Genetic divergence among the commercials corns cultivars in low heigts in Tocantins harvest 2007/2008

Abstract

The Tocantins State has good soil and climatic conditions for the development of corn, but has low average productivity, which is mostly attributed to lack of specific genotypes in this environment and incorrect crop management. In this context were evaluated genetic diversity among corn cultivars under different climate conditions in Tocantins. The experiments were conducted in three locations, one in Gurupi-TO and two in Palmas-TO, both experimental areas belonging to the Universidade Federal of Tocantins. The experimental design was randomized blocks with four replications using 24 commercial corn cultivars. Genetic divergence was evaluated by multivariate analysis methods, and cultivars clustered based on the Mahalanobis generalized distance, and then used the Tocher optimization method. The cultivars showed genetic divergence in environment of Palmas-TO early planting, and the characteristics contributions influenced by genotype × environment interaction. Among the cultivars, the open pollination DSSCAMPEÃO and BR106 were the most divergent. Among the simple hybrids, DAS2B710 and XGN6370 were the most divergent.