EVALUATION OF Myracrodruon urundeuva Fr.All. PROGENIES FOR DIFFERENT PLANTING SYSTEMS AIMING AT GENETIC CONSERVATION

Abstract

Myracrodruon urundeuva is a highly explored native tree species. The objective of this work was to evaluate the genetic variation for silvicultural traits, survival and sex ratio, in two tests of progenies of Myracrodruon urundeuva, aiming to provide subsidies for ex situ conservation. Thirty progenies were analyzed in two progeny tests in different planting systems - mixed (TP-MUE) and homogeneous (TP-DES). The silvicultural characters evaluated were height (H), diameter at breast height (DBH), average crown diameter (DMC), survival (SOB), number of trees with male flowering (Nm), female flowering (Nf), monoecious trees (Mo) and without flowering (Sf). Estimates of genetic parameters were obtained using the REML / BLUP procedure. The SOB rate was high for both tests (> 80%). The mean for H ranged from 7.58 m (TP-MUE) to 10.02 m (TP-DES); for 8.24 cm DAP (TPMUE) to 10.91 cm (TP-DES). The heritability of the average of progenies varied from moderate to high (from 0.39 to 0.72). In the TP-MUE, the sex ratio was 2♂:1♀ and in the TPDES 4♂:1♀. The effective size (Ne) of the TP-MUE represented 38 % of the expected Ne and in the TP-DES it was 12 %. Therefore, there is genetic variability for ex situ genetic conservation of M. urundeuva in the short term.

Keywords

• Aroeira
• Genetic parameters
• Effective size
• Progeny test