Global ETD Search
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 34 for “"partial resistance"”.
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Selection for partial resistance to crown rust in oat
… reduces kernel quality and grain yield in oat. Partial resistance is considered to be a durable form of rust resistance. The objectives of this study were to evaluate the effectiveness of index selection as a method for improving partial resistance to crown rust, grain yield and seed weight in …
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Genetics of partial resistance of wheat to septoria tritici blotch
… foliar disease of wheat in many countries. Most resistance in wheat cultivars is partial resistance, which is polygenic, or oligogenic and non-specific to particular pathogen genotypes, and hence is durable. Selection for partial resistance to STB may be restricted if that trait has a significant …
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Host range of Septoria glycines, quantification of partial resistance, and brown spot evaluation of soybeans regenerated from calli
… the world. The host range of S. glycines, partial resistance to brown spot in soybean, and brown spot and yield evaluation of soybeans regenerated from calli resistant to a pathotoxin produced by S. glycines were studied.
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Evaluating populations derived from complex crosses involving both bread wheat and durum wheat parentage for partial resistance to crown rot
… To decrease this potential loss, breeding of partially resistant cultivars could complement agronomic approaches. However, the limited variation in durum has meant that development of partially resistant lines is still a major objective to overcome. The aim of this study was to evaluate, …
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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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Probing the mechanisms of action and resistance of mixed-ligand platinum(II) complexes with dual-stage antiplasmodium activity
… part attributable to the emergence and spread of resistance to most clinical chemotherapeutics. With the reported development of partial resistance to the current front-line artemisinin-based combination therapies, there is an increased risk of malaria morbidity and mortality as limited …
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Phytophthora Sojae Infecting Soybean: Pathotype Diversity, New Sources of Resistance and Interaction with the Soybean Cyst Nematode
… pathotype diversity, identification of new resistance sources and the interaction with the soybean cyst nematode (<em>Heterodera glycines</em> Ichinohe, SCN), this research was undertaken with the following objectives - 1) to characterize the pathotype diversity of <em>P. sojae</em> causing …
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Identification and analysis of mechanisms involved in a broad-spectrum disease resistant mutant of the winter wheat cv. Guardian
… aestivum) cv. Guardian exhibits broad-spectrum resistance to powdery mildew (Blumeria graminis f. sp. tritici), yellow rust (Puccinia striiformis f. sp. tritici), and leaf rust (Puccinia recondita f. sp. tritici), along with partial resistance to stagnonospora nodorum blotch (caused by the …
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Identification and mapping of a resistance gene to barley leaf rust(<I>Puccinia hordei</I> G. Otth)
… incorporation of new and effective sources of resistance are crucial to the success of barley breeding programs. Two types of resistance have been identified. They are race-specific resistance and partial resistance. A hypersensitive reaction by the host to infection of <I>P. hordei</I> …
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Control of Turnip yellows virus: Assessing impact on oilseed rape quality traits and dissecting circulative transmission by aphids
… oilseed rape crop was established and sources of partial resistance to TuYV and aphids were investigated. TuYV reduces yield and has a subtle impact on seed physiology including small changes to fatty acid profiles and glucosinolate content. Furthermore, these changes appear to be …
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Study of genetic modifiers of fetal hemoglobin and mechanisms of hydroxyurea-induced γ-globin expression in sickle cell disease
… mutation (HbS) in SSA has been amplified by the partial resistance to Plasmodium falciparum malaria, which is endemic along tropical equatorial Africa. Several genetic variants have since been associated with fetal hemoglobin (HbF), the disease-ameliorating globin protein, including variants at …
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Evaluation of fertile lines derived from the hybridization of Glycine max and G. tomentella
… tool for incorporating traits such as disease resistance into many crops, but has not been utilized in soybean (Glycine max), besides a few examples involving its ancestor, G. soja. G. tomentella (2n=78) is a wild, perennial relative in the tertiary gene pool of cultivated soybean G. max …
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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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Tissue culture and transformation of introducing genes useful for pest management in rice
… including Louisiana. Breeders have incorporated partial resistance into commercial rice varieties to control the disease, but a higher level of resistance is needed. It has been demonstrated that the pathogenesis-related (PR) proteins ¦Â-1, 3-glucanase and chitinase are components of effective …
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Epidemiology of and resistance to kernel infection of sweet corn by Fusarium moniliforme
… on seedling emergence, to identify sources of resistance to kernel infection by F. moniliforme, and to determine the site of resistance. It was found that kernel carbohydrate content did not significantly affect kernel infection by F. moniliforme. The length and color of exposed silks at the …
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Essays on liquidity and information
… and find conditions such that unsuccessful partial defenses are possible equilibrium outcomes. There exist priors over the distribution of speculators' payoffs that can justify any possible partial defense strategy. With Normal uncertainty, partial resistance is more likely when there is …
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Validation, Saturation, and Marker-Assisted Selection of Quantitative Trait Loci Conferring Adult Plant Resistance to Powdery Mildew in an Elite Wheat Breeding Population
… have shifted to breeding for more durable resistance, such as "adult plant resistance" (APR). Molecular markers and quantitative trait loci (QTL) associated with APR to powdery mildew must first be validated and QTL effects evaluated in different genetic backgrounds and breeding populations …
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Combining and mapping QTL for fusarium head blight (FHB) resistance in wheat
… semi-humid regions around the world. Single gene resistance to FHB in wheat provides only partial resistance and also the disease severity is highly influenced by environment. Consequently multiple genes are required for effective resistance. Our hypothesis is that identifying DNA markers for type …
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