Resistance spectrum assay and fine mapping of the blast resistance gene from a rice experimental line, IRBLta2-Re

文献类型： 外文期刊

第一作者： Chen, Shen

作者： Chen, Shen;Wang, Xiaojing;Yang, Chengwei;Chen, Shen;Su, Jing;Han, Jingluan;Wang, Wenjuan;Wang, Congying;Yang, Jianyuan;Zeng, Liexian;Zhu, Xiaoyuan;Chen, Shen;Su, Jing;Han, Jingluan;Wang, Wenjuan;Wang, Congying;Yang, Jianyuan;Zeng, Liexian;Zhu, Xiaoyuan

作者机构：

关键词： Rice blast;Resistance spectrum (RS);Resistance gene;Fine mapping;Single amino acid difference

期刊名称：EUPHYTICA （ 影响因子：1.895； 五年影响因子：2.181 ）

ISSN： 0014-2336

年卷期： 2014 年 195 卷 2 期

页码：

收录情况： SCI

摘要： In the present study, we performed the resistance assessment by rice blast inoculation on IRBLta2-Re and IRBLta-CP1, the experimental lines supposed to carry rice blast resistance genes Pita2 and Pita, respectively. The analysis by using 196 rice blast isolates derived from China indicated that the resistance spectrum of IRBLta2-Re was broader than that of IRBLta-CP1. Both IRBLta2-Re and IRBLta-CP1 have the Pita gene by analyzing the functional single amino acid difference of Pita/pita locus. To identify the additional gene in IRBLta2-Re, 1250 F-2 individuals from the cross between CO39 and IRBLta2-Re were used as the mapping population. The F-2 population was inoculated with the blast isolate 08-T4 which was incompatible to IRBLta2-Re, but compatible to CO39 and IRBLta-CP1. In the phenotypic data analysis, the F-2 population segregated in a 3:1 ratio for resistant and susceptible plants, respectively, suggesting that IRBLta2-Re has an additional resistance gene other than Pita, which was tentatively designated Pita3(t) (supposed to be Pita2). To identify the Pita3(t), a total of 50 microsatellite and 12 position specific microsatellite markers distributed by two sides of the Pita gene were selected in the parent polymorphism screening. The results showed that PT4 and PT5 were co-segregated with the target gene. A contig map corresponding to the resistance gene and Pita genes was constructed based on the fine mapping and bioinformatics assay. The resistance gene, Pita3(t), was, thus, assumed to be in an interval of approximately 178 kb which containing a total of 5 NBS-LRR genes, and was about 500 kb away from the Pita gene.

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