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Putative Thinopyrum intermedium-derived stripe rust resistance gene Yr50 maps on wheat chromosome arm 4BL

文献类型： 外文期刊

作者： Liu, Jie 1 ; Chang, Zhijian 2 ; Zhang, Xiaojun 2 ; Yang, Zujun 4 ; Li, Xin 2 ; Jia, Juqing; Zhan, Haixian 2 ; Guo, Hui 1 ;

作者机构： 1.Shanxi Univ, Coll Life Sci, Taiyuan 030006, Shanxi, Peoples R China

2.Shanxi Acad Agr Sci, Inst Crop Sci, Taiyuan 030031, Shanxi, Peoples R China

3.Minist Agr, Key Lab Crop Gene Resources & Germplasm Enhanceme, Taiyuan 030031, Shanxi, Peoples R China

4.Univ Elect Sci & Technol China, Sch Life Sci & Tec

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）

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收录情况： SCI

摘要： Stripe rust-resistant wheat introgression line CH223 was developed by crossing the resistant partial amphiploid TAI7047 derived from Thinopyrum intermedium with susceptible cultivars. The resistance is effective against all the existing Chinese stripe rust races, including the most widely virulent and predominant pathotypes CYR32 and CYR33. Cytological analyses using GISH detected no chromosomal segments from Th. intermedium. It was presumed that the segment was too small to be detected. Normal bivalent pairing at meiosis in CH223 and its hybrids confirmed its stability. Genetic analysis of the F-1, F-2, F-3 and BC1 populations from crosses of CH223 with susceptible lines indicated that resistance was controlled by a single dominant gene. The resistance gene was mapped using an F-2:3 population from Taichung 29/CH223. The gene was linked to five co-dominant genomic SSR markers, Xgwm540, Xbarc1096, Xwmc47, Xwmc310 and Xgpw7272, and flanked by Xbarc1096 and Xwmc47 at 8.0 and 7.2 cM, respectively. Using the Chinese Spring nulli-tetrasomic and ditelosomic lines, the polymorphic markers and the resistance gene were assigned to chromosome arm 4BL. As no permanently named stripe rust resistance genes had been assigned to chromosome 4BL, this new resistance gene is designated Yr50. The gene, together with the identified closely linked markers, could be used in marker-assisted selection to combine two or more resistance genes in a single genotype.

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