A Novel Source of Resistance in Wheat to Pyrenophora tritici-repentis Race 1

Plant Disease
Sukhwinder SinghRobert Bowden

Abstract

Tan spot, caused by the fungus Pyrenophora tritici-repentis, causes serious yield losses in wheat (Triticum aestivum) and many other grasses. Race 1 of the fungus, which produces the necrosis toxin Ptr ToxA and the chlorosis toxin Ptr ToxC, is the most prevalent race in the Great Plains of the United States. Wheat genotypes with useful levels of resistance to race 1 have been deployed, but this resistance reduces damage by only 50 to 75%. Therefore, new sources of resistance to P. tritici-repentis are needed. Recombinant inbred lines developed from a cross between the Indian spring wheat cvs. WH542 (resistant) and HD29 (moderately susceptible) were evaluated for reaction to race 1 of the fungus. Composite interval mapping revealed quantitative trait loci (QTL) on the short arm of chromosome 3A explaining 23% of the phenotypic variation, and the long arm of chromosome 5B explaining 27% of the variation. Both resistance alleles were contributed by the WH542 parent. The QTL on 5BL is probably tsn1, which was described previously. The 3AS QTL (QTs.ksu-3AS) on 3AS is a novel QTL for resistance to P. tritici-repentis race 1. The QTL region is located in the most distal bin of chromosome 3AS in a 2.2-centimorgan marker interval. Flank...Continue Reading

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Oct 24, 2007·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Sukhwinder SinghRobert L Bowden
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Citations

Nov 14, 2019·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Yuan LiuXuehui Li
Dec 22, 2019·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Justin D FarisZhaohui Liu
Jul 26, 2013·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Justin D FarisSteven S Xu
Mar 16, 2017·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Zhaohui LiuMaricelis Acevedo
Oct 18, 2018·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Eric G DinglasanLee T Hickey

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