| Registro completo |
| Provedor de dados: |
Trop. Plant Pathol.
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| País: |
Brazil
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| Título: |
Virulence pattern of Pyricularia grisea isolates from farmers' fields on newly released upland rice cultivars
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| Autores: |
Araújo,Leila G.
Prabhu,Anne S.
Silva,Gisele B. da
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| Data: |
2005-12-01
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| Ano: |
2005
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| Palavras-chave: |
Oryza sativa
Magnaporthe grisea
Rice blast
Physiologic races
Resistance
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| Resumo: |
The virulence pattern of the isolates of Pyricularia grisea from commercial fields of the upland rice (Oryza sativa) cultivars 'Primavera' and 'BRS Bonança' was analyzed. A hundred and seventy monoconidial isolates of the pathogen virulent to 'Primavera' and 139 to 'BRS Bonança' collected from eight fields, during two years (2001-2003) were tested, under greenhouse conditions, on six newly released rice cultivars. Differences in virulence pattern were observed in pathogenic populations of 'Primavera' and 'BRS Bonança'. Isolates with virulence to improved cultivars were common in samples from farmers' fields in the absence of aloinfection. The virulence frequency of P. grisea isolates collected from 'Primavera'' to cultivars 'BRS Vencedora', 'BRS Colosso', 'BRS Liderança', 'BRS Soberana', 'BRS Curinga' and 'BRS Talento', was high in descending order. On the other hand, in the fungus population of 'BRS BRS Bonança' virulence frequency was high in 'BRS Talento', followed by 'BRS Curinga', 'BRS Vencedora', 'BRS Liderança', 'BRS Colosso' and 'BRS Soberana'. While virulence to 'BRS Talento' was rare among isolates from 'Primavera', it was most frequent in isolates of 'BRS Bonança'. The six improved rice cultivars permitted to differentiating agriculturally important virulences in the pathogen population which can be utilized in selecting breeding lines for specific resistance, in rice blast improvement program.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000600009
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| Editor: |
Sociedade Brasileira de Fitopatologia
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| Relação: |
10.1590/S0100-41582005000600009
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| Formato: |
text/html
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| Fonte: |
Fitopatologia Brasileira v.30 n.6 2005
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| Direitos: |
info:eu-repo/semantics/openAccess
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