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Dissertations / Theses on the topic 'Seedling resistance'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Morse, Stephen. "The role of hydroxamic acids in conferring resistance to aphid pests of seedling maize (Zea mays)." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293605.

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2

Lorentz, Andrew. "Design, construction and testing of an ascending micropenetrometer to measure soil crust resistance." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/8511.

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The increasing world population is putting pressure on global food production. Agriculture must meet these growing demands by increasing crop yields. One phenomenon which prevents seedling emergence and damages crop yield is soil crusting. Understanding of soil crusting and the factors which influence it is fundamental to ensuring good crop production. An instrument which will test soil crust strength in a novel way, mimicking seedling growth, may lead to pre-emptive agricultural soil management which could increase crop production. This work details the process of design, construction and tes

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3

Malligan, Cassandra D. "Crown rot (fusarium pseudograminearum) symptom development and pathogen spread in wheat genotypes with varying disease resistance." University of Southern Queensland, Faculty of Sciences, 2009. http://eprints.usq.edu.au/archive/00006225/.

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[Abstract]Crown rot, caused by Fusarium pseudograminearum (Fpg), is an important soilborne disease of wheat and barley. The degree of crop damage depends on seasonal conditions. Typically, high moisture conditions early in the season encourage seedling infection from stubble residues. Moisture stress later in the season leads to the production of unfilled “whiteheads”. Current control relies on cultural practices and sowing of partially resistant varieties. In order to understand the nature of partial resistance, I have examined the patterns of disease symptom development and pathogen spread i

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4

Sandhu, Karanjeet Singh. "Genetic and molecular analyses of barley for seedling and adult plant resistance against rust diseases." Thesis, The University of Sydney, 2011. http://hdl.handle.net/2123/8860.

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Genetic studies were carried out to determine the inheritance of unknown seedling resistance (USR) to leaf rust (caused by Puccinia hordei Otth.) in the barley cultivar Ricardo. In the greenhouse Ricardo/Gus F3 (187 lines) and BC1F2 (130 lines) populations based studies using an array of P. hordei pathotypes (pts), revealed that the USR in Ricardo was conferred by a single dominant gene, which was tentatively named RphRic. Bulk segregant analysis (BSA) of the F3 population using a multiplex-ready PCR technique mapped RphRic on chromosome 4H flanked by markers GBM1220 and GBM1003 at distances o

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5

Dugo, Tesfaye Letta <1976&gt. "Association mapping of stem rust resistance in durum wheat at the seedling and adult plant stages." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5935/1/Dugo_Tesfaye_tesi.pdf.

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In wheat, stem rust is known to rapidly evolve new virulence to resistance genes. While more than 50 stem rust resistance (Sr) loci have been identified in wheat, only a few remain effective, particularly against the highly virulent race Ug99 (TTKSK race) and a mixture of durum-specific races. An association mapping (AM) study based on 183 durum wheat accessions was utilized to identify resistance loci for stem rust response in Ethiopia over four seasons and artificial inoculation with Ug99 (TTKSK race) and a mixture of durum-specific races under field conditions as well as in greenhouse test

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6

Dugo, Tesfaye Letta <1976&gt. "Association mapping of stem rust resistance in durum wheat at the seedling and adult plant stages." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5935/.

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In wheat, stem rust is known to rapidly evolve new virulence to resistance genes. While more than 50 stem rust resistance (Sr) loci have been identified in wheat, only a few remain effective, particularly against the highly virulent race Ug99 (TTKSK race) and a mixture of durum-specific races. An association mapping (AM) study based on 183 durum wheat accessions was utilized to identify resistance loci for stem rust response in Ethiopia over four seasons and artificial inoculation with Ug99 (TTKSK race) and a mixture of durum-specific races under field conditions as well as in greenhouse test

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7

Pogoda, Maria [Verfasser], Jochen C. [Gutachter] Reif, and Ralph [Gutachter] Panstruga. "Identification and validation of seedling powdery mildew resistance genes / Maria Pogoda ; Gutachter: Jochen C. Reif, Ralph Panstruga." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2019. http://d-nb.info/1210730200/34.

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8

Ellis, Margaret Lee. "The Soybean Seedling Disease Complex: Pythium spp. and Fusarium graminearum and their Management through Host Resistance." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322495401.

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9

Weerasooriya, Dilooshi Kumari. "Genetic analysis of interveinal chlorosis and reduced seedling vigor as related to agronomic performance in sorghum resistant to ALS inhibitor herbicides." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32896.

