Data/hora: 07/06/2024 16:56:29

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 06/04/2004
Data da última atualização: | 06/04/2004
Autoria: | RESTREPO, S; DUQUE, M. C; LOSADA VALE, T; VERDIER, V.
Título: | Genetic differentiation of Brazilian strains of xanthomonas axonopodis pv. manihotis by RFLP, AFLP e virulence analysis.
Ano de publicação: | 1998
Fonte/Imprenta: | Revista Brasileira de Mandioca,Cruz das Almas, v.17, p.42, nov., 1998. Suplemento.
Idioma: | Inglês
Conteúdo: | Abstract: Brazil considered as the major cassava-producing country in the world with 24 million tons. An important and limiing factor of cassava production in the South and Center of Brazil is the cassava bacterial blight disease (CBB) caused by Xanthomonas axonopodis pv. manihotis (Xam). This pathogen is characterid  by the induction of a wide combination of symptoms. The deployment of resistant varieties is the more appropriate and realistic approach to control the bacterial blight disease. For many years, the development and release of release germplasm has been limied due in part to lack of knowledge of the pathogens variability. The present study has been conducted in order to assess the genetic and pathogenic variation of Brazilian strains are originated from four major cassava growing regions corresponding to different edaphoclimatic zones (ECZ). A Xam population that was collected in different sites in São Paulo state (located in ECZ6) was more extensively studied. The Brazilian population was analyzed by RFLP, AFLP and a virulence analysis. A multiple correspondence analysis, used to evaluate the genetic relatedness among strains, and the measurement of genetic diversity indicated that the pathogen showed high levels of diverdity and geographical differentiation. Brazilian Xam strains were classified in 38 RFLP haplotypes. Virulence data were not linked to haplotypes groups. Patterns of migration of Xam strains within the São Saulo state were observed. AFLP fingerprinting allowed the assessment of the genetic - relationships between Xam strains The information we provide will be useful for the selection of a specific set of Xam strains for screening germplasm adapted to each region.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (20918-1) - ADD - AP - -- - 633.68205 -  -  - DIS