Identification and fine mapping of a resistance gene to Magnaporthe oryzae in a space-induced rice mutant
文献类型: 外文期刊
第一作者: Xiao, Wuming
作者: Xiao, Wuming;Wang, Hui;Guo, Tao;Liu, Yongzhu;Chen, Zhiqiang;Yang, Qiyun;Zhu, Xiaoyuan
作者机构:
关键词: K67 marker;T94 marker;RM224;RM27360;disease resistance
期刊名称:MOLECULAR BREEDING ( 影响因子:2.589; 五年影响因子:2.75 )
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年卷期:
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收录情况: SCI
摘要: Finding novel sources of resistance (R) to rice blast disease should facilitate breeding for improved resistance. The objectives of the present study were to evaluate reactions to blast and identify in a space-induced mutant an R gene to a representative isolate of rice blast pathogen. The mutant H4, its parent and twelve monogenic lines were evaluated for their responses to 35 isolates collected from Guangdong Province, China. H4 was found to be resistant to more isolates than its parent and the twelve monogenic lines, suggesting newly acquired resistance may be a function of one or more R genes. A representative isolate GD0193 was used to identify and map the R gene from H4. Genetic analysis revealed that resistance to the isolate GD0193 was controlled by a single dominant gene, designated Pi46(t). Linkage analysis using susceptible F2 individuals showed that Pi46(t) was mapped between the markers RM224 and RM27360 within 1.04 and 1.2 cM on the long arm of chromosome 11. Subsequently, Pi46(t) was delimited to an interval of approximately 183.7 kb flanked by the markers K67 and T94. These results provide essential information for the cloning of the Pi46(t) gene and will facilitate marker-assisted selection in rice breeding.
分类号: Q94
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