Myracrodruon urundeuva is one of the tree species the wood that presents the longest durability when in contact with soil. Because of this characteristic, populations of M. urundeuva have been decimated throughout Brazil. Therefore, this work aimed at analyzing the expression of genetic variation in a natural population of M. urundeuva from the Ecological Station of the Forest Institute, located in Paulo de Faria-SP. Seeds were collected from 30 free-pollination trees in September, 1996. By using this material, three progeny trials were installed in different planting systems in Selvíria - MS, following a block design with 30 treatments (progenies) and three replications. The mixed crossbreeding model for M. urundeuva was assumed. Significant differences were observed for progeny effects (progeny trials) although the progenies-environments interaction was not significant. Thus, progenies presented the same behavior in different environments; however, their best performance was in the planting involving M. urundeuva, Guazuma ulmifolia (Lam) and Anandenanthera falcata (Benth. Speg.). The progenies also presented considerable genetic variation; hence its utilization in programs for conservation and genetic improvement.
Myracrodruon urundeuva; genetic variability; genetic quantitative; genetic conservation
