky.edu/pss_etds/113.

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The use of nitrogen (N) fertilizer is generally restricted on mixed species forage systems due to its stimulatory effect on grasses which increases competition with legume species. Reduced legume growth from this competition can compromise forage nutritive value and prospective yields. The controlled-release nature of several enhanced efficiency fertilizer N products holds the potential to improve legume persistence in mixed species pastures while providing supplemental N required by the grass component. The studies contained in this dissertation evaluated the effect of different enhanced effi

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