Genetic characterization of Stryphnodendron pulcherrimum seeds under different temperature levels

The aims of this work were to estimate genetic parameters in Stryphnodendron pulcherrimum seeds under different temperatures and to indicate superior matrices for the production of seedlings, in order to subsidiary strategies for the domestication and breeding of the species. Seeds were collected from 21 matrices of S. pulcherrimum species from the city of Apui, Amazonas. The experiment was completely randomized, with four replications of 25 seeds. The germination test was conducted at temperatures of 25, 30 and 35 degrees C, during 20 days. Individual and joint analysis of variance was carried out and the genetic parameters and selection gains estimated for the following characters: percentage of germination, mean germination time, and the synchronization and germination speed indexes. Biometric analysis of the seeds was also considered. 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 at the temperature of 25 degrees C (92%), with decreasing germinated seeds and mean germination time with increasing temperature. Significant correlations favorable for selection among the characters make the selection process simpler, with progenies 11, 14 and 15 presenting good germination for milder and higher temperature conditions, being indicated for conservation programs, breeding and seedling production of the species.