贵州稻瘟病菌遗传宗谱的组成及时空分布特征

利用Rep-PCR分子指纹对2003~2004年采自贵州7个地区22个县(市)的200个稻瘟病菌菌株进行了遗传结构分析。在83%遗传相似水平下,供试菌株被划分为87个单元型,17个宗谱。从稻瘟病菌遗传宗谱的组成与分布来看,时空特性表现较为明显。在空间上,各地区既有相同的优势单元型和优势宗谱,又有自己的特异性单元型与宗谱,且各地区病菌群体遗传结构与该地区的水稻品种布局相关;在时间上,不同年度的稻瘟病菌在遗传上存在一定程度的亲缘关系,各年度的特异性宗谱因当年水稻品种的类型而异。

Formation, temporal and space distribution of genetic lineage of Magnapothe grisea in Guizhou

The genetic structure of two hundred strains of rice blast fungus collected from 22 counties of seven regions in Guizhou province were analyzed by using Rep-PCR fingerprinting technique.There were 87 different haplotypes,17 genetic lineages at 83 % similar linkage distance level.The rice blast population in Guizhou showed the obvious temporal and spatial characteristic according to the formation and distribution of its genetic lineages.In space distribution,there were the same predominant haplotypes and lineages,and distinctive haplotypes and lineages in different regions and the genetic structure of rice blast population was related to the arrangement of rice varieties.In temporal distribution,the strains from different years existed the blood relationship in genetic,and the special lineages of the current year also change with the change of rice varieties.