Germinação de sementes de jatobá embebidas em diferentes concentrações de ácido giberélico

Abstract

Jatobá seeds have dormancy caused by the resistance and impermeability of the tegument. This impediment prevents the gas exchange and the flow of water from the seed with the external environment, which prevents the germination and emergence of the seeds in a uniform way. One of the main functions of gibberellic acid is to stimulate seed germination, to control growth by elongation, acting as a phytoregulator, having an effect on breaking dormancy in many seeds. In this context, the objective was to evaluate different concentrations of gibberellic acid in overcoming dormancy of jatobá using the scarification method, aiming to standardize germination and emergence of seeds. The experiment was conducted at the Federal Institute of Piauí, Campus Uruçuí. The treatments used were the following doses and dilutions of gibberellic acid: 100mg in 0.5L of distilled water; 150mg in 0.5L of distilled water; 200mg in 0.5L of distilled water and 0.5L of distilled water (control). The design used was completely randomized, with 4 replications. Germination percentage, germination speed index, mean germination time, plant length, stem diameter, shoot dry mass, root dry mass and Dickson quality index were evaluated. The imbibition of scarified jatobá seeds in gibberellic acid does not interfere with the germination and development of the seedlings