Data/hora: 17/06/2024 13:38:05

Provedor de dados: | 102
País: | Brazil
Título: | Virulence pattern of Pyricularia grisea isolates from farmers' fields on newly released upland rice cultivars
Autores: | Araújo,Leila G.; Prabhu,Anne S.; Silva,Gisele B. da.
Data: | 2005-12-01
Ano: | 2005
Palavras-chave: | Oryza sativa; Magnaporthe grisea; Rice blast; Physiologic races; Resistance.
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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000600009
Editor: | Sociedade Brasileira de Fitopatologia
Relação: | 10.1590/S0100-41582005000600009
Formato: | text/html
Fonte: | Fitopatologia Brasileira  v.30 n.6 2005
Fonte: | info:eu-repo/semantics/openAccess