title: [Analysis of genetic structure of Magnaporthe grisea in the fields of different rice varieties].
abstract: The DNA of 251 Magnaporthe grisea isolates from Shiping County, which originated from monoculture and mixture fields, was extracted and amplified by rep-PCR which primer was from palindromes Pot2 of Magnaporthe grisea. The result showed that all isolates were amplified 9-17 DNA bands, the size was about from 400 bp to 23 kb, but mainly between 5-10 kb. 65% bands were polymorphism bands, and 35% were the same bands. Genetic structures of Magnaporthe grisea in the different rice varieties fields were compared by clustering analysis. The complexions of isolates genetic lineages were related to culture patterns. There were more genetic lineages in mixture field than in monoculture one. The dominant lineages were not distinct in mixture field. The result proved that biodiversity might provide a convincing basis for the steady selection of rice variety to pathogen.
authors.affiliation: Key Laboratory for Plant Pathology of Yunnan Province, Yunnan Agricultural University, Kunming 650201, China. hexiahong@hotmail.com
authors.forename: Xiahong
authors.initials: X
authors.lastname: He
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.forename: Yunyue
authors.initials: Y
authors.lastname: Wang
authors.forename: Huiping
authors.initials: H
authors.lastname: Zhou
authors.forename: Jianbin
authors.initials: J
authors.lastname: Chen
authors.forename: Zuosen
authors.initials: Z
authors.lastname: Li
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Youyong
authors.initials: Y
authors.lastname: Zhu
mesh_terms: D040342:Genetic Structures; D020082:Magnaporthe / Q000235:genetics*; D012275:Oryza / Q000382:microbiology*; D016133:Polymerase Chain Reaction