Genetic Studies for Improve Agronomic Performance under Abiotic and Biotic Stresses in Spring Wheat

Jayfred Gaham V. Godoy

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Genetic Studies for Improve Agronomic Performance under Abiotic and Biotic Stresses in Spring Wheat

Dissertation

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Genetic Studies for Improve Agronomic Performance under Abiotic and Biotic Stresses in Spring Wheat

Jayfred Gaham V. Godoy

Doctor of Philosophy (PhD), Washington State University

01/2016

Handle:

https://hdl.handle.net/2376/112729

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Supplemental File No 2_1 and 2_2 - Frequency Distribution of BLUEs for both treatments213.51 kBDownload View

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Supplemental File No 2_3 and 2_4 - Frequency Distribution of BLUEs for both treatments383.86 kBDownload View

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Supplemental File No 2_5 - Kelse x Scarlet Genetic Linkage Map84.47 kBDownload View

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Abstract

GWAS

Heat Tolerance

QTL mapping

Spring Wheat

Stripe Rust

Yield and Yield Components

Agriculture

Wheat (Triticum aestivum L.) is the main source of food for roughly one-third of the world’s population. In order to satisfy demand, wheat is planted over millions of acres and exposed to various abiotic and biotic stresses such as heat stress and stripe rust (Puccinia striiformis). Development of cultivars with improved agronomic performance and stable yields is necessary to prevent yield losses and possibly food shortage. A quantitative trait loci (QTL) mapping study was performed using a recombinant inbred population derived from a cross between elite spring wheat varieties ‘Kelse’ and ‘Scarlet’ to identify QTL associated with heat tolerance under natural and controlled conditions. Our analysis yielded 19 QTL linked to 14 traits related to heat tolerance. A pleiotropic region for yield components was detected on chromosome 4AL which can be a valuable resource of favorable alleles for heat tolerance. Genome-wide association analysis was conducted on a population of elite North American germplasm to detect significant marker-traits associations (MTAs) for resistance to stripe rust infection and improved grain yield and yield component traits. Eleven highly significant (FDR<0.01) single nucleotide polymorphism (SNP) markers were associated with adult plant resistance (APR) to stripe rust. Three MTAs located on chromosomes 3A, 5D, 7A are potentially novel QTL for APR. A total of 415 marker-trait associations were identified across 17 morpho-agronomic traits. Some of these QTL were validations of previously conducted QTL mapping studies but newly discovered associations especially for yield and yield components can be very valuable in MAS following proper validation.

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Details

Title: Genetic Studies for Improve Agronomic Performance under Abiotic and Biotic Stresses in Spring Wheat
Creators: Jayfred Gaham V. Godoy
Contributors: Michael O Pumphrey (Advisor)
Scot H Hulbert (Committee Member)
Camille M Steber (Committee Member)
Deven R See (Committee Member)
Awarding Institution: Washington State University
Academic Unit: Department of Crop and Soil Sciences
Theses and Dissertations: Doctor of Philosophy (PhD), Washington State University
Number of pages: 229
Identifiers: 99900581519701842
Language: English
Resource Type: Dissertation