Utilização de diferentes tratamentos pré-germinativos para superação de dormência em sementes de Adenanthera pavonina L.

Abstract

ABSTRAC: The propagation of forest species used for reforestation or ornamentation can be done through seeds, which may have dormancy, not favoring the germination process. Therefore, the present work aimed to evaluate different treatments of dormancy overcoming in A. pavovina L. seeds. The seeds were collected in three matrices in the city of Serra Talhada-PE, and subjected to different dormancy: control; soaking in water at room temperature for 48 hours; immersion in water at a temperature of 100 ºC for 10 seconds and subsequent conditioning in the freezer for 6 hours; manual scarification with nº. 120 sandpaper on both sides and opposite to the hilum; immersion in NaClO (2.5%) for 24 hours; soaking 30% caustic soda solution for 30 minutes. The seeds were sown in two hundred cell Styrofoam trays using medium-sized vermiculite as substrate. The experimental design was completely randomized, consisting of six treatments and four replications of twenty seeds. The parameters analyzed were emergency percentage (PE); emergency speed index (IVE) and mean emergency time (TME). With manual scarification treatment with sandpaper nº 120, on both sides and opposite to the hilum, the that for TME the number of days is higher for seedling formation (1.98 days) but it was the treatment that showed the best PE (84%) and IVE (1,3375) in A. pavonina L. seeds, due to ruptures in the integument, favoring the increase of water imbibition, being the main stage for the beginning of the germination process. The use of manual scarification with sandpaper on both sides of the integument and opposite to the hilum is recommend as pre-germinative treatment in A. pavonina L. seeds.

KEYWORD: reforestation, dormancy, dormancy overcomiing.