Germinação e superação de dormência de diásporos de Tectona grandis L.f.

Tectona grandis L.f. (teak) is an exotic forest species of economic and social importance for Brazil. The teak seeds are inserted in fruits that have hard endocarp and mesocarp of high resistance which produces a slow and irregular germination of the seeds and constitutes a limitation for the production of teak seedlings. The methods that have been used to overcome dormancy produce slow and irregular germination. The objective of this work was to evaluate methods of overcoming dormancy in teak diaspores, in order to verify the viability of the methods in the uniformization of teak seed germination. The experiment was installed in a completely randomized design, with five methods of breaking dormancy, on two different substrates, one only of washed sand and the other of sand + organic soil, where they form 10 treatments, 2 repetitions and 50 diaspores per repetition. The control treatment (T6) in sand + organic soil was the procedure that presented, in the diaspores, a germination percentage of 65% and a germination speed index of 1.40, values higher than those found in the pre-germinative treatments that were used.