2007-2008年江苏省稻瘟病菌遗传多样性

Genetic Diversity of Magnaporthe grisea from Rice in Jiangsu in 2007 and 2008

利用致病性测定及Pot2-rep-PCR技术对2007、2008年采集自江苏省五大稻区的稻瘟病菌株进行多样性分析,这2年的菌株被划分为10个小种和14个系谱,其中ZG1为优势小种,JSL5为优势系谱,研究结果表明:江苏稻瘟病菌具有丰富的多样性,但与1999-2002年的群体结构比较时发现,群体结构趋于简单;对病原菌的时空分布分析发现,不同的年份、不同的地区之间稻瘟菌的群体结构差异明显;结合致病型与遗传系谱分析时发现,致病类型与遗传系谱并没有一一对应的关系,但致病性和遗传系谱的地区变化有一定的相似性,这说明致病性和DNA分子水平上多态性检测在宏观上具有共同点,在一定程度上都能反映稻瘟病菌的多样性。

Pathogenicity determination and Pot2rep-PCR techniques were used to analyze the diversity of Magnaporthe.grisea from Jiangsu in 2007 and 2008,respectively.They were divided into 10 Physiological race and 14 lineages,in which ZG1 and JSL5 are dominant.The results showed that the rice blast fungus are rich in diversity in Jiangsu,but when compared with the group structure of 1999-2002,it tends to be more simple;By analyzing temporal and spatial distribution of M.grisea,we found that Population structure of M.grisea varied significantly between years and diferent rice cultivation areas of Jiangsu;By combining pathotypes and genetic lineages analysis,no obvious corresponding relationship was found between them.There is a certain similarity in region variations between pathotypes and genetic lineages,which indicated that there is something in common between pathotypes and DNA polymorphism examination at the macro-level,therefore,to a certain extent,they can reflect the diversity of Magnaporthe grisea all.