Identification and Fine Mapping of rhm1 Locus for Resistance to Southern Corn Leaf Blight in Maize

文献类型： 外文期刊

第一作者： Zhao, Yuanzeng

作者： Zhao, Yuanzeng;Lu, Xiaomin;Liu, Chaoxian;Guan, Haiying;Zhang, Mei;Li, Zhongfeng;Cai, Hongwei;Lai, Jinsheng;Zhao, Yuanzeng;Lu, Xiaomin;Liu, Chaoxian;Guan, Haiying;Zhang, Mei;Li, Zhongfeng;Cai, Hongwei;Lai, Jinsheng;Zhao, Yuanzeng;Lu, Xiaomin

作者机构：

关键词： Bipolaris maydis;fine-mapping;maize;rhm1;Southern corn leaf blight;Zea mays

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

ISSN： 1672-9072

年卷期： 2012 年 54 卷 5 期

页码：

收录情况： SCI

摘要： rhm1 is a major recessive disease resistance locus for Southern corn leaf blight (SCLB). To further narrow down its genetic position, F2 population and BC1F1 population derived from the cross between resistant (H95rhm) and susceptible parents (H95) of maize (Zea mays) were constructed. Using newly developed markers, rhm1 was initially delimited within an interval of 2.5 Mb, and then finally mapped to a 8.56 kb interval between InDel marker IDP961503 and simple sequence repeat (SSR) marker A1941491. Three polymorphic markers IDP961504, IDP B23 and A1941492 were shown to be co-segregated with the rhm1 locus. Sequence analysis of the 8.56 kb DNA fragment revealed that it contained only one putative gene with a predicted amino acid sequence identical to lysine histidine transporter 1 (LHT1). Comparative sequence analysis indicated that the LHT1 in H95rhm harbors a 354 bp insertion in its third exon as compared with that of susceptible alleles in B73, H95 and Mo17. The 354 bp insertion resulted in a truncation of the predicted protein of candidate resistance allele (LHT1-H95rhm). Our results strongly suggest LHT1 as the candidate gene for rhm1 against SCLB. The tightly linked molecular markers developed in this study can be directly used for molecular breeding of resistance to Southern corn leaf blight in maize.

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