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Identification of the novel recessive gene pi55(t) conferring resistance to Magnaporthe oryzae

文献类型： 外文期刊

作者： He XiuYing 1 ; Liu XinQiong; Wang Li 2 ; Wang Ling 2 ; Lin Fei 2 ; Cheng YongSheng 1 ; Chen ZhaoMing 1 ; Liao YaoPing; 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou 510640, Peoples R China

2.S China Agr Univ, Coll Nat Resources & Environm Sci, Lab Plant Resistance & Genet, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangzhou 510642, Guangdong, Peoples R China

3.S China

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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