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Identification and fine mapping of a major R gene to Magnaporthe oryzae in a broad-spectrum resistant germplasm in rice

文献类型： 外文期刊

作者： Xiao, Wuming 1 ; Yang, Qiyun 3 ; Wang, Hui 1 ; Duan, Jun 2 ; Guo, Tao 1 ; Liu, Yongzhu 1 ; Zhu, Xiaoyuan 3 ; Chen, Zhiqia 1 ;

作者机构： 1.S China Agr Univ, Natl Engn Res Ctr Plant Space Breeding, Guangzhou 510642, Guangdong, Peoples R China

2.Chinese Acad Sci, S China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China

3.Guangdong Acad Agr Sci, Plant Protect Res Inst, Guangzhou 510640, Guangdong, Peoples R China

关键词： Rice blast;Gene mapping;Resistance evaluation;Pathotyping

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

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收录情况： SCI

摘要： Identification of R genes and development of associated molecular markers will facilitate their application in the development of crop cultivars resistant to disease. We evaluated the resistance of a resistant germplasm 'D69', 10 monogenic lines, and model cultivar 'Nipponbare' to 56 M. oryzae isolates of blast disease in rice. The results demonstrated that only D69 exhibited full-spectrum resistance among the 12 investigated materials. Resistance inheritance in D69 was analyzed using a stable isolate GD08T13 with strong pathogenicity, collected from diseased panicles. A single dominant R gene was revealed and designated as Pi51(t). Through linkage analysis and the development of new markers, Pi51(t) was subsequently delimited to an interval of ~100.8 kb flanked by markers Ind306 and RM19818, where Pi2, Pi9, Piz, Piz-t, Pigm(t), and Pi40(t) reside. Different genotypes identified by linked markers pB8, Pi9-2, zt56591, and T845, and different pathotypes to the same set of isolates, distinguished Pi51(t) from Pi2, Pi9, Piz, and Piz-t. The origin of Pi40(t) in wild rice suggests that Pi51(t) and Pi40(t) are different. Comparison of resistance spectra suggests multiple R genes in D69, making its resistance durable and valuable in breeding programs. The results of this work will facilitate future studies on cloning and functional analysis of blast resistance genes for rice improvement.Digital Object Identifier http://dx.doi.org/10.1007/s11032-012-9755-2

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