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Position: Home > Articles > Fine mapping of powdery mildew resistance gene PmTm4 in wheat using comparative genomics Journal of Integrative Agriculture 2017,16 (3)

Fine mapping of powdery mildew resistance gene PmTm4 in wheat using comparative genomics

作  者：
Xie Jing-zhong;Wang Li-li;Wang Yong;Zhang Huai-zhi;Zhou Sheng-hui;Wu Qiu-hong;Chen Yong-xing;Wang Zhen-zhong;Wang Guo-xin;Zhang De-yun;Zhang Yen;Hu Tie-zhu;Liu Zhi-yong
单  位：
China Rural Technol Dev Ctr, Beijing 100045, Peoples R China;Henan Inst Sci & Technol, Coll Life Sci & Technol, Xinxiang 453003, Peoples R China;Chinese Acad Sci, Inst Genet & Dev Biol, Beijing 100101, Peoples R China;China Agr Univ, State Key Lab Agrobiotechnol, Beijing 100193, Peoples R China
关键词：
powdery mildew resistance gene;PmTm4;genetic mapping;comparative genomic analysis
摘  要：
Powdery mildew, caused by Blumeria graminis f. sp. tritici, is one of the most severe wheat diseases. Mining powdery mildew resistance genes in wheat cultivars and their appliance in breeding program is a promising way to control this disease. Genetic analysis revealed that a single dominant resistance gene named PmTm4 originated from Chinese wheat line Tangmai 4 confers resistance to prevailing isolates of B. graminis f. sp. tritici isolate E09. Detailed comparative genomics analyses helped to develop closely linked markers to PmTm4 and a fine genetic map was constructed using large F-2 population, in which PmTm4 was located into a 0.66-cM genetic interval. The orthologous subgenome region of PmTm4 in Aegilops. tauschii was identified, and two resistance gene analogs (RGA) were characterized from the corresponding sequence scaffolds of Ae. tauschii draft assembly. The closely linked markers and identified Ae. tauschii orthologs in the mapping interval provide an entry point for chromosome landing and map-based cloning of PmTm4.

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