Data/hora: 10/06/2024 06:47:42

Provedor de dados: | 86
País: | Brazil
Título: | Hot spots for diversity of Magnaporthe oryzae physiological races in irrigated rice fields in Brazil
Autores: | Dias Neto,Justino José; Santos,Gil Rodrigues dos; Anjos,Liamar Maria dos; Rangel,Paulo Hideo Nakano; Ferreira,Marcio Elias.
Data: | 2010-03-01
Ano: | 2010
Palavras-chave: | Pyricularia; Pathogenicity; Pathotype; Race.
Resumo: | The objective of this work was to evaluate the Magnaporthe oryzae pathotype diversity in new commercial irrigated rice fields in the Araguaia River Valley, state of Tocantins, Brazil. The causal agent of rice blast has heavily affected rice production in the region. Despite the efforts of breeding programs, blast resistance breakdown has been recorded shortly after the release of new resistant cultivars developed for the region. Among the causes of resistance breakage is the capacity of the fungus to rapidly develop new pathotypes. A sample of 479 M. oryzae monosporic isolates was obtained and tested using the international rice blast differential set. Isolate collections were made in small areas designed as trap nurseries and in scattered sites in their vicinity. Analysis of 250 M. oryzae isolates from three trap nurseries indicated the presence of 45 international M. oryzae races belonging to seven pathotype groups (IA-IG). In the isolates tested, 61 M. oryzae pathotypes belonging to all but the IH group were detected. The new areas of irrigated rice in the Araguaia River Valley have the highest diversity of M. oryzae pathotypes reported so far in Brazil.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000300004

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2010000300004
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.45 n.3 2010
Fonte: | info:eu-repo/semantics/openAccess