Superação de dormência em sementes de Zeyheria montana Mart.

Abstract

Zeyheria montana Mart. (Bignoniaceae) is a medicinal species known as "bolsa de pastor" which found itself in of extinction, being essential the development of methodologies for its propagation and preservation. In this study, one evaluated the percentage of germination and speed germination index from "bolsa de pastor" seeds submitted to different methods of scarification: washing for different periods, partial and total removal of ala expansion, combination of washing with partial and total removal of ala expansion and, immersion in cloridric and sulfuric acid in different concentrations. The intact seeds were used as control. The experiment was conducted in germination chamber, BOD model, regulated at 25°C, 12 hours photoperiod and RH at 100%. Seeds submitted to washing in taping water for 6 hours with the partial removal of ala expansion showed higher vigor and germination percentage in relation to other treatments. The results suggest that the cause of dormancy in seeds of this species is complex, being caused by the embrionary stretching and possible presence of inhibitors.