Data/hora: 01/06/2024 02:17:14

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 06/04/2004
Data da última atualização: | 06/04/2004
Autoria: | ELIAS, M.; PANAUD, O.; MCKEY, D. B.; ROBERT, T.
Título: | Traditional cultivation of cassava among amerindians: consequences on genetic diversity assessed with AFLP markers.
Ano de publicação: | 1998
Fonte/Imprenta: | Revista Brasileira de Mandioca, Cruz das Almas, v. 17, p.16, nov., 1998. Suplemento.
Idioma: | Inglês
Conteúdo: | Abstract: Cassava (Manihot esculenta) is the most important crop cultivated by Amerindians in the Amazon. While cassava landraces have been the focus of genetic diversity, only a few preliminary studies have attempted to relate the observed patterns to traditional cultivation practices. Our goal is to carry out both genetic and ethnological approaches in a system of traditional cassava farming. Our study was based in Rewa, a Makushi community in Guyana (South America), where observations, participation in farming, and enquiries have been conducted. The local classification mentioned 76 names of cassava landraces. In order to study the relationships between the structure of molecular diversity in landraces and the local classification, we have assessed the genetic diversity of a sample of 30 landraces, using 5 accessions per landrace, with AFLP markers. 25 accessions representing a world collection were also included. Using 2 primers, we obtained 102 AFLP bands, of which 82 were polymorphic. We detected 74 different genotypes among the landraces. Given the vegetative multiplication of cassava, landraces would be expected to be clonal. However, only 11 were. Among the 19 polymorphic landraces, 13 were 'homogenous', i.e., the 5 individuals clustered together in an UPGMA dendrogram based on a Nei and Li distance matrix. The other 6 polymorphic landraces had individuals dispersed in the dendrogram. The landraces include genetic diversity not represented in the world collection. Mechanisms that could explain the high level of polymorphism, including use of volunteer seedlings and exchanges of cuttings, are discussed.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
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