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Doctor of Philosophy<br>Department of Agronomy<br>Tesfaye T. Tesso<br>The lack of effective post-emergence weed control options is often highlighted as one of the major factors behind dwindling acreage under sorghum (Sorghum bicolor (L.) Moench) in the United States. The discovery of herbicide resistance sources in wild sorghum population and subsequent efforts to incorporate them into cultivated sorghum was received with much optimism to change weed management practices in sorghum. As the development of the technology advances, especially of the Acetolactate synthase (ALS) resistance, concern

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10

Kalia, Bhanu. "Mining the Aegilops tauschii gene pool: evaluation, introgression and molecular characterization of adult plant resistance to leaf rust and seedling resistance to tan spot in synthetic hexaploid wheat." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18934.

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Doctor of Philosophy<br>Genetics Interdepartmental Program<br>Bikram S. Gill<br>Leaf rust, caused by fungus Puccinia triticina, is an important foliar disease of wheat worldwide. Breeding for race-nonspecific resistant cultivars is the best strategy to combat this disease. Aegilops tauschii, D genome donor of hexaploid wheat, has provided resistance to several pests and pathogens of wheat. To identify potentially new adult plant resistance (APR) genes, 371 geographically diverse Ae. tauschii accessions were evaluated in field with leaf rust (LR) composite culture of predominant races. Accessio

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11

Hatzig, Sarah Vanessa [Verfasser]. "Breeding for climate change : genetics and physiology of seed vigor, seedling vigor and early drought resistance in winter oilseed rape (Brassica napus L.) / Sarah Vanessa Hatzig." Gießen : Universitätsbibliothek, 2015. http://d-nb.info/108012019X/34.

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12

Collavo, Alberto. "Resistance to graminicides in monocotyledons weeds Case studies of Lolium spp. and Phalaris paradoxa in Italy." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3426375.

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Herbicide resistance is evolving fast in Italy, especially in cropping systems characterised by low diversity in space and time. In these systems there is often no rotation of herbicides mode of action (i.e. durum wheat and rice monoculture). Resistance is also evolving faster in cross-pollinating and genetically variable species (i.e. Lolium spp.). In Italy about 100,000 ha have been estimated to suffer resistant problems, mainly in durum wheat (Lolium spp., Avena sterilis and Papaver rhoeas) and paddy rice (mostly Schoenoplectus mucronatus and Cyperus difformis). ACCase is an essential enz

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13

Stewart, Alan V. "Plant breeding aspects of ryegrasses (Lolium sp.) infected with endophytic fungi." Phd thesis, University of Canterbury. Lincoln College, 1987. http://theses.lincoln.ac.nz/public/adt-NZLIU20071005.172250/.

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Some aspects of the presence of systemic endophytic fungi in agriculturally important New Zealand grasses were studied in relation to plant breeding. Seedling resistance to adult Argentine stem weevil feeding in perennial ryegrass, Italian ryegrass and tall fescue was found to be related to the presence of their respective Acremonium endophytes in the seed rather than to plant genetic resistance. In addition a study of perennial ryegrass revealed that this resistance was independent of endophyte viability. The seedling resistance conferred by the endophyte of Italian ryegrass was found to be b

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14

Schnaithmann, Florian [Verfasser], Klaus [Akademischer Betreuer] Pillen, and Gunter [Akademischer Betreuer] Backes. "Mapping of quantitative trait loci regulating nitrogen stress tolerance and leaf rust seedling resistance in two selected populations derived from crosses between exotic and elite barley : [kumulative Dissertation] / Florian Schnaithmann ; Klaus Pillen, Gunter Backes." Halle, 2016. http://d-nb.info/1116951517/34.

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15

Kännaste, Astrid. "Volatiles of Conifer Seedlings : Compositions and Resistance Markers." Doctoral thesis, KTH, Organisk kemi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4723.

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Pine weevils cause major damage to newly planted conifer seedlings in reforestation areas. However, recent findings indicate that small (“mini”) seedlings, planted at the age of 7-10 weeks, are gnawed less by pine weevils than the larger, conventionally planted seedlings. Thus, it has been proposed that planting young conifer seedlings in clear-cut areas may reduce the damage caused by pine weevils. In attempts to determine why mini seedlings appear to be less damaged by pine weevils than “conventional” seedlings, the volatiles released by Norway spruce and Scots pine mini seedlings were inves

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16

Kännaste, Astrid. "Volatiles of conifer seedlings, composition and resistance markers /." Stockholm : Kemi, Chemistry, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4723.

