GERMINAÇÃO E QUEBRA DE DORMÊNCIA DE SEMENTES DE Enterolobium contortisiliquum (Vell.) Morong (TAMBORIL)

Abstract

The Tamboril (Enterolobium contortisiliquum (Vell.) Morong) occurs naturally in the Savana and Atlantic Forest. Studies of the species are scarce in the literature, on this the aim of the research was to study the germination and dormancy of seeds of E. contortisiliquum. The fruits were collected from ten trees headquarters in the city of Urutaí-GO and then was made the characterization of fruits and seeds. The moisture seeds was determined by the oven method. We used two substrates on germination (paper and autoclaved sand) at different temperatures (20, 25, 30, 35, 20-30 ° C) in a germination chamber. After determining the outcome of germination was established the following treatments to overcome dormancy: mechanical scarification with sandpaper, immersion in sulfuric acid 75% for 20 minutes, immersion in sulfuric acid 100% for 20 minutes immersion in gibberellic acid 100 and 200 ppm during (6, 12 and 24 hours), immersion in water for 72 hours, immersion in hot water for 2 minutes. After the treatments the seeds were germinated. The substrate which obtained the highest germination percentage was autoclaved sand alternating temperature of 20- 30 °C, resulting in the end of the test 63% germina tion. The scarification with sandpaper and immersion in hot water provided the best results of germination. We conclude that E. contortisiliquum presents impermeability of the seed coat to water, requiring pretreatment to accelerate germination, being nominated will soaking the seeds in hot water for 2 minutes to overcome dormancy due to its convenience and low cost.