Data/hora: 15/06/2024 14:49:53

Provedor de dados: | 86
País: | Brazil
Título: | Morphological and molecular diversity among cassava genotypes
Autores: | Mezette,Thiago Fonseca; Blumer,Caroline Groppo; Veasey,Elizabeth Ann.
Data: | 2013-05-01
Ano: | 2013
Palavras-chave: | Manihot esculenta; Genetic diversity; Germplasm; Microsatellites; Morphological traits.
Resumo: | The objective of this work was to characterize morphologically and molecularly the genetic diversity of cassava accessions, collected from different regions in Brazil. A descriptive analysis was made for 12 morphological traits in 419 accessions. Data was transformed into binary data for cluster analysis and analysis of molecular variance. A higher proportion of white or cream (71%) root cortex color was found, while flesh colors were predominantly white (49%) and cream (42%). Four accession groups were classified by the cluster analysis, but they were not grouped according to their origin, which indicates that diversity is not structured in space. The variation was greater within regions (95.6%). Sixty genotypes were also evaluated using 14 polymorphic microsatellite markers. Molecular results corroborated the morphological ones, showing the same random distribution of genotypes, with no grouping according to origin. Diversity indices were high for each region, and a greater diversity was found within regions, with: a mean number of alleles per locus of 3.530; observed and expected heterozygosity of 0.499 and 0.642, respectively; and Shannon index of 1.03. The absence of spatial structure among cassava genotypes according to their origins shows the anthropic influence in the distribution and movement of germplasm, both within and among regions.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000500007

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2013000500007
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.48 n.5 2013
Fonte: | info:eu-repo/semantics/openAccess