Title:	Morphological and molecular diversity among cassava genotypes.
Authors:	MEZETTE, T. F. BLUMER, C. G. VEASEY, E. A.
Affiliation:	Thiago Fonseca Mezette, Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Genética; Caroline Groppo Blumer, Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Genética; Elizabeth Ann Veasey, Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Genética.
Date Issued:	2013
Citation:	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 48, n. 5, p. 510-518, maio 2013.
Description:	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.
Thesagro:	Germoplasma Manihot Esculenta
NAL Thesaurus:	Germplasm Genetic variation
Keywords:	Diversidade genética Microssatélite Morphological traits Genetic diversity Microsatellites
Notes:	Título em português: Diversidade morfológica e molecular entre genótipos de mandioca.
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado / Embrapa Unidades Centrais (AI-SEDE)