Caracterização morfo-fisiológica da germinação de sementes de Senna siamea (Lam.) em diferentes substratos e temperaturas

Abstract

Determining adequate procedures for conducting the germination test in forest species is important to enable the commercialization of seed lots, especially for those that are not included in the Normative Instructions. Therefore, the objective was to determine the ideal temperature and substrate conditions for the Senna siamea seed germination test, as well as to characterize the morphophysiology of the seedling establishment during the germination process and the period for the evaluation of the seedlings, the in order to carry out at the end of the experiment the evaluation of the efficiency of the methodology in different batches of Senna siamea seeds. The experimental design used was entirely random, in which for the preevaluation, the arrangement was factorial 2 x 2 (temperatures x substrates) with 12 repetitions of 50 seeds for each treatment, the data obtained were subjected to analysis of variance and the means compared by the Tukey test at the level of 5% probability. For the evaluation between the different lots, the data obtained were subjected to analysis of variance and the means compared by the Scott-Knott test (1974) at the level of 5% probability. It recorded the percentage and speed of germination, first count, seedling length, accumulated germination, seedling morphology during germination. Senna siamea seeds have higher germinative potential in paper roll substrate at temperatures of 25 and 30 ° C. The first germination count and final seedling germination must be done at 10 and 21 days after sowing, respectively. The species has germination of epigeal type seeds and its seedlings are phanerocotyledonous. The use of substrate conditions on a paper roll and at a temperature of 25 ° C proved to be efficient when tested in different batches of Senna siamea seeds.