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 20 for “"resistance breeding"”.
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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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Broadening the wheat gene pool for stem rust resistance through genomic-assisted introgressions from Aegilops tauschii
… (2n=2x=14,DD) has provided numerous genes for resistance to diseases and insect pests that attack bread wheat (Triticum aestivum L. (2n=6x=42, AABBDD). Wheat production is currently threatened by broadly virulent races of the ‘Ug99’ lineage of wheat stem rust caused by the fungus, Puccinia …
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Detection of Fusarium Head Blight on Wheat Spikelets Using a Multi-Scale Feature Fusion CNN Model
… for developing resistant wheat varieties through breeding. However, current methods for collecting and analyzing wheat phenotypic data are time-consuming, labor-intensive, and often imprecise, particularly at the spikelet level, where disease symptoms are more nuanced and challenging to detect. …
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Resistance to anthracnose leaf blight in sorghum
… the pathogen. Qualitative and quantitative host resistance has been reported for anthracnose leaf blight. However, the evolving nature of the pathogen increases the need to identify more resistance sources that are effective against isolates collected from different locations. In addition, little …
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Use of digital image analysis to identify <i>Rhizoctonia solani</i> and <i>Rhizoctonia zeae</i> resistance in <i>Festuca arundinacea</i> plant introductions
… may contribute to variability in observed BP resistance of TF cultivars at multiple locations. The objectives of this study were to develop an objective digital image analysis (DIA) method for evaluating disease and to use DIA to screen tall fescue plant introductions (PIs) for resistance to …
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Evaluation of Downy Mildew (Peronospora farinosa f.sp. chenopodii) Resistance among Quinoa Genotypes and Investigation of P. farinosa Growth using Scanning Electron Microscopy
… genetic diversity, some of which exhibit mildew resistance. Methods for evaluating mildew severity are important for finding resistant genotypes that are useful in breeding programs. The main objectives of this study were to evaluate and investigate downy mildew resistance in quinoa through …
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A genetic study of resistance to kernel infection by Aspergillus flavus in maize (Zea mays L.)
… a chronic problem in the southern USA. Genetic resistance to A. flavus is needed to solve this problem. To ascertain and understand the inheritance of resistance to field kernel infection by A. flavus, a five-parent diallel analysis and a half-sib family analysis of 35 maize crosses were …
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Molecular characterization of tomato brown rugose fruit virus-host interactions and development of biocontrol strategies
… The virus can break down durable extreme resistance (ER) to its related tobamoviruses conferred by the NLR gene Tm-22. Currently, no effective control strategies are available. This thesis research was designed to better understand ToBRFV at the molecular level, explore the mechanisms by …
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Whole genome analysis of the koa wilt pathogen (Fusarium oxysporum f. sp. koae) and development of molecular tools for early detection and monitoring
… for informing land managers and disease resistance breeding programs. Current methods to distinguish pathogenic isolates are conducted through costly, extensive greenhouse virulence assays. Genomic comparisons of pathogens and non-pathogens such as amplified fragment length polymorphisms …
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Simple sequence repeat polymorphism screening for resistance to Cercospora Arachidila in groundnut(Arachis Hypogaea)Genotypes
… and the general mode of inheritance to disease resistance complicates the transfer of resistance. Resistance is a low heritability trait governed by quantitatively inherited recessive genes that are controlled by epistatic effects and are closely associated to the environment. Simple Sequence …
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Three Essays on Measuring the Ex-ante Economic Impacts of Agriculture Technology Innovations
… ex-ante economic impact of transgenic drought resistance maize breeding and of conventional maize, millet and sorghum drought resistance breeding in Kenya, Uganda, and the Amhara region in Ethiopia. An expected utility framework is combined with a partial equilibrium model and a spatial drought …
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Preparing plant collections for biological invasions: a study of the effects of emerald ash borer (Agrilus planipennis Fairmaire) through case study analysis
… States. To aid in research initiatives, such as resistance breeding pertaining to the EAB invasion, this study also sought to investigate the current state of ex situ Fraxinus collections globally. Research methodology primarily included qualitative, semi-structured, onsite interviews with staff …
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Dissecting the genetic basis of wheat yellow rust resistance in the NIAB Elite MAGIC population
… outbreaks and have jeopardised wheat yellow rust resistance levels in the main wheat-producing regions globally. Widespread epidemics have been further facilitated by the deployment of genetically uniform material underpinned by major resistance over large areas. With such a rapidly changing Pst …
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Functional Characterization of Four Xanthomonas euvesicatoria Type III Effectors
… 10% of the total crop yield in the world. Breeding tomato and pepper cultivars with improved BS disease resistance is one of the most important breeding goals. A better understanding of the virulence mechanism of Xe could help breeders design new strategies for resistance breeding. In this …
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Identification of phytotoxins produced by fusarium virguliforme associated with foliar symptoms of sudden death syndrome and genome-wide association studies for soybean disease resistance
… that eventually became the foundation for resistance breeding. The development of ""molecular biology"" and ""biotechnology"" in the 1950s to 2000s enabled molecular studies using forward and reverse genetics to understand the biological and physiological mechanisms of microbes, plants, and …
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Genetic Determinism of Xanthomonas arboricola pv. pruni (Xap) Resistance, Fruit Quality, and Phenological Traits in Peach and Incorporation of Marker-Assisted Selection (MAS) in the University of Arkansas Peach and Nectarine Breeding Program
… as an innovative approach to increase peach breeding efficiency. Although hundreds of quantitative trait loci (QTLs) have been identified, only a few have been converted into usable MAS tools. This highlights a disconnect between genomic discoveries and practical application in breeding …
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Genetic Resistance to the Downy Mildew Pathogen and Breeding towards Durable Disease Management in Spinach
… for establishing the basis of durable disease resistance development against the downy mildew pathogen (P. effusa 13) in spinach, through the use of various genome engineering approaches.</p> <p>Our results have led (Chapter 2) to the identification of potential stage specific resistance genes …