The Geographic Distribution and Natural Variation of the Rice Blast Fungus Avirulence Gene AVR-Pita1 in Southern China
文献类型： 外文期刊
作者： Chen, Xinwei 1 ; Liu, Xin 1 ; Hu, Xiaochun 1 ; Tu, Zhouyi 1 ; Fu, Jun 1 ; Zhong, Liping 6 ; Jiang, Nan 1 ; Yang, Yuanzhu 1 ;
作者机构： 1.Yuan Longping High Tech Agr Co Ltd, Key Lab Southern Rice Innovat & Improvement, Minist Agr & Rural Affairs, Changsha 410128, Peoples R China
2.Yuan Longping High Tech Agr Co Ltd, Hunan Engn Lab Dis & Pest Resistant Rice Breeding, Changsha 410128, Peoples R China
3.Hunan Normal Univ, Coll Life Sci, Changsha 410081, Peoples R China
4.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China
5.Yuelushan Lab, Changsha 410128, Peoples R China
6.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China
关键词：
rice;
期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）
ISSN： 2223-7747
年卷期： 2025 年 14 卷 8 期
页码：
收录情况： SCI
摘要： The avirulence (AVR) genes of the filamentous ascomycete fungus Magnaporthe oryzae (M. oryzae) are known to mutate rapidly under a higher selection pressure, allowing the pathogen to evade recognition by rice resistance (R) genes. Understanding the geographic distribution and natural variation of AVR genes is critical for the rational utilization and prolonging of the effectiveness of R genes. In this study, a total of 1060 M. oryzae strains collected from 19 rice blast nurseries in 13 provinces across southern China were subjected to presence/absence variation (PAV), genetic variation, and virulence analyses of the AVR-Pita1 gene. PCR amplification results indicated that AVR-Pita1 was present in only 57.45% of the blast strains, with significant geographic variation in distribution frequency. Specifically, the highest frequency (100%) was observed in strains from Chengmai, Hainan, while the lowest (1.79%) was observed in strains from Baoshan, Yunnan. A sequencing analysis identified 29 haplotypes of AVR-Pita1, characterized by insertions, deletions, and base substitutions. A phylogenetic analysis indicated that haplotypes of AVR-Pita1 identified in this study were clustered into one clade. A further amino acid sequence analysis of these haplotypes led to the identification of 25 protein variants. Notably, four haplotypes of AVR-Pita1 exhibited pathogenicity toward its corresponding rice R gene, PtrA. Additionally, we performed allele profiling of Ptr in a collection of elite parental lines that are widely used in rice breeding in southern China and found that the functional Ptr alleles (PtrA, PtrB, and PtrC) accounted for over 70%.
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