Par?￠metros gen??ticos e sele?§?￡o inicial de proced?ancias e prog?anies de taxi-branco (Tachigali vulgaris) em Roraima

摘要

This study aimed to estimate the genetic parameters of open-pollinated Tachigali vulgaris provenances and progenies and select superior genotypes for initial growth in the field. The experiment was conducted in Campo experimental Serra da Prata which belongs to Embrapa Roraima and is located in the municipality of Mucaja?- - RR. The experimental design used was randomized blocks with 28 progenies from three provenances and 20 repetitions. Each experimental plot consisted of a single plant. At 6, 12 and 18 months after planting, the survival rate (%), the height of the plant (ALT; m), the diameter of the stem 10 cm above ground (DC; mm) or the diameter at breast height (DAP: m) were evaluated. The genetic-statistical analyses were performed using the REML/BLUP procedure, with analysis of deviance, estimation of genetic parameters and prediction of genetic values at the different stages. The overall survival rate varied from 50.68% to 62.10% at 18 months and 6 months, respectively. The only significant differences were between progenies, for ALT and DC, at six months after planting. Except for the evaluated DAP at 18 months after planting, the other estimations of individual narrow sense heritability were moderated, being lower than the estimates of progenies average heritability. The gains with the selection of progenies and plants were from low to moderate and varied between each evaluated stage, decreasing with the increasing plant age.