Parâmetros genéticos em progênies de Peltophorum dubium em Dourados - MS, via REML/BLUP

Abstract

The Peltophorum dubium (Sprengel) Taubert is a perennial plant belonging to the Fabaceae family and native to the Brazilian cerrado. It can be used in wooden stakes, tannin production (potential item), cellulose, civil construction, furniture manufacturing and medicinal plant in the form of tea, among others. Considering the possibility of use and the importance of the species in Mato Grosso do Sul, it is necessary to study the genetic variability in populations aiming at implementing Plant Breeding Programs to obtain progenies with better silvicultural characteristics. Thus, the objective of the present work was to investigate the variability and estimate genetic parameters in canafistula progenies sown in Dourados - MS regarding silvicultural characteristics, aiming to find an evaluative character that can be used to select progenies for a possible breeding program. The experiment was installed in 2013 at the Federal University of Grande Dourados, in Dourados – MS, Brazil. The experimental design used was 8x8 alpha-lattice, with 64 progenies and three repetitions in 3x2m spacing. The plots were composed of six plants. The characteristics evaluated were diameter at breast height (DAP, in cm) and indirectly calculated the basal area (AB, in cm²) at ages eight, nine and ten. Bifurcations (BIF) and survival (SOBRE) at the age of ten. The geneticstatistical analyzes were performed using the procedure REML/BLUP, with deviance analysis, obtaining estimates of genetic parameters and prediction of genetic values. Genetic variability was detected in the progenies for AB and DAP at ages eight, nine and ten and SOBRE at the age of ten. For the characteristic AB and SOBRE there is a greater possibility of success with the selection, especially if performed considering the average of the progenies. Survival is an interesting feature, as it demonstrates individuals who are more resistant to the adversities of the field. Tree species spend a long period in the field until they reach the commercially desired physiological maturity and in the present work, the progenies had not yet reached the point of physiological maturity.