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

作　　者：Yuanzeng Zhao Xiaomin Lu Chaoxian Liu Haiying Guan Mei Zhang Zhongfeng Li Hongwei Cai Jinsheng Lai 

机构地区：[1]State Key Laboratory of Agrobiotechnology and National Maize Improvement Center,Department of Plant Genetics and Breeding,China Agricultural University,Beijing 100193,China [2]Department of Life Science and Technology,Henan Institute of Science and Technology,Xinxiang 453003,China [3]Henan Academy of Agricultural Sciences,Zhengzhou 450002,China

出　　处：《Journal of Integrative Plant Biology》2012年第5期321-329,共9页植物学报（英文版）

基　　金：supported by the National Key Basic Research Program of China (973 Program,2009CB118400)

摘　　要：rhml is a major recessive disease resistance locus for Southern corn leaf blight （SCLB）. To further narrow down its genetic position, F2 population and BCIFI population derived from the cross between resistant （H95rhm） and susceptible parents （H95） of maize （Zea mays） were constructed. Using newly developed markers, rhml was initially delimited within an interval of 2.5 Mb, and then finally mapped to a 8.56 kb interval between InDel marker IDP961-503 and simple sequence repeat （SSR） marker A194149--1. Three polymorphic markers IDP961-504, IDP B2-3 and A194149-2 were shown to be co-segregated with the rhml 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 H95rhrn 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 LHTI as the candidate gene for rhml 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.rhml is a major recessive disease resistance locus for Southern corn leaf blight （SCLB）. To further narrow down its genetic position, F2 population and BCIFI population derived from the cross between resistant （H95rhm） and susceptible parents （H95） of maize （Zea mays） were constructed. Using newly developed markers, rhml was initially delimited within an interval of 2.5 Mb, and then finally mapped to a 8.56 kb interval between InDel marker IDP961-503 and simple sequence repeat （SSR） marker A194149--1. Three polymorphic markers IDP961-504, IDP B2-3 and A194149-2 were shown to be co-segregated with the rhml 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 H95rhrn 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 LHTI as the candidate gene for rhml 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.

关 键 词：Bipolaris maydis FINE-MAPPING MAIZE rhml Southern corn leaf blight Zea mays. 

分 类 号：S435.121.4[农业科学—农业昆虫与害虫防治] S436.33[农业科学—植物保护]