Germina??o de sementes de Stryphnodendron adstringens (Mart.) Coville de diferentes origens submetidas a tratamentos para supera??o de dormência

摘要

Seeds from different sources may present variation in dormancy intensity, responding differently to treatments and making it difficult to select the best dormancy breaking method. This work aimed to identify methods for breaking dormancy and promoting germination of Stryphnodendron adstringens seeds from differents origins. Seeds of Stryphnodendron adstringens were harvested at seven cerrado fragments in the Botucatu region (SP) and were submitted to the following treatments for breaking dormancy: control, mechanical scarification (with sand paper 220), boiling water for 20 minutes and acid scarification (with H2 SO4 95%) for 40, 60 and 80 minutes. Seeds were evaluated by water content, germination test, seedling length, and conductivity test. Scarification with sulphuric acid for 60 minutes was the most efficient treatment for breaking dormancy, accelerating and increasing germination percentage and resulting in seedlings with large size, for all the seeds from different origins.