Phenotypic and molecular characterization of industrial purpose cassava accessions with potential for adaptation to the conditions of Cerrado of Central Brazil

Eduardo Alano Vieira, Josefino de Freitas Fialho, Fabio Gelape Faleiro, Graciele Bellon, Kenia Graciele da Fonseca, Marilia Santos Silva, Silvana Vieira de Paula-Moraes, Luiz Joaquim Castelo Branco Carvalho

Abstract


The aim of the present work was to characterize and estimate the genetic variability among industrial purpose cassava accessions, with potential for adaptation to the conditions of Cerrado of Central Brazil, by means of quantitative and qualitative characters, and molecular markers through isolated and joint analysis, as well as to establish the correlation among the estimated indexes obtained by each used methodology. Sixteen industrial purpose cassava accessions with potential for adaptation to the conditions of Cerrado of Central Brazil were evaluated in field conditions in terms of 11 quantitative characters and 33 qualitative characters, in an experiment carried out at Embrapa Cerrados. The accessions were also evaluated through RAPD markers in laboratorial conditions. Afterwards, the matrices of genetic dissimilarity/distance among the accessions were estimated through qualitative characters, quantitative characters and molecular markers, besides through the joint analysis of the obtained data. Moreover, the association among the matrices was estimated. The results revealed existence of high variability among the accessions in terms of quantitative, qualitative and molecular characters evaluated. The only significant correlations found were between (i) the dissimilarity matrix estimated through joint analysis and the dissimilarity matrix estimated through qualitative data (r = 0,52); and (ii) the dissimilarity matrix estimated through joint analysis and the dissimilarity matrix estimated through molecular markers (r = 0,75). The weak association between these measures indicated that the best strategy to guide conservation actions and use of cassava industry germplasm is through studies of genetic divergence by the use of molecular markers, qualitative and quantitative traits in a joint and complementary way.


Keywords


Manihot esculenta Crantz; Genetic resources; Breeding; Genetic distance; Starch.



DOI: http://dx.doi.org/10.5433/1679-0359.2013v34n2p567

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional