Data/hora: 02/06/2024 13:09:42

Provedor de dados: | 102
País: | Brazil
Título: | Genetic variation among pathogens causing "Helminthosporium" diseases of rice, maize and wheat
Autores: | WEIKERT-OLIVEIRA,RITA C. B.; RESENDE,M. APARECIDA DE; VALÉRIO,HENRIQUE M.; CALIGIORNE,RACHEL B.; PAIVA,EDILSON.
Data: | 2002-11-01
Ano: | 2002
Palavras-chave: | Bipolaris sorokiniana; Bipolaris oryzae; Bipolaris maydis; Exserohilum turcicum; PCR-RFLP; RAPD.
Resumo: | Twenty isolates of four fungal species, agents of "Helminthosporium" diseases in cereals, were collected from different regions: nine Bipolarisoryzae isolated from rice (Oryza sativa), seven B.sorokiniana from wheat (Triticum aestivum), two B. maydis, and two Exserohilumturcicum from maize (Zea mays). The strains were compared by PCR-RFLP and RAPD analysis. Size polymorphism among the isolates in the ITS region comprising the 5.8 S rDNA indicated genetic differences among the isolates, while a UPGMA phenogram constructed after the digestion of this region with restriction enzymes showed inter- and intra-specific polymorphism. The RAPD profiles indicated an expressive level of polymorphism among different species, compared with a low level of polymorphism among isolates of the same species. A UPGMA phenogram grouped the isolates according to the species and their host plant. RAPD profiles did not reveal polymorphism that directly correlated climatic factors with geographic source of the isolates of B. sorokiniana, and B. oryzae. Teleomorphic species revealed high similarity with their correspondent anamorphs.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000600015
Editor: | Sociedade Brasileira de Fitopatologia
Relação: | 10.1590/S0100-41582002000600015
Formato: | text/html
Fonte: | Fitopatologia Brasileira  v.27 n.6 2002
Fonte: | info:eu-repo/semantics/openAccess