Journal article
Genetic Architecture of Resistance to Stripe Rust in a Global Winter Wheat Germplasm Collection
G3 (Bethesda, Md.), Vol.6(8), pp.2237-2253
08/09/2016
Handle:
https://hdl.handle.net/2376/103633
PMCID: PMC4978880
PMID: 27226168
Abstract
Virulence shifts in populations of Puccinia striiformis f. sp. tritici (Pst), the causal pathogen of wheat stripe rust, are a major challenge to resistance breeding. The majority of known resistance genes are already ineffective against current races of Pst, necessitating the identification and introgression of new sources of resistance. Germplasm core collections that reflect the range of genetic and phenotypic diversity of crop species are ideal platforms for examining the genetic architecture of complex traits such as resistance to stripe rust. We report the results of genetic characterization and genome-wide association analysis (GWAS) for resistance to stripe rust in a core subset of 1175 accessions in the National Small Grains Collection (NSGC) winter wheat germplasm collection, based on genotyping with the wheat 9K single nucleotide polymorphism (SNP) iSelect assay and phenotyping of seedling and adult plants under natural disease epidemics in four environments. High correlations among the field data translated into high heritability values within and across locations. Population structure was evident when accessions were grouped by stripe rust reaction. GWAS identified 127 resistance loci that were effective across at least two environments, including 20 with significant genome-wide adjusted P-values. Based on relative map positions of previously reported genes and QTL, five of the QTL with significant genome-wide adjusted P-values in this study represent potentially new loci. This study provides an overview of the diversity of Pst resistance in the NSGC winter wheat germplasm core collection, which can be exploited for diversification of stripe rust resistance in breeding programs.
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Details
- Title
- Genetic Architecture of Resistance to Stripe Rust in a Global Winter Wheat Germplasm Collection
- Creators
- Peter Bulli - Department of Crop and Soil Sciences, Washington State University, Pullman, Washington 99164-6420Junli Zhang - Department of Plant Sciences, University of California, Davis, California 95616Shiaoman Chao - USDA-ARS Genotyping Laboratory, Biosciences Research Laboratory, Fargo, North Dakota 58102Xianming Chen - USDA-ARS, Wheat Health, Genetics and Quality Research Unit, Washington State University, Pullman, Washington 99164 Department of Plant Pathology, Washington State University, Pullman, Washington 99164Michael Pumphrey - Department of Crop and Soil Sciences, Washington State University, Pullman, Washington 99164-6420 m.pumphrey@wsu.edu
- Publication Details
- G3 (Bethesda, Md.), Vol.6(8), pp.2237-2253
- Academic Unit
- Crop and Soil Sciences, Department of; Plant Pathology, Department of
- Publisher
- United States
- Identifiers
- 99900546690201842
- Language
- English
- Resource Type
- Journal article