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17

Lehto, Tarja Helena. "Role of mycorrhizas in drought resistance of Sitka spruce seedlings." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/11045.

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18

Giffard, Brice. "Influence des interactions biotiques complexes sur la régénération des essences forestières feuillues." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14319/document.

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Les herbivores consomment les tissus végétaux et affectent la survie et la croissance des végétaux. Les ennemis naturels des herbivores peuvent réguler leurs populations et indirectement diminuer les dommages sur la végétation. Les relations entre plantes, herbivores et prédateurs sont liées aux caractéristiques intrinsèques des espèces végétales mais aussi influencées par la communauté végétale environnante. L'hypothèse de résistance par association stipule qu'une communauté végétale diversifiée entraîne une diminution des dégâts sur une plante cible par dilution, répulsion des herbivores et/

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19

Stattin, Eva. "Root freezing tolerance and storability of Scots pine and Norway spruce seedlings /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5639-8.pdf.

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20

Wen, Kui. "Down-regulation of defense gene transcripts of Rhizoctonia solani-infected bean seedlings in response to inoculation with non-pathogenic fungi." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80895.

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In this study, we have demonstrated that inoculation of bean seeds with non-pathogenic binucleate Rhizoctonia (np-BNR) at sowing protected bean seedlings from infection of R. solani. Using quantitative real-time RT-PCR (QRT-PCR), transcript levels of defense genes encoding 1,3-beta-glucanase (GLUC), phenylalanine ammonia-lyase (PAL), chalcone synthase (CHS) in one-week old bean seedlings was monitored during np-BNR and R. solani interaction. The results revealed that protection effect of np-BNR correspond to a systemic suppression of these three defense genes' expression from significan

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21

Das, Lopamudra. "Studies on tea seed mycoflora and resistance of young tea plants against Rhizoctonia solani, a soil born root pathogen of germinating tea seedlings." Thesis, University of North Bengal, 2013. http://hdl.handle.net/123456789/1539.

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22

Danusevicius, Darius. "Early genetic evaluation of growth rhythm and tolerance to frost in Picea abies (L.) Karst /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5637-1.pdf.

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23

Adomas, Aleksandra. "Transcript profiling of the Heterobasidion-conifer pathosystem : host and pathogen responses to biotic stress /." Uppsala : Dept. of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200735.pdf.

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24

Wessels, Andries Bernardus. "Genetic characterization and fungicide resistance profiles of Botrytis cinerea in rooibos nurseries and pear orchards in the Western Cape of South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20070.

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Thesis (MScAgric)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Botrytis cinerea Pers. Fr. [teleomorph Botryotinia fuckeliana (de Bary) Whetzel] causes serious losses of over 200 crops worldwide, including rooibos seedlings and pears. This pathogen is characterized by morphological, physiological and genetic diversity. The genetic diversity and population structure have not been investigated for B. cinerea populations in South Africa. Botrytis cinerea collected from rooibos seedlings and in pear orchards in the Western Cape of South Africa were investigated in the present study. T

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25

Guo, Kunmei. "Functional assessment of the role of cyclic nucleotide-gates channel (CNGC10) and salt overly sensitive (SOS1) antiporter in salinity tolerance in Arabidopsis." University of Western Australia. Faculty of Natural and Agricultural Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0063.

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Control of intracellular ion homeostasis is pivotal to plant salt tolerance. Plants have developed a number of mechanisms to keep ions at appropriate concentrations. Both transporters and channels on the plasma membrane play important roles in this function. Plant cyclic nucleotide-gated channels (CNGCs) in the plasma membrane are non-selective monovalent and divalent cation channels. So far, most studies on plant CNGCs have been conducted on heterologous systems. In planta, reverse genetic studies revealed the role of different CNGCs in cation uptake, transport and homeostasis. However, there

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26

Zabot, Lucio. "Caracterização agronômica de cultivares transgênicas de soja cultivadas no Rio Grande do Sul." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/3186.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Aiming to characterize the main transgenic soybeans cultivars used in Rio Grande do Sul, experiments were conducted during the 2007/2008 season, in Santa Maria/RS. In the field, the cultivars Relmo Anta RR 82, A 6001 RG, A 8000 RG, FUNDACEP 53 RR, FUNDACEP 54 RR, FUNDACEP 56 RR, BRS 244 RR, and CD 214 RR CD 219 RR, drilled at seeds rates of 250, 400 and 550 thousand seed ha-1 and at row spacing of 0.30, 0.45 and 0.60m. The variables were: grain yield, yield components, distribution of income in different strata of the plant, morpho

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27

Cowger, Christina. "Cephalosporium stripe of wheat : seedling-based resistance screening and pathogenic variability." Thesis, 1997. http://hdl.handle.net/1957/33687.

