文献类型： 外文期刊
作者： Lu, Lin 1 ; Wang, Qun 2 ; Shi, Zhufeng 2 ; Li, Chengyun 3 ; Guo, Zhixiang 2 ; Li, Jinbin 2 ;
作者机构： 1.Yunnan Acad Agr Sci, Flower Res Inst, Kunming 650205, Peoples R China
2.Yunnan Acad Agr Sci, Agr Environm & Resource Res Inst, Yunnan Key Lab Green Prevent & Control Agr Transbo, Kunming 650205, Peoples R China
3.Yunnan Agr Univ, Minist Educ Key Lab Agr Biodivers & Pest Managemen, Kunming 650200, Peoples R China
关键词： rice blast; virulence; polymorphism; monogenic resistance; landrace
期刊名称：LIFE-BASEL （ 影响因子：3.2； 五年影响因子：3.2 ）
ISSN：
年卷期： 2023 年 13 卷 6 期
页码：
收录情况： SCI
摘要： The rice blast disease (caused by Magnaporthe oryzae) is a devastating disease in China. Understanding the molecular mechanisms of interaction for the cognate avirulence (AVR) gene with host resistance (R) genes, as well as their genetic evolution is essential for sustainable rice production. In the present study, we conducted a high-throughput nucleotide sequence polymorphism analysis of the AVR-Pi9 gene that was amplified from the rice-growing regions of the Yunnan Province in China. We detected the presence of seven novel haplotypes from 326 rice samples. In addition, the sequences of AVR-Pi9 were also obtained from two non-rice hosts, Eleusine coracana and Eleusine indica. The sequence analysis revealed the insertions and deletions in the coding and non-coding regions of the gene. The pathogenicity experiments of these haplotypes on previously characterized monogenic lines showed that the newly identified haplotypes are virulent in nature. The breakdown of resistance was attributed to the development of new haplotypes. Our results suggest that the mutation in the AVR-Pi9 gene is an alarming situation in the Yunnan province and thus needs attention.
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