文献类型： 外文期刊
作者： Li, Jinbin 1 ; Lu, Lin 2 ; Jia, Yulin 3 ; Li, Chengyun 4 ;
作者机构： 1.Yunnan Acad Agr Sci, Agr Environm & Resources Res Inst, Kunming 650205, Yunnan Province, Peoples R China
2.Yunnan Acad Agr Sci, Flower Res Inst, Kunming 650205, Yunnan Province, Peoples R China
3.USDA ARS, Dale Bumpers Natl Rice Res Ctr, Stuttgart, AR USA
4.Yunnan Agr Univ, Minist Educ, Key Lab Agr Biodivers & Pest Management, Kunming 650201, Yunnan Province, Peoples R China
期刊名称：PHYTOPATHOLOGY （ 影响因子：4.025； 五年影响因子：4.394 ）
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收录情况： SCI
摘要： Rice blast is one of the most damaging diseases of rice worldwide. In the present study, we analyzed DNA sequence variation of avirulence (AVR) genes of AVR-Pita1 in field isolates of Magnaporthe oryzae in order to understand the effectiveness of the resistance gene Pi-ta in China. Genomic DNA of 366 isolates of M. oryzae collected from Yunnan province of China were used for polymerase chain reaction (PCR) amplification to examine the existence of AVR-Pita1 using gene-specific PCR markers. Results of PCR products revealed that 218 isolates of M. oryzae carry AVR-Pita1. Among of them, 62.5, 56.3, 58.5, 46.7, 72.4, and 57.4% of M. oryzae carry AVR-Pita1 from northeastern, southeast, western, northwest, southwestern, and central Yunnan province, respectively. The detection rate of AVR-Pita1 was, in order: southwestern > northeastern > western > central > southeastern > northwestern Yunnan province. Moreover, in total, 18 AVR-Pita1 haplotypes encoding 13 novel AVR-Pita1 variants were identified among 60 isolates. Most DNA sequence variation was found to occur in the exon region, resulting in amino acid substitution. Six virulent haplotypes of AVR-Pita1 to Pita were identified among 60 field isolates. The AVR-Pita1 has evolved to virulence from avirulent origins via base 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
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