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Cephalosporium stripe of wheat (Triticum aestivum), caused by the soilborne fungus Cephalosporium gramineum, results in significant yield reductions in dryland winter wheat crops of the U.S. Pacific Northwest. The development of resistant cultivars offers the best hope for disease control. Breeding for resistance is hampered by the long trial times inherent in screening adult plants, and by cultivar x environment interactions in field tests. The principal objective of this research was to develop and test a procedure for screening wheat seedlings in controlled environments for resistance to Ce

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28

Junior, Adolar Freitag. "A "Pan American" approach to durable crown rust resistance in oats : evaluation of a seedling resistance covariance method /." Diss., 2010. http://purl.umn.edu/90938.

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29

Kennett, Raymond Matthew. "The Evaluation of High Tannin Cotton Lines for Resistance to Rhizoctonia solani and Pythium aphanidermatum." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7621.

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Cotton seedling disease complex is caused by a number of pathogens inducing similar symptoms and can lead to thin, uneven stands that grow slowly and yield poorly. Preliminary work indicated that a set of high tannin cotton lines developed and released in 1989 by Texas A&M AgriLife Research, (Smith et al., 1990a, Smith et al., 1990b, Schuster et al., 1990) may possess increased resistance to disease. This evidence, along with additional studies that show a clear role of tannin in disease resistance, suggest that these high tannin cotton lines may prove useful in breeding for increased resistan

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30

yueh-chi, Han, and 韓岳麒. "Resistance mechanism of rice seedlings to bentazon herbicide among rice lines." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/50617064785995792397.

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碩士<br>國立中興大學<br>農藝學系<br>88<br>Bentazon is usually used in weed control for rice and peanut crops. If the growth of rice, cv. TNG67, seedlings was affected and how the physiological response was influenced by bentazon, especially for the resistant- and the susceptible-lines among Japonica- and Indica-type rice, were investigated. According to the dose-response to bentazon of five growth characters including plant height, shoot fresh weight, total chlorophyll, chlorophyll a and chlorophyll b of TNG67 seedlings at the V3 stage, the effective concentration of leaf-applied bentazon causing 50% redu

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31

Vranjic, John Anton. "Whole plant responses of eucalypt seedlings to infestation by scale insects." Phd thesis, 1993. http://hdl.handle.net/1885/140631.

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32

Bussey, Melinda Jane. "Development of a leaf disc assay for detecting resistance to early blight on potato seedlings." 1988. http://catalog.hathitrust.org/api/volumes/oclc/19062308.html.

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33

Ramatsitsi, Mukondeleni Ndivhuwo. "Mechanism of resistance to Meloidogyne Incognita and Meloidogyne Javanica in Cucumis Africanus and Cucumis myriocarpus seedlings." Thesis, 2017. http://hdl.handle.net/10386/1935.

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Thesis (M.Sc. (Horticulture)) -- University of Limpopo, 2017.<br>Root-knot (Meloidogyne species) nematodes are economically destructive pathogens of over 3000 species, whereas others have resistance to Meloidogyne species. Wild watermelon (Cucumis africanus) and wild cucumber (Cucumis myriocarpus) are highly resistant to Meloidogyne species, particularly M. incognita and M. javanica. The two Cucumis species are used in inter-generic grafting with watermelon (Citrullus lanatus) as nematode resistant rootstocks. Also, the two Cucumis species are used in traditional medicine and in plant-parasiti

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34

Jimenez-Casas, Marcos. "Effects of NaCl on growth and physiology of Pinus leiophylla seedlings." Phd thesis, 2009. http://hdl.handle.net/10048/446.

