Superação de dormência de sementes de baru (Dipteryx alata VOG.) sob diferentes métodos

Abstract

Dipteryx alata is a native tree species of the Brazilian Cerrado used as food, timber, medicinal, industrial, landscape and in the recovery of degraded areas. The reproductive process of the species is almost exclusively sexual via the use of its seeds. The objective of this study was evaluate differents methods in overcoming dormency of D. alata. The experimental design was a completely randomized, with six treatments and four replicates of 25 seeds. The methods used were: seeds without scarification; immersed in water at 80ºC for two minutes; stayed in refrigerator at 8ºC for 24 hours; immersed in water at environment temperature for 12 hours; scarified on the side of the embryonic axis with number 100 sandpaper and scarified on the side opposite to the embryonic axis with number 100 sandpaper. The evaluated characteristics were: percentage of seedling emergence, time of emergence, number of leaves, collection diameter and length of shoot. The seeds that were conditioned in refrigerator at 8ºC for 24 hours presented the highest means, 92%, of emergency. The lowest averages occurred in seeds that were immersed in water at 80ºC for 2 minutes, with 35% of emergency.