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Agronomy 2016, 6(1), 4; doi:10.3390/agronomy6010004

Novel QTL for Stripe Rust Resistance on Chromosomes 4A and 6B in Soft White Winter Wheat Cultivars

1
Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164-6420, USA
2
USDA-ARS, Wheat Genetics, Physiology, Quality, and Disease Research Unit, and Department of Plant Pathology, Washington State University, Pullman, WA 99164-6430, USA
3
Department of Crop and Soil Science, Washington State University, Pullman, WA 99164-6420, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Diego Rubiales
Received: 20 November 2015 / Revised: 23 December 2015 / Accepted: 28 December 2015 / Published: 6 January 2016
(This article belongs to the Special Issue Breeding for Disease Resistance)
View Full-Text   |   Download PDF [672 KB, uploaded 6 January 2016]   |  

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. View Full-Text
Keywords: plant breeding; Puccinia striiformis f. sp. tritici; disease resistance; QTL mapping; Triticum aestivum plant breeding; Puccinia striiformis f. sp. tritici; disease resistance; QTL mapping; Triticum aestivum
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Klarquist, E.F.; Chen, X.M.; Carter, A.H. Novel QTL for Stripe Rust Resistance on Chromosomes 4A and 6B in Soft White Winter Wheat Cultivars. Agronomy 2016, 6, 4.

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