RESUMO -O trabalho teve como objetivo ampliar o conhecimento sobre a germinação de Mimosa flocculosa Burkart e eficiência dos tratamentos de superação de dormência com foco na embebição, mobilização de reservas, anatomia tegumentar e germinação das sementes. Foi realizada a curva de embebição e a partir desta, foi estipulado o perfil trifásico para os três tratamentos: controle, água a 80 °C por 10 minutos e ácido sulfúrico 98% por três minutos. Foram analisados durante a embebição os açúcares, proteínas e anatomia tegumentar das sementes, junto com a germinação, verificando: porcentagem, frequência e sincronização da germinação. Nossos resultados demonstraram que os dois métodos utilizados de superação de dormência nas sementes de M. flocculosa são indicados, pois estimularam uma curva de embebição mais uniforme, maior degradação de açúcares e proteínas, o tegumento destes tratamentos apresentou fissuras e desestruturações auxiliando a entrada de água, elevando a germinação e com tendência à sincronização.Palavras-chave: espécie nativa, germinação, tegumento duro ABSTRACT -Imbibition curve, anatomy and mobilization of reserves in seeds of Mimosa flocculosa Burkart submitted to overcoming of dormancy. This study aimed to expand knowledge about Mimosa flocculosa Burkart seed germination and efficiency of break dormancy treatments, focusing on hydration, reserves mobilization, integument anatomy and seed germination. We conducted a hydration curve, and from that, we stipulated a three-phase profile for each treatment: control, water at 80 ºC for 10 min and sulfuric acid 98% for 3 min. Sugars and proteins, integumentary anatomy and germination parameters (germination percentage, frequency and synchrony of germination) were analyzed during hydration. Our results showed that the overcoming dormancy methods used in M. floculosa seeds are indicated, since they improved germination, uniformed hydration, presented integument fissures and destabilizations increasing water uptake and germination synchrony.

The Atlantic Forest is one of the most threatened Brazilian biomes by anthropic action. Thus, the interest inrecovering degraded areas through the use of native tree species has increased, causing a high demand in the use of vigorous seeds. This research aimed at evaluating the suitabilityof the electrical conductivity and accelerated aging tests to evaluate the vigor of C. myrianthum diaspores. For the adequacy of the electrical conductivity test, a completely randomized experimental design (CRD) was used in a 2 x 3 x9 (number of diaspores x volume of water x imbibition time)at a constant temperature of 25 °C. The procedure for the accelerated aging test was conducted at 40 ºC for 0 (no aging), 24, 48 and 72 hours. ACRDwas also used for the accelerated aging test, totaling 4 treatments. The results were submitted to analysis of variance (ANOVA) and the means were compared by the Tukey test at 5% probability. It is concluded that the electrical conductivity test for C. myrianthum diaspores can be conducted with 25 diaspores soaked with 50 mL of deionized water for 96 hours, thus replacing the germination test with the advantage of being carried out in a shorter period of time. Moreover,the 24 and 48 hour accelerated aging period is adequate to discriminate the vigor of C. myrianthum diaspores, with GSI and MGT being the most sensitive variables.