Journal of Integrative Agriculture ›› 2017, Vol. 16 ›› Issue (03): 540-550.DOI: 10.1016/S2095-3119(16)61377-1

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  • 收稿日期:2016-02-08 出版日期:2017-03-20 发布日期:2017-03-07

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

XIE Jing-zhong1, WANG Li-li1, WANG Yong1, ZHANG Huai-zhi1, ZHOU Sheng-hui1, WU Qiu-hong2, CHEN Yong-xing1, WANG Zhen-zhong3, WANG Guo-xin1, ZHANG De-yun1, ZHANG Yan1, HU Tie-zhu4, LIU Zhi-yong1, 2   

  1. 1 State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100193, P.R.China

    2 Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, P.R.China

    3 China Rural Technology Development Center, Beijing 100045, P.R.China

    4 College of Life Science and Technology, Henan Institute of Science and Technology, Xinxiang 453003, P.R.China

  • Received:2016-02-08 Online:2017-03-20 Published:2017-03-07
  • Contact: LIU Zhi-yong, Tel: +86-10-64806422, E-mail: zyliu@genetics.ac.cn; HU Tie-zhu, Tel: +86-373-3040964, E-mail: tiezhuh@163.com
  • About author:XIE Jing-zhong, E-mail: xiejingzhong381@qq.com
  • Supported by:

    This work was financially supported by the National Natural Science Foundation of China (31371624, 31210103902).

Abstract: 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 F2 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.

Key words:  powdery mildew resistance gene, PmTm4, genetic mapping, comparative genomic analysis