Abstract
Stripe rust (caused by Puccinia striiformis f. sp. tritici) of wheat (Triticum aestivum) is a devastating disease in temperate regions when susceptible varieties are grown and environmental conditions sustain high disease pressures. With frequent and severe outbreaks, disease resistance is a key tool for controlling stripe rust on wheat. The goal of this research was to identify quantitative trait loci (QTL) involved in stripe rust resistance from the important US Pacific Northwest soft white winter wheat varieties “Eltan” and “Finch”. An F2:5 recombinant inbred line (RIL) mapping population of 151 individuals derived from the Finch × Eltan cross was developed through single seed descent. A linkage map comprising 683 unique single nucleotide polymorphism (SNP) loci and 70 SSR markers were used to develop 22 linkage groups consisting of 16 of the 21 chromosomes. Stripe rust data were collected on the RILs during the summers of 2012 to 2014. QTL analysis identified two genomic regions on chromosomes 4A (QYrel.wak-4A) and 6B (QYrfi.wak-6B) associated with resistance from Eltan and Finch, respectively. The results of the QTL analysis showed that QYrel.wak-4A and QYrfi.wak-6B reduced infection type and disease severity. Based upon both molecular and phenotypic differences, QYrel.wak-4A is a novel QTL for adult plant resistance (APR) to stripe rust.
Highlights
Wheat (Triticum aestivum L.) is grown on more hectares than any other crop worldwide with an average 80 million hectares of production annually
Annual stripe rust reports collected from the WSU stripe rust website [35] indicated that PSTv-37 was the only race isolated at Central Ferry in 2012, whereas PSTv-37, PSTv-48, and PSTv-11 were isolated at Pullman
Two quantitative trait loci (QTL) for stripe rust adult plant resistance (APR) identified in this study significantly reduced disease severity (DS) and Infection types (IT) in winter wheat varieties Eltan and Finch
Summary
Wheat (Triticum aestivum L.) is grown on more hectares than any other crop worldwide with an average 80 million hectares of production annually. Hexaploid wheat is highly adaptive to many environments, and having such a vast growing region, wheat is affected by many diseases. Major stripe rust epidemics have occurred globally, with losses in some cases amounting to 25% [2,3]. As a major producer of both spring and winter wheat, the US Pacific Northwest (PNW) has experienced recurrent epidemics. The first of these epidemics occurred in the 1960s, when the PNW experienced several years of stripe rust with significant yield losses of up to 408,000 metric tons in
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