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 52 for “"association mapping"”.
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Genetic Association Mapping : Missing Markers, Epistatic Effects, and Applications
<p>Association mapping has been widely used to detect desirable genetic markers associated with traits of interest for plant improvement. Missing marker data are a common and yet challenging issue in many association mapping studies, especially as the number of markers used for these studies is …
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NESTED ASSOCIATION MAPPING TO IDENTIFY SEED COMPOSITION QTL IN DIVERSE SOYBEAN LINES
Soybeans are economically the most important legume grown worldwide. It provides quality protein and oil to food and feed markets in addition to being used for industrial products. The value of soybean could be enhanced by increasing protein, oil, and sucrose contents, while lowering …
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ASSOCIATION MAPPING OF GENE REGIONS FOR DROUGHT TOLERANCE AND AGRONOMIC TRAITS IN SORGHUM
Genetic improvement of sorghum (Sorghum bicolor (L.) Moench) for drought tolerance and grain yield is challenging because of the complex nature of these traits. To make this process more tractable, studies were conducted to investigate the genetic architecture of these traits by employing a novel …
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Genome-wide association mapping of temperature response in agronomically important traits of soybean
… under temperature stress. Genome-wide association study (GWAS) using high-density and high-quality single nucleotide polymorphisms (SNPs) is a powerful tool to associate markers and important traits. The aims of this study are: 1) to characterize the effects of low and high ambient …
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Identification of molecular markers and association mapping of selected loci associated with agronomic traits in rice
Discriminate Analysis as a procedure was evaluated to select molecular markers associated with complex traits in US rice germplasm. Markers for percent head rice, percent total rice, and grain yield were identified with high levels of correct classification that mapped within or near traditional …
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Using a barley Nested Association Mapping (NAM) Population to mine wild barley germplasm for crop improvement
… we have used the multi-parental barley Nested Association Mapping (NAM) population HEB-25,, comprising 1,420 lines, sub-divided into 25 families, each of which was generated by crossing the spring barley cultivar Barke with one of 25 different wild barley accessions. This thesis describes a two …
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Association Mapping for Elemental Concentration Resulting from Vegetative Stage Soil Waterlogging Stress in Wheat (Triticum aestivum L.)
… sodium. The objectives of this study were to use association mapping (AM) to identify SNP associated with the EC in the vegetative tissue of a set of 240 diverse soft winter wheat genotypes (AM panel) grown under field WL and to determine the impact of WL on wheat yield (GY) and yield components …
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Linking transcript, QTL and association mapping to understand the genetic control of leaf size and shape in Populus
… 0.09) in P.nigra, a candidate gene approach for association is valid. Candidate genes were selected from Quantitative Trait Loci (QTL), from a microarray experiment and from bioinformatics and literature searches, identifying sixty robust genes. From this list eight candidate genes were selected …
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Genomic Selection, Quantitative Trait Loci and Genome-Wide Association Mapping for Spring Bread Wheat (Triticum aestivum L.) Improvement
… traits in plants are linkage analysis and association mapping. These methods are used to identify markers associated with quantitative trait loci (QTL) that underlie trait variation, which are used for marker assisted selection (MAS). Marker assisted selection has been successful to improve …
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Molecular characterization of signaling mechanisms in flowering transition in arabidopsis and association mapping of temperature response in floral development within glycine soja
… phenylalanine has very little impact on 5PTase13 association. We observed that transiently expressed 5PTase13 in N. tabacum and Arabidopsis shifted localization from the ER to the nucleus upon application of the vesicle trafficking inhibitor, brefeldin A. Moreover, 5PTase13 experiences a similar …
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Fine mapping of the protein QTL cqSeed protein-001 from PI 407788A and genome-wide association mapping in the soyNAM populations using DNA cytosine methylation
… be improved without sacrificing yield. The fine mapping and further characterization of the QTL cqSeed protein-001, an important QTL that impacts protein and oil concentration, can facilitate such improvement in soybean. In addition, the contribution of epigenetic variation to phenotypic …
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Genome-wide association study of Barley Yellow Dwarf Virus resistance in a Nested Association Mapping population of winter wheat using Skim Exome Capture and Practical Haplotype Graph imputation
… approach. In this study, a genome-wide association study (GWAS) was conducted to identify loci associated with BYDV resistance in a Nested Association Mapping (NAM) population of winter wheat derived from ‘Overland’. Phenotypic evaluations were conducted under natural BYDV infection, …
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Evaluation of soybean cyst nematode (SCN) resistance in perennial glycine species and genome-wide association mapping and genomic prediction study for SCN resistance in common bean and prediction of the short distance movement of soybean rust urediniospores through machine learning
… In the second chapter of my thesis, genome-wide association study (GWAS) was used to detect SNPs significantly associated with SCN resistance in the core collection of P. vulgaris and to make genomic predictions (GPs) of SCN resistance to two HG types. GWAS identified SNPs that are significantly …
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Genetic Regulation of Intrinsic Endurance Exercise Capacity in Mice
… in 34 strains of inbred mice using genome-wide association mapping. 2) The effect of chromosome substitution on endurance exercise capacity using linkage analysis in F2 mice. 3) The effect of chromosome substitution on endurance exercise capacity using wild-derived mice. The main findings of …
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Genomic and Physiological Approaches to Improve Drought Tolerance in Soybean
… improvement of drought tolerance. Genome-wide association studies (GWAS) are one of the genomic approaches to provide a high mapping resolution for complex trait variation such as those related to drought tolerance. The objectives of this research were to identify genomic regions and favorable …
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Statistical methods for genetics and genomics studies
… Genetics study : although population-based association mapping may be subject to the bias caused by population stratification, alternative methods that are robust to population stratification such as family-based linkage analysis have lower mapping resolution. In this dissertation, we …
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High-Throughput Phenotyping and Genomic Prediction in Multi-Environment Plant Breeding Field Trials
… hexaploid wheat (Triticum aestivum L.) nested-association mapping population consisting of 1160 recombinant inbred lines was evaluated in yield trials conducted at three locations during the 2020 and 2021 growing seasons. UAV-based multispectral imaging was conducted at 10-15 timepoints …
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The Genetic Architecture Of Quantitative Disease Resistance In Maize
… anamorph Exserohilum turcicum). The maize nested association mapping (NAM) population, a reference design population consisting of 4,630 recombinant inbred lines, was evaluated over three environments for quantitative resistance to NLB, giving highly heritable resistance phenotypes. Over 200 …
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Algorithms for genomics and genetics : compression-accelerated search and admixture analysis
… histories of human populations and facilitating association mapping of disease genes. Our recently released ALDER and MixMapper software packages provide fast, sensitive, and robust methods for detecting and analyzing signatures of admixture created by genetic drift and recombination on …
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Testing new genetic and genomic approaches for trait mapping and prediction in wheat (Triticum aestivum) and rice (Oryza spp)
… They have also supported the use of novel mapping approaches, including Multi-parent Advanced Generation Inter-Cross (MAGIC) populations which have increased precision in identifying markers to inform plant breeding practices. In the first part of this thesis, a high density physical map …
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