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Identification of salt- resistant tree species and genotypes is needed for rehabilitation of lands affected by salinity in Mexico. This dissertation consists of four studies for analyzing the responses of Pinus leiophylla seedlings to salt. In the first study, resistance to salt stress was studied in six-month-old seedlings from eight different sources of seed collected from the areas with contrasting precipitation levels. Plants from the xeric areas were shorter and had smaller stem diameters but were less sensitive to salt stress and recovered faster from salt injury compared with the plants

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35

Smit, Julie. "Effects of root growth and physiology on drought resistance in Douglas-fir, lodgepole pine, and white spruce seedlings." Thesis, 1993. https://dspace.library.uvic.ca//handle/1828/9656.

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Two aspects of drought resistance were investigated on wet and dry ecotypes of three conifer species: 1) the relative importance of drought avoidance and drought tolerance mechanisms in resisting drought stress was assessed on Douglas-fir (Pseudotsuga menzieseii) and lodgepole pine (Pinus contorta) seedlings, and 2) the effects of drought on root hydraulic conductance and low temperature, on root water flow rates Were assessed on first-year seedlings of Douglas-fir, lodgepole pine and white spruce (Picea glauca). To study drought avoidance, Douglas-fir and lodgepole pine seedlings were

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36

Snyman, Marisha. "Salicylic acid-mediated potentiation of Hsp70 in tomato seedlings is modulated by heat shock factors." Thesis, 2012. http://hdl.handle.net/10210/6172.

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Ph.D.<br>In plants, salicylic acid (SA) is a signaling molecule that regulates disease resistance responses such as systemic acquired resistance (SAR) and the hypersensitive response (HR), and has been implicated in both basal and acquired thermotolerance. It has also been shown that SA enhances heat-induced Hsp/Hsc70 accumulation in plants. In this study, temperature studies revealed that heat shock (HS) at 40 °C for 30 min significantly induced Hsp/Hsc70 accumulation in 3-week old tomato (UC82B) seedlings. Time- and dose-responsive studies showed that 0.1 mM SA for 17 hrs was unable to induc

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37

Meehan, Mitchell Elwin. "A comparison of techniques for screening for resistance to the chinch bug, Blissus leucopterus leucopterus (Say), in sorghum." 1985. http://hdl.handle.net/2097/27497.

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38

Chen, Yun-Hao, and 陳昀皓. "Studies on Inoculation Methods of Guava (Psidium guajava L.) Seedlings with Nalanthamala psidii (syn. Myxosporium psidii) and the Screening for Resistance." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/98794940895667522998.

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碩士<br>國立臺灣大學<br>園藝學研究所<br>100<br>Myxosporium wilt, caused by the pathogen Nalanthamala psidii (Sawada et Kurosawa) Schroers & M. J. Wingf. (≡Myxosporium psidii Sawada et Kurosawa), belongs to one of systemical fungal diseases. This disease has been the most severe and destructive disease of guava (Psidium guajava) cultivation in Taiwan since the 1970s due to the development of pruning techniques for nonseasonal production. The pruning techniques result in numerous wounded sites and increase chances for the invasion of this pathogen. No chemical could prevent or cure this disease and no other s

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39

Hsieh, Tzu-Yang, and 謝子揚. "Evaluation for efficacy of total protein extracted from Alternaria tenuissima APR01 on inducing Chinese cabbage seedlings resistant to Rhizoctonia damping-off." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/33191374976371785045.

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碩士<br>國立中興大學<br>植物病理學系所<br>98<br>Twelve isolates of Alternaria spp. were isolated from various crops in Taiwan. Those fungi were respectively grown in liquid culture media for 5-7 days and harvested their mycelia. The mycelial samples were pulverized in liquid nitrogen, and then homogenized with precooled Tris-buffer, estimated the quantity of their total protein by the Bradford method, bovine serum albumin (BSA) solution was used as a standard, the absorbance value equal to 2 µg BSA/ml. Spraying the mycelial extracts obtained from Alternaria spp. on Chinese cabbage seedlings inoculated with R

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40

Aldana, Juan Andres. "Resistance mechanisms to Didymascella thujina (Durand) Maire in Thuja plicata Donn ex D. Don, Thuja standishii (Gord.) Carrière and Thuja standishii x plicata." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/10058.

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Plants and microorganisms interact with each other constantly, with some interactions being mutually beneficial and others being detrimental to the plants. The features of the organisms involved in such interactions will determine the characteristics of individual pathosystems. Plants respond readily to pathogen attacks, regardless of the pathosystem; furthermore, variation in the resistance to pathogens within species is common and well documented in many plant species. The variability in pathogen resistance is at the core of genetic improvement programs for disease resistance. True resistanc

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