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Population structure of P hytophthora infestans in C hina – geographic clusters and presence of the EU genotype Blue_13
Author(s) -
Li Y.,
Lee T.,
Zhu J. H.,
Jin G. H.,
Lan C. Z.,
Zhu S. X.,
Zhang R. F.,
Liu B. W.,
Zhao Z. J.,
Kessel G.,
Huang S. W.,
Jacobsen E.
Publication year - 2013
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.2012.02687.x
Subject(s) - phytophthora infestans , biology , mating type , haplotype , population , genotype , genetics , population genetics , propagule , genetic structure , sexual reproduction , gene flow , genetic variation , blight , botany , gene , demography , sociology
The population structure of P hytophthora infestans in China was studied and three mitochondrial haplotypes (Ia, II a, II b) were observed. Genetic analysis with 10 highly informative SSR markers identified 68 different genotypes, including three dominant clonal lineages. In the Chinese P . infestans population, the genotypes were strongly clustered according to their geographic origin. One of dominant clonal lineages was genetically similar to Blue_13, a dominant clonal lineage found in Europe since 2004. This is the first report of Blue_13 outside Europe. Only one mating type ( A 1) was found in the northern and southeastern provinces, but in southern and northwestern China both mating types were observed. The mating type ratio and SSR allele frequencies indicate that in China the sexual cycle of P . infestans is rare. These results emphasize that the migration of asexual propagules and the generation of subclonal variation are the dominant driving factors of the population structure of P . infestans in China. They may also have implications for the role of monitoring P. infestans populations in potato late blight management strategies in China.