Environmental factors affect the germination process, like the presence of seed coat and the quality of light; these informations are still scarce for many native species from Brazil, especially for Senna cana, which there are no adequate standards and methodologies to be used in germination tests. The aim of this research was to recommend adequate pre-germinative treatment(s) to overcome seed dormancy, and determine the degree of influence of different light regimes in seed germination of S. cana. Two experiments were carried out: T1-evaluation of different methods of dormancy overcoming (intact seeds (control), T2-imbibition of the intact seeds for 24 hours (in distilled water), T3-scarified seeds with sandpaper n° 100 in the hilum opposite region, T4-scarified seeds with sandpaper n° 100 in the region the hilo opposite region and imbibition in water (in distilled water) for 24 hours; T5-imbibition in water at 80°C); 2-Influence of light quality on seed germination and vigor (white light, red light, far red light and absence of light). The evaluated parameters were: first JEAI, 32(5): 1-9, 2019; Article no.JEAI.47671 2 germination count, percentage of germination, IVG (Germination speed index), MGT (Mean germination time). Treatments were compared by Tukey at 5% probability. The best method for overcoming seed dormancy was mechanical scarification with sandpaper nº 100. The germination of the seeds of S. cana can be classified as indifferent to the luminosity, despite germinative response be greater under white and red light. Original Research Article

The objective of this study was to evaluate the dynamics of natural regeneration in an urban forest fragment in Recife -PE. Ten plots of 5 m x 5 m were installed, the individuals with height (H) ≥ 1 m and the circumference at breast height (CBH) ≤ 15 cm were measured in 2010 and 2017. The floristic composition, diversity, phytosociological parameters and natural regeneration by height and total classes were evaluated. The individuals were distributed in height classes, where: C1 = H ≥ 1.0 up to 2.0 m; C2 = H> 2.1 to 3.0 m; C3 = H> 3.0 m and CAP <15 cm. The families with the highest number of individuals in both years were: Moraceae, Burseraceae, Euphorbiaceae and Fabaceae. Together, these families accounted for 74.57% of the total number of individuals in 2010 and 73.40% in 2017. The predominance of individuals in the first class was observed, followed by the second and third. The species with the highest Total Natural Regeneration (TNR) were: Artocarpus heterophyllus, Helicostylis tomentosa, Protium giganteum, Protium heptaphyllum, Brosimum guianense and Mabea occidentalis, which together corresponded to a TNR of 60.09% in 2010 and Original Research Article

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This study aimed to define a methodology that, when combined with temperature, can overcome the dormancy and also to determine the adequate substrate and light conditions for germination of Colubrina glandulosa Perkins, contributing to seed analysis and restoration projects. In the experiment of dormancy and temperature, seeds were immersed in sulfuric acid for 30, 60, 90, 120 and 150 minutes and set to germinate at temperatures of 20-30 °C, 25 °C and 30 °C. The used substrates were sand, vermiculite, Tropstrato ® substrate, coconut powder, blotting paper and paper towel. As for the light supplied, the seeds were subjected to four luminosity regimes: white light, far-red light, red light and light absence. Temperatures of 20-30 °C and 30 °C achieved better results, with exposure in sulfuric acid for 120 and 150 minutes. The substrates sand and vermiculite were the most suitable. The species germinated in all light regimes treatments used.