Parâmetros genéticos em progênies de meio-irmãos para caracteres de emergência e crescimento inicial de Dipteryx alata Vogel e Handroanthus heptaphyllus (Vell.) Mattos em viveiro

Abstract

Knowledge of the genetic variability by measuring biometric characters can be one of the alternatives to aid in genetic conservation programs and also in forest breeding programs. In the present study aimed to analyze and estimate genetic parameters, genetic correlations between emergency character and initial growth of D. alata and H. heptaphyllus in nursery. The design for all experiments were randomized blocks and 28 treatments. For D. alata were five plants per plot and five blocks and H. heptaphyllus were six blocks and six plants per plot. On 30 days for emergency were evaluated percentage, average time and emergence speed index and the seedlings of D. alata (30 days): suvirvor, shoot height (cm); stem diameter (cm). After 140 days the following variables were evaluated: survival; shoot height (cm); root length ( cm ); stem diameter (cm), dried mass (leaves, stems and roots) ( g ) for H. heptaphyllus. The characters were analyzed using mixed model methodology, REML (Restricted Maximum Likelihood)/BLUP (Best Linear Unbiased Prediction). It was applied to the test progenies of half- sib, design of randomized blocks, several plants per plot, according to the pattern 1 SELEGEN - REML / BLUP software for H. heptaphyllus and D. alata seedlings, was used for emergency model 95. Individual heritability values and medium progenies accuracy, the coefficients of individual and experimental genetic variation were considered high for D. alata seedlings. Individual heritability values and average of progenies, selective accuracy obtained was of high magnitude for most characters, the coefficients of individual and experimental genetic variation were considered high for H. heptaphyllus seedlings. The values of individual heritability and average of progenies, selective accuracy for IVE character were of the highest magnitude. Thus the results indicate that there is genetic variability for all traits for H. heptaphyllus seedlings and there is genetic variability for the IVE characters for emergency and height of the area for seedlings of D. alata.