Data/hora: 12/06/2024 08:39:38

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 08/09/2016
Data da última atualização: | 27/04/2020
Autoria: | D'ÁVILA, L. S.; LEHNER, M. S.; FILIPPI, M. C. C.; SCHEUERMANN, K. K.; DEL PONTE, E. M.
Afiliação: | LEILANE S. D'AVILA, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL, Porto Alegre-RS; MILLER S. LEHNER, UNIVERSIDADE FEDERAL DE VIÇOSA; MARTA CRISTINA CORSI DE FILIPPI, CNPAF; KLAUS K. SCHEUERMANN, EPAGRI; EMERSON M. DEL PONTE, UNIVERSIDADE FEDERAL DE VIÇOSA.
Título: | Genetic structure and mating type analysis of the Pyricularia oryzae population causing widespread epidemics in southern Brazil.
Ano de publicação: | 2016
Fonte/Imprenta: | Tropical Plant Pathology, Brasília, DF, v. 41, n. 6, p. 297-305, Oct. 2016.
DOI: | 10.1007/s40858-016-0101-9
Idioma: | Inglês
Conteúdo: | Blast is a major disease of rice in Brazil, the largest rice-producing country outside Asia. This study aimed to assess the genetic structure and mating-type frequency in a contemporary Pyricularia oryzae population, which caused widespread epidemics during the 2012/13 season in the Brazilian lowland subtropical region. Symptomatic leaves and panicles were sampled at flooded rice fields in the states of Rio Grande do Sul (RS, 34 fields) and Santa Catarina (SC, 21 fields). The polymorphism at ten simple sequence repeats (SSR or microsatellite) loci and the presence of MAT1-1 or MAT1-2 idiomorphs were assessed in a population comprised of 187 isolates. Only the MAT1-2 idiomorph was found and 162 genotypes were identified by the SSR analysis. A discriminant analysis of principal components (DAPC) of SSR data resolved four genetic groups, which were strongly associated with the cultivar of origin of the isolates. There was high level of genotypic diversity and moderate level of gene diversity regardless whether isolates were grouped in subpopulations based on geographic region, cultivar host or cultivar within region. While regional subpopulations were weakly differentiated, high genetic differentiation was found among subpopulations comprised of isolates from different cultivars. The data suggest that the rice blast pathogen population in southern Brazil is comprised of clonal lineages that are adapting to specific cultivar hosts. Farmers should avoid the use of susceptible cultivars over large areas and breeders should focus at enlarging the genetic basis of new cultivars.
Palavras-Chave: | Microsatelite.
Thesagro: | Arroz; Brusone; Doença de planta; Fungo; Oryza sativa; Pyricularia oryzae.
Thesaurus Nal: | Blast disease; Magnaporthe oryzae; Microsatellite repeats; Population structure.
Categoria do assunto: | H Saúde e Patologia
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (34463-1) - UPC - AP - DD - 2016 -  - 2016 - DIS