Estimativa de parâmetros genéticos em sementes de Jacaranda copaia (Aubl.) D. Don

Abstract

Amazonian forest species lack of studies on estimates of genetic parameters and prediction of genetic gains. Jacaranda copaia (Aubl.) D. Don. Is belonging to the Bignoniaceae family and obtain populations with fast and uniform germination are highly desirable features and would contribute to the kind of seedling production system. The objective of this study was to estimate genetic parameters for seed germination characters in J. copaia. Data collection was conducted in the campus of the Federal University of Amazonas, Manaus-AM and the experiment was conducted in the laboratory of Native Seed Centre of the Amazon / UFAM. The experiment was conducted in a completely randomized design, consisting of 24 progenies in five replicates of 20 seeds per share, totaling 100 seeds. Was conducted in environments with temperatures of 25 ° C and 28ºC. Was performed the analysis of individual and combined variance for the characters: Germination test (TG), First Count of germination (PCG), germination speed index (GSI), coefficient of germination rate (CVG) and the mean germination time (GMT). For all characters and environments considered, the variances and genetic and phenotypic correlations were estimated, the genetic variation coefficient, the heritability in the broad sense, the gain by direct selection and the gain based on different levels of selection. All statistical analyzes were performed using the program Genes - UFV. At the analysis of individual and combined variance, there was a significant effect (P <0.05) genotype, indicating the possibility of selection of superior plants for the production system species of plants. The progenies 4, 6, 7 and 21 showed the highest averages for most traits under study, being recommended for the supply of seed for conservation and seedling production programs. Direct selection in any of the characters allowed to obtain satisfactory indirect gains in all other characters as well as the use of selection indexes can be an effective strategy in the improvement of the species