Variabilidade e estimação de parâmetros genéticos via modelos mistos em canafístula

Abstract

The aim of this study was to evaluate the variability and to estimate genetic parameters in canafístula progenies from Mato Grosso do Sul and Minas Gerais, as well as ordering the progenies with higher gain in future cycles of genetic selection. Seedlings of 64 canafístula progenies from Minas Gerais and Mato Grosso do Sul were planted in 2013 at the Experimental Farm of UFGD. The experimental design employed was alpha-lattice design with four replications with eight blocks, eight treatments per block and six plants per plot. The evaluated traits were plant height, diameter at breast height, number of forks, stem form and sanity. Estimates of genetic parameters and the deviance analysis were performed with computer program Selegen-REML/BLUP, computed as a randomized block design. In deviance analysis for progenies of Mato Grosso do Sul, there was significant effect of progeny only to the number of bifurcations, while in progenies of Minas Gerais there was no significant effect of progeny. The deviance conjoint analysis of procedence showed significant effect of procedence on plant height, diameter at breast height and number of forks at 18 months; plant height and the number of bifurcations 22 and 24 months. The genetic effects of procedence for plant height obtained in deviance analysis were significant in all three measurement periods. In general, values of individual heritability in restricted sense proved low, and values of progenies heritability average showed higher in both procedences. Progenies 61, 48 and 63, from Minas Gerais, and progeny 18, from Mato Grosso do Sul, were promising for future selections in breeding programs. For plant height there was a higher contribution from progenies of Minas Gerais, while for number of bifurcations there was a greater contribution of progenies of Mato Grosso do Sul. Plant height and diameter at breast height were the characteristics that were more conducive to selection at the stage where the plants were analyzed. In general, it was observed significant effects observed that the gene for canafistula progenies this study.