Germinação de sementes, vigor e divergência entre matrizes de jurema preta (Mimosa tenuiflora (Willd.) Poiret – Fabaceae

Abstract

The jurema preta (Mimosa tenuiflora (Willd.) Poiret) is an native specie of Caatinga with high ecological importance as much economical. This specie show an shrub aspect and come been hardly explored for wood production without manager, in ceramics production in bakeries in surrounds and in agricultural families for food baking. The aim of this study was evaluated the seeds germination and vigor, and the phenotipical divergence in initial stages of jurema preta. The seeds were characterized by 1000 seeds mass and humidity degree. The seedlings vigor was evaluated by length of aerial part, root and aerial part/root relation. The weight of 1000 seed of matrixes 7 (7,94g) and 9 (8,26g) presented higher means, wile the matrix 3 presented the worse mean (5,72g), the seeds of matrixes of jurema preta showed humidity degree minor that 9%. For electrical conductivity all matrixes presented variation in time, demonstrating that in intact seeds there are imbibitions and solute lixiviation. The majority of matrixes presented germination near 80%, but the matrix 5 presented 62,67% of germination. The weight of roots and the aerial part/root relation of seedling of the matrix differed statistically. The variables that contributed more for matrixes divergence, was aerial part (38,59%), germination (26,19), the root weigh (21,11%) and the electrical conductivity (13,17%). The humidity degree was that variable than present little contribution for the genetic divergence (0,91). The Mahalanobis distance was 0,83, possibiting 2 groups separation. We conclude that the germination behavior makes possible the first evaluation can be make in the in the six days. The electrical conductivity cam be evaluated in 72 hours at at start. The aerial part weight is the variable more adjusted for evaluated differences between jurema preta matrixes, and the divergence of trees matrixes of the same population is small.