Overcoming seed dormancy mororó (Bauhinia forficata Linn.)

Abstract

The mororo(Bauhinia forficata Linn) belongs to the subfamily Caesalpinaceae and presents different purposes. The breaking of dormancy is a mechanism for facilitating the perpetuation of the species, however, is a limiting factor for its spread, due to the low percentage of germination, before the goal of this study was to test different methods for overcoming seed dormancy of B. forficata L., using the following treatments: T1 - control, T2 - mechanical scarification on the side of the seeds with sandpaper to mass number 120, followed by immersion in water for 24 hours, T3 - mechanical scarification on the side of the seeds with sandpaper tomass number 120, without immersion in water, T4 - intact seeds subjected to water immersion for 24 hours at room temperature T5 - soaking seeds in water at 80 ° C by cooling; T6 - soaking seeds in water at 90 ° C to cooling, T7 - ​​soaking seeds in water at 100 ° C by cooling; T8 - chemical scarification in concentrated sulfuric acid for 5 minutes; T9 - chemical scarification in concentrated sulfuric acid for 10 minutes; T10-chemical scarification in concentrated sulfuric acid for 15 minutes in the treatments with chemical scarification in sulfuric acid after the appointed time the seeds were washed in running water for 5 minutes. We used a completely randomized design (CRD) with 10 treatments and for each treatment four replicates was used, consisting of 25 seeds, totaling 100 seeds per treatment. The parameters evaluated were: percentage of germination (% G), First Count (%) and germination speed index (IVG). The treatment means were compared by Scott-Knott test at 5% probability. Treatments that provided the best results for germination of B. forficata L., were mechanical scarification with and without immersion in water and chemical scarification with sulfuric acid for five minutes.