Genetic Structure of Populations of the Rice-Infecting Pathogen Rhizoctonia solani AG-1 IA from China


Autoria(s): Bernardes-de-Assis, Joana; Storari, Michelangelo; Zala, Marcello; Wang, Wenxiang; Jiang, Daohong; Li ShiDong,; Jin, Meisong; McDonald, Bruce A.; Ceresini, Paulo C.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/09/2009

Resumo

Sheath blight disease (SBD) on rice, caused by Rhizoctonia solani AG-1 IA, is one of the most devastating rice diseases on a global basis, including China (in Eastern Asia), the world's largest rice-growing country. We analyzed the population genetics of nine rice-infecting populations from China using nine microsatellite loci. One allopatric population from India (Southern Asia) was included in the analyses. In total, 300 different multilocus genotypes were found among 572 fungal isolates. Clonal fractions within rice fields were 16 to 95%, suggesting that sclerotia were a major source of primary inoculum in some fields. Global Phi(ST) statistics (Phi(ST) = 42.49; P <= 0.001) were consistent with a relatively high level of differentiation among populations overall; however, pairwise comparisons gave nonsignificant R(ST) values, consistent with contemporary gene flow among five of the populations. Four of these populations were located along the Yangtze River tributary network. Gene flow followed an isolation-by-distance model consistent with restricted long-distance migration. Historical migration rates were reconstructed and yielded values that explained the current levels of population subdivision. Except for one population which appeared to be strictly clonal, all populations showed evidence of a mixed reproductive mode, including both asexual and sexual reproduction. One population had a strictly recombining structure (all loci were in Hardy-Weinberg equilibrium) but the remaining populations from China and the one from India exhibited varying degrees of sexual reproduction. Six populations showed significant F(IS) values consistent with inbreeding.

Formato

1090-1099

Identificador

http://dx.doi.org/10.1094/PHYTO-99-9-1090

Phytopathology. St Paul: Amer Phytopathological Soc, v. 99, n. 9, p. 1090-1099, 2009.

0031-949X

http://hdl.handle.net/11449/10275

10.1094/PHYTO-99-9-1090

WOS:000268876800011

Idioma(s)

eng

Publicador

Amer Phytopathological Soc

Relação

Phytopathology

Direitos

openAccess

Tipo

info:eu-repo/semantics/article