Data/hora: 14/06/2024 12:19:14

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 06/04/2004
Data da última atualização: | 06/04/2004
Autoria: | CARVALHO, L. J. C. B; SCHAAL, B. A; FUKUDA, W. M. G.
Afiliação: | Embrapa Mandioca e Fruticultura, Cruz das Almas.
Título: | Cassava (Manihot esculenta CRANTZ) phenetic relationships and genetic diversity revealed by morphological descriptors and rapd markers.
Ano de publicação: | 1998
Fonte/Imprenta: | Revista Brasileira de Mandioca, Cruz das Almas, v.17, p.13, nov., 1998., Suplemento.
Idioma: | Inglês
Conteúdo: | Abstract: Morphological descriptors and Random Amplified Polymorphic DNA (RAPD) marker were used to assess the genetic diversity of cassava (Manihot esculenta Crantz). Ninety four cassava accessions, three major morphological descriptors (determined  by PCA) and 96 polymorphic bands were analyzed by the mean of phenetic relationship. Cluster groups generated with jaccard similarity index by UPMGA method were furthe analyzed by the consensus tree method to assess the distinctness of the clusters indentified by UPGMA-derived phenogram. Genetic diversity of the morphological groups was assessed by the meaning of the estimated value of nucleotide   diversity. The grouping pattern implied by the phenogram generated with UPGMA method showed different degree of resolution (truly bifurcated phenogram), different levels of tree imbalance, and no group correspondence between the two markers. A consensus fork index (Clc) value of 0.41 and 0.22 as well as the Mickevich's index (Clm) values of 0.03 and 0.01 were observed for morphological and RAPD markers respectively. Morphological descriptores revealed 22 distinct clusters of accessions with high resolution, while the RAPD markers revealed 18 distinct clusters with low resolution and high group imbalance. None of the cultivars clustered by one king of marker was clustered the same way by the other marker. The correlation between the cluster groups obtained by the two markers was very low (r=0.077) and not statistically significant. The genetic diversity among accessions in the morphological distinct clusters revealed by nucleotide diversity showed a nucleotide variation per site varying from 0.326 to 2.779 percent.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (20910-1) - ADD - AP - -- - 633.68205 -  -  - DIS