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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Quantitative Resistance"”.
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Gene Action Conditioning Quantitative Resistance to Northern Leaf Blight in Four Australian Corn Inbred Lines
Made available in DSpace on 2014-12-09T18:06:30Z (GMT). No. of bitstreams: 1 6910731.pdf: 2894612 bytes, checksum: 23852b89460c869f2002a4fff0f66fde (MD5) Previous issue date: 1968
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Genetic characterization of a dominant susceptible Rpp1 allele and analysis of quantitative resistance to Asian soybean rust
… Miles, and Frederick 2007). Soybean natural resistance to P. pachyrhizi has been identified as single R gene-conferred, and seven Rpp (Rpp1-Rpp7; Resistance to Phakopsora pachyrhizi 1-7) gene loci have been identified and mapped (Hartman et al. 2012). Although multiple Rpp genes have been …
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Transcriptional profiling of potential regulatory factors modulating defense mechanisms in soybean during Phytophthora sojae infection
Quantitative resistance is controlled by multiple genes and has been shown to be a durable form of resistance to pathogens affecting cultivated crops including soybeans (Glycine max L. Merr). Root rot of soybean caused by Phytophthora sojae ranks among the most damaging soybean diseases. …
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Optimising fungicide application tactics: using mathematical modelling to understand qualitative and quantitative fungicide resistance management
… by pathogen evolution leading to fungicide resistance and loss of cultivar efficacy (‘cultivar breakdown’). Both fungicide resistance and cultivar breakdown can be characterised as qualitative or quantitative, depending on the genetic basis for resistance/breakdown. Mathematical models have …
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Index, Individual Trait, and Tandem Selection to Improve a Maize Synthetic for Yield, Corn Borer, and Disease Traits
… grain yield (measured on uninoculated plants), quantitative resistance to four common leaf and stalk diseases evaluated separately, the aggregate effect of several common leaf and stalk diseases, and first generation European corn borer (CB) {caused by Ostrinia nubilalis (Hubner)}. These data …
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Identifying loci conferring quantitative disease resistance in sorghum and maize against fungal foliar pathogens
… themselves against pathogens. Broadly disease resistance can be split into qualitative and quantitative resistance. In qualitative resistance the presence of a single resistance gene (R gene) confers complete resistance against the pathogen. R proteins can interact directly as receptors or …
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Genética e mapeamento molecular da resistência parcial à ferrugem da folha da aveia (Avena sativa L.)
… associados à resistência quantitativa (“quantitative resistance loci” ou QRLs). Resultados de três anos evidenciaram alta influência do ambiente na expressão da resistência, apresentando, entretanto, variabilidade genética para resistência parcial nas populações segregantes. A …
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Mapping and Characterization of Phytophthora sojae and Soybean Mosaic Virus Resistance in Soybean
… either through deployment of race-specific resistance or through quantitative resistance termed partial resistance. In the current study, partial resistance to <i>P. sojae</i> was mapped in an interspecific recombinant inbred line (RIL) population of <i>Glycine max</i> by <i>Glycine …
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Characterization of oomycete species causing soybean diseases in Illinois and management applications
… PRR is managed using cultivars with single resistance genes (Rps genes) in combination with seed treatments. In addition to Rps genes, cultivars with quantitative resistance or partial resistance are available for PRR management. The objective of this thesis is to develop precision …
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Small RNAs in Tomato: from defence to development
… sequences conserved in a family of disease resistance genes known Nucleotide biding site leucine-rich repeat (NLR) genes. In this dissertation, I wanted to address the extent to which the miRNA family and its derived phasiRNAs regulate expression of defence genes as well as contribute to …
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Genes and mechanisms in Arabidopsis innate immunity against Leptosphaeria maculans
… identification of the mechanisms required for resistance. The phytoalexin camalexin was first identified as a quantitative resistance factor; whereas accelerated cell death mutants enabled the pathogen to circumvent the resistance mechanisms by switching to a necrotrophic mode of growth. In …
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The oat-crown rust pathosystem: an interaction of a plant, a pathogen, and time
… time, by a process of selection, to defeat the resistances deployed in crop cultivars. The genetic architecture of disease resistance changes as a plant grows from a seedling to an adult plant, matures, and dies. The visual and spectral signature of plant stress and disease also changes as the …
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The Genetic Architecture Of Quantitative Disease Resistance In Maize
Several large scale quantitative genetic studies were conducted to better understand the genetic basis for quantitative disease resistance (QDR) in plants. The focus of these studies was the economically important disease of maize (Zea mays L. ssp. mays), northern leaf blight (NLB, caused by …
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Taxonomy and pathogenicity of rusts from Allium species in the U.K
… and A. babingtonii had high levels of quantitative resistance. There was no evidence of 'hypersensitive-type' resistance in the complex. Tests within one leek cultivar (Musselburgh) showed older plants to be more resistant than seedlings in at least two quantitative components. However …
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Qualitative Resistance to Exserohilum Turcicum Race 2 in Maize (Corn, Genetics)
… effectively for over 15 years by qualitative and quantitative resistance. In 1979 a new race of the fungus (race 2) was found in the U.S. Corn Belt. This study was designed to evaluate currently available sources of qualitative resistance for their effectiveness against race 2. The gene Ht(,1) …
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Barley pathogens in Iceland: Identification, virulence and genetic structure of major barley pathogens in Iceland
… potential. It is therefore recommended to use quantitative resistance along with major gene resistance in cultivar mixtures and multilines in breeding projects for durable resistance to R. secalis and P. teres in Iceland.
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Genetic characterization of Rpp1-mediated Asian soybean rust resistance using in-depth transcriptomic and genomic analyses
… known resistant loci that can confer qualitative resistance in soybean resulting in either red-brown lesions with no or limited sporulation, or immune phenotype of the incompatible interaction that show miniscule or no lesions and no sporulation. Due to the rapid changing nature of rust effector …
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Quantitative Trait Loci for Resistance to Fusarium Head Blight in the Hulless Winter Barley Cultivar Eve
… and incorporation of various sources of resistance. Resistance identified in winter barley cultivar Eve has been identified in Virginia Tech's Small Grains Breeding Program. The objectives of this study are to validate resistance and identify additional resistance QTL, and identify …
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Transcriptomic characterization of soybean – sclerotinia sclerotiorum interaction at early infection stages
… broad host range. No naturally complete resistance has been reported to exist in soybean, which makes it a compelling problem. Studying the molecular interactions between soybean and S. sclerotiorum is a promising approach to identify the soybeans genes that are controlling the …
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Breeding for resistance to clover rot (Sclerotinia spp.) in red clover breeding (Trifolium pratense)
… dependent on weather conditions. Moreover, resistance breeding is hampered by the lack of useable bio-tests and by the lack of knowledge on the genetic and phenotypic variation among Sclerotinia isolates. In this context, the objectives of this thesis were to analyse the phenotypic and …
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