Estimativa de parâmetros genéticos em caracteres de sementes de Stryphnodendron pulcherrimum sob diferentes níveis de temperatura

Abstract

The aims of this work were to estimate the genotypes of Stryphnodendron pulcherrimum under different temperatures, besides indicating superior matrices for the production of seedlings, a subsidiary strategy for the domestication and breeding of the species. Seeds were collected from 21 matrices of S. pulcherrimum from the city of Apuí, Amazonas. The experiment was completely randomized, with four replications of 25 seeds. The germination test was conducted at temperatures of 25, 30 and 35 ° C, during 20 days. In The individual and joint analyzes of variance, estimative of genetic parameters and selection gain were chosen for percentage of germination, mean germination time, and the rates of synchronization and germination speed were determined. The presence of genetic variability and high heritability values and selective accuracy (> 69%) for all germination traits suggest that the phenotypic value may provide a reliable measure for the selection of superior genotypes. The highest percentage of germination was obtained in the environment of 25 ° C (92%), with decreasing germinated seeds and mean germination time with increasing temperature. Significant correlations between the characters and the favorable selection make the selection process simpler, with progenies 11, 14 and 15 presenting good germination conditions for all analyzed environments. Fourteen seeds of S. pulcherrimum are sufficient to perform the biometric analyzes with good accuracy in the selection of superior genotypes.

Keywords: Progeny test; Native forest species; Selection gain; Seed