Identification of the novel recessive gene pi55(t) conferring resistance to Magnaporthe oryzae
文献类型: 外文期刊
第一作者: He XiuYing
作者: He XiuYing;Cheng YongSheng;Chen ZhaoMing;Liao YaoPing;He XiuYing;Wang Li;Wang Ling;Lin Fei;Pan QingHua;Liu XinQiong
作者机构:
关键词: rice blast;recessive resistance gene;pi55;resistance inheritance;gene mapping
期刊名称:SCIENCE CHINA-LIFE SCIENCES ( 影响因子:6.038; 五年影响因子:4.754 )
ISSN: 1674-7305
年卷期: 2012 年 55 卷 2 期
页码:
收录情况: SCI
摘要: The elite rice cultivar Yuejingsimiao 2 (YJ2) is characterized by a high level of grain quality and yield, and resistance against Magnaporthe oryzae. YJ2 showed 100% resistance to four fungal populations collected from Guangdong, Sichuan, Liaoning, and Heilongjiang Provinces, which is a higher frequency than that shown by the well-known resistance (R) gene donor cultivars such as Sanhuangzhan 2 and 28zhan. Segregation analysis for resistance with F-2 and F-4 populations indicated the resistance of YJ2 was controlled by multiple genes that are dominant or recessive. The putative R genes of YJ2 were roughly tagged by SSR markers, located on chromosomes 2, 6, 8, and 12, in a bulked-segregant analysis using genome-wide selected SSR markers with F-4 lines that segregated into 3 resistant (R):1 susceptible (S) or 1R:3S. The recessive R gene on chromosome 8 was further mapped to an interval a parts per thousand 1.9 cM/152 kb in length by linkage analysis with genomic position-ready markers in the mapping population derived from an F-4 line that segregated into 1R:3S. Given that no major R gene was mapped to this interval, the novel R gene was designated as pi55(t). Out of 26 candidate genes predicted in the region based on the reference genomic sequence of the cultivar Nipponbare, two genes that encode a leucine-rich repeat-containing protein and heavy-metal-associated domain-containing protein, respectively, were suggested as the most likely candidates for pi55(t).
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