Diversification and evolution of the avirulence gene AVR-Pita1 in field isolates of Magnaporthe oryzae

文献类型： 外文期刊

第一作者： Dai, Yuntao

作者： Dai, Yuntao;Jia, Yulin;Dai, Yuntao;Correll, James;Wang, Xueyan;Wang, Yanli

作者机构：

关键词： Magnaporthe oryzae;Effector;Metalloprotease;Evolution;Signal recognition

期刊名称：FUNGAL GENETICS AND BIOLOGY （ 影响因子：3.495； 五年影响因子：3.831 ）

ISSN： 1087-1845

年卷期： 2010 年 47 卷 12 期

页码：

收录情况： SCI

摘要： Rice blast disease is the single most destructive plant disease that threatens stable rice production worldwide Race-specific resistance to the rice blast pathogen has not been durable and the mechanism by which the resistance is overcome remains largely unknown Here we report the molecular mechanisms of diversification and the instability of the avirulence gene AVR Pita1 in field strains of Magnaporthe oryzae interacting with the host resistance gene Pi to and triggering race-specific resistance Two-base pair insertions resulting in frame-shift mutations and partial and complete deletions of AVR-Pita1 were identified in virulent isolates Moreover a total of 38 AVR-Pita1 haplotypes encoding 27 AVR-Pita1 variants were identified among 151 avirulent isolates Most DNA sequence variation was found to occur in the exon region resulting in amino acid substitution These findings demonstrate that AVR-Pita1 is under positive selection and mutations of AVR-Pita1 are responsible for defeating race-specific resistance in nature Published by Elsevier Inc

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