Molecular Mapping of the Stripe Rust Resistance Gene Yr69 on Wheat Chromosome 2AS

文献类型： 外文期刊

第一作者： Hou, Liyuan

作者： Hou, Liyuan;Jia, Juqing;Zhang, Xiaojun;Li, Xin;Guo, Huijuan;Zhan, Haixian;Qiao, Linyi;Chang, Zhijian;Zhang, Xiaojun;Li, Xin;Guo, Huijuan;Zhan, Haixian;Qiao, Linyi;Chang, Zhijian;Yang, Zujun;Ma, Jian

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期刊名称：PLANT DISEASE （ 影响因子：4.438； 五年影响因子：4.7 ）

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收录情况： SCI

摘要： Wheat is one of the major food crops in the world. Stripe rust, caused by Puccinia striiformis f. sp. tritici, is an economically important disease that affects wheat worldwide. The discovery of novel resistance genes and the deployment of effectivelyresistant cultivars are important for the ongoing control of wheat stripe rust and the maintenance of the agricultural productivity of wheat. CH7086, a new stripe rust-resistant wheat introgression line, was selected by crossing susceptible cultivars with the resistant Thinopyrum ponricwm-derived partial amphiploid Xiaoyan 7430. The resistance of CH7086 is effective against all current Chinese P. striiformis f. sp. tritici races. CH7086 was crossed with the stripe rust-susceptible cultivars to developF,, F2, F3, and ESQ populations for genetic analysis. Segregation in the F2 and BC, populations and F23lines were tested for resistance against the P. striiformis f. sp. tritici race CYR32. This test showed that CH7086 carries a single dominant gene for stripe rust resistance, which was temporarily designated YrCH86. The closest of the eight simple sequence repeat (SSR) and expressed sequence tag-SSR markers flanking the locus were X2AS33, which is 1.9 cM distal, and Xmag3807, which is 3.1 cM proximal. The resistance gene and its polymorphic markers were placed in deletion bin 2AS-0.78-1.00 using the 'Chinese Spring' nullisomic-tetrasomic, ditelosomic, and deletion lines. The tests of both allelism and resistance specificity suggested that the resistance gene found in CH7086 was not Yrl7, which was the only current formally named Yr gene on chromosome 2AS. Thus, YrCH86 appeared to be a new locus and was permanently designated Yr69.

分类号： S4

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