Genetic divergence in sweet cassava cultivars using morphological agronomic traits and RAPD molecular markers.

摘要

In this work the genetic divergence among 14 sweet cassava cultivars was estimated by their morphological agronomic traits and RAPD molecular markers. The Tocher cluster analysis and the Nearest Neighbor Method were applied. The most dissimilar cultivars were Pao and Guaira, Fecula Branca and Pao, and Pao and Caipira, while the most similar cultivar were the Fecula Branca and Branca 1, Branca 3 and Branca 1, and Guaira and Branca 1. The Jaccard's coefficient showed that the most similar cultivars were Guaira and Quarenta Quilos, while the most dissimilar were Branca 3 and Amarela da Rama Cinza. The divergence analysis indicated that promising crosses could be made between the Branca 3 cultivar and the Pao, Amarela 1, Fecula Branca and Amarela 2 cultivars for the high genetic divergence, favorable agronomic and culinary traits, and disease resistance on the part of at least one of the parents involved in the cross.