Promotion of immature seed germination in Jacaranda mimosifolia

In vitro germination of immature seeds of Jacaranda mimosifolia treated with gibberellic acid (GA₃) was studied. Immature seeds were collected monthly after crossings and sown on Murashige and Skoog (1962) medium with 3.0% sucrose and 0.6% agar after soaked 24 hours with 0, 10, 100, and 500 mg·L^-1 GA₃ solutions. Though germination was observed in the immature seeds harvested 2 months after crossing (2 MAC), the rate was quite low. When immature seeds of 3 MAC treated with 100 or 500 mg·L^-1 GA₃ solution were cultured, >60% germination were obtained within 2 weeks after culturing. These results indicate that immature seeds of 3 MAC treated with adequate GA₃ solutions, seedlings can be obtained precociously and the period from crossing to the seedling stage was shorter than for mature seeds.