MÉTODOS DE SUPERAÇÃO DE DORMÊNCIA EM SEMENTES DE JITIRANA

Abstract

An experiment was carried out in the Botanical Laboratory of the Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró-RN, aiming to evaluate the efficiency of dormancy breaking methods on seed germination of scarlet starglory in hypochloride sodium. A completely randomized desing was used with five treatments and four replications. The treatments consisted of T1 - Seed immersion in hypochloride sodium for 15 minutes, T2 - Seed immersion in hypochloride sodium for 25 minutes, T3 - Seed immersion in hypochloride sodium for 35 minutes, T4 - Seed immersion in hypochloride sodium for 45 minutes, T5 - No mechanical scarification and no seed immersion in hypochloride sodium. The seeds in all treatments were submitted to the immersion in boiling water for one minute for posterior process of steeping in cold water for 24 hours. All seeds were mechanically scarifield for 30 minutes before the immersion in hypochloride sodium. Evaluations for plant height, root length, shoot fresh and dry mass, seed germination percentage and germination speed index (GSI) were made. It was observed that the increase in immersion time in hypochloride sodium increased the percentage in the first seed couting, seed germination percentage and germination speed index, reaching maximum values of 94.07%, 98.49% and 17.48, respectively.