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Provedor de dados:  PAB
País:  Brazil
Título:  Phenotypic virulence analysis of Pyricularia grisea isolates from Brazilian upland rice cultivars
Autores:  Filippi,Marta Cristina
Prabhu,Anne Sitarama
Data:  2001-01-01
Ano:  2001
Palavras-chave:  Pathotype
Oryza sativa
Magnaporthe grisea
Physiologic races
Pathogenicity
Resumo:  Phenotypic virulence analysis was made on population of Pyricularia grisea isolates collected from 10 upland cultivars in three distinct rice breeding sites, with the objective of studying the degree of similarity in the phenotypic virulence among the isolates, the composition of races, and their virulence pattern. Sixteen races were identified based on the reaction type on eight standard international differentials, the predominant ones being IB9 and IB41. The virulence frequency was high on IAC47 and IAC165 among medium and early maturing cultivars, respectively. The frequency of isolates virulent was greater on upland rice cultivars (51.1%) than on irrigated rice cultivars (21.8%). Both virulent and avirulent isolates were present in the population of P. grisea to the known genes in the near isogenic lines. Of72test isolates, 94.4% were virulent for genes Pi3 and Pi4a. Thevirulence frequencies were relatively lower in decreasing order on Pi1, Pi4b and Pi2. Thecoefficient of similarity ranged from 0.28 to1.0 among the isolates pertaining to different races, while within the race IB9, it varied from 0.56 to1.0. Considering the coefficient of similarity of 0.81, 72% of isolates of race IB9 exhibited similar pattern of virulence.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000100004
Editor:  Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira
Relação:  10.1590/S0100-204X2001000100004
Formato:  text/html
Fonte:  Pesquisa Agropecuária Brasileira v.36 n.1 2001
Direitos:  info:eu-repo/semantics/openAccess
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