Métodos para análise de sementes de Pithecellobium diversifolium Benth. e Bowdichia virgilioides Kunth.

Abstract

The forest plantations alternatives are sufficiently used to try themselves to reduce the level of ambient degradation. Thus, the forest seeds of good quality if constitute in essential inputs for the formation of these plantations. This work had as objective to define procedures for validation of methods for analysis of seeds of Pithecellobium diversifolium Benth. (espinheiro-preto, carcarazeiro) and Bowdichia virgilioides Kunth (sucupira), with deriving seeds of biomes Caatinga and Rainforest, respectively. The experiments had been carried through in the Laboratory of Analysis of Forest Seeds (LASF) of the Department of Forest Science (DCFL) of the UFRPE. Gerbox was used transparent and opaque, with cover and dimensions of 11 x 11 x 3 cm, being used the substrates washed sand, rolled paper (MB), vermiculite and germ test paper as paper towel (PT), being this last rolled up and placed inside of transparent and opaque plastic bags. How much to the temperatures, the influence on the germination of the constant of 25 °C and 30 °C and alternated temperatures of 20-30 °C was tested. For the luminosity we analyzed the influence of continuous light and dark. The design was completely randomized 3 x 4 x 2 (3 temperatures, 4 and substrate 2 light environments). All the treatments had been tested with four repetitions contend 25 seeds each. The following parameters had been evaluated: percentage of germination, index of germination speed (IVG), green mass and dry mass of seedlings. Germination was evaluated daily by direct counting on two occasions, from the emission of the radicle and the formation of the seedling, the latter according to the established by RAS. For the species B. virgilioides the vermiculite substrate interacting with the constant 25 and 30 °C and paper towel at 30 °C provided the best germination results for normal seedlings by root length and shoot, for fresh and dry mass. In turn, the species showed P. diversifolium best value for normal seedling, length of shoot and root in the paper towel substrate in ambient light, in the alternating temperature of 20-30 °C and the constant of 30°C. Although the seeds to have in such a way germinated in the presence how much in the light absence, the luminosity favored more the speed, the uniformity of the germination and the formation of seedlings.