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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (03): 355-360.doi: 10.3724/SP.J.1006.2008.00355


Molecular Characterization of

FANG Ti-Lin1,CHENG Ying1,LI Gen-Qiao1,XU Shi-Chang2,XIE Chao-Jie1,YOU Ming-Shan1,YANG Zuo-Min1,SUN Qi-Xin1,LIU Zhi-Yong1*   

  1. 1 State Key Laboratory of Agro-Biotechnology/ Key Laboratory of Crop Genomics and Genetic Improvement, Ministry of Agriculture/ Beijing Key Laboratory of Crop Genetic Improvement/ Key Laboratory of Crop Heterosis, Ministry of Education, China Agricultural University, Beijing 100094; 2 Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China
  • Received:2007-09-05 Revised:1900-01-01 Online:2008-03-12 Published:2008-03-12
  • Contact: LIU Zhi-Yong

Abstract: Yellow rust, caused by Puccinia striiformis f. sp. tritici (PST), is one of the most devastating diseases in common wheat (Triticum aestivum L.) worldwide. Molecular markers are powerful tools in marker-assisted selection, gene pyramiding and gene cloning of important crop traits, especially for disease resistance. The objectives of this study were to develop tightly linked molecular marker of a yellow rust resistance gene against the prevalent Chinese races of Puccinia striiformis f. sp. tritici in an improved wheat line S2199 and to characterize its allelism with Yr5. Genetic analysis indicated that a single dominant gene was responsible for the yellow rust resistance in S2199, temporarily designated YrS2199. By screening 1 856 pairs of SSR primers, two markers—Xdp269 and Xgwm120 were found to be linked to the yellow rust resistance gene, with genetic distance of 0.7 and 11.0 cM, respectively. SSR marker Xgwm120 has been genetically and physically mapped on 2BL chromosome arm in wheat. By using Chinese Spring nullisomic-tetrasomics, ditelosomics and deletion lines of homoeologous group 2, Xdp269 was physically mapped on the terminal bin (0.89–1.00) of chromosome arm 2BL. Both allelism test of 700 F2 plants from the cross YrS2199/Yr5 and seedling tests of YrS2199 and Yr5 on 14 PST isolates indicated that YrS2199 and Yr5 are likely to be the same gene or allelic genes. The YrS2199 tightly linked SSR marker Xdp269 could be used as potential tool in cloning the yellow rust resistance gene or marker assisted breeding program.

Key words: Wheat, Stripe rust, Simple sequence repeat (SSR), S2199, Yr5

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