Anadenanthera colubrina (Vell.) Brenan, a Leguminosae, belonging to the subfamily Mimosoideae, popularly known as angico, is a native species to Caatinga biome, known by its content of tannin in the bark, its utilization in construction, tanning industry and the recovery of degraded areas. Due to the importance of the species, the objective of this study was to evaluate the efficiency of different substrates on the seeds germination. The study was carried out in the greenhouse of the Laboratory of Biotechnology of Native Species Conservation at the Rio Grande do Norte Federal University. It was set up an experiment with four treatments including four replicates with 100 seeds per treatment and at the average temperature of 26ºC. Observations were made daily for 30 days. The treatments used were: T0-vermiculite, T1-humus, T2-sand and T3-clay. The following variables were analyzed: percentage of seedling emergence, seedling emergence speed index and average time of germination. The experimental design was completely randomized and the means were compared by Tukey's test at 5% of significance. It was found a significant difference for the percentage of seedling emergence for the vermiculite, humus and sand, with better performance in relation to clay; and for the emergence speed index and average time of germination, there was no statistically significant difference among the substrates. Concerning the results, we can observe that A. colubrina presents a good germinative potential in any of evaluated substrate with the exception of sand, clay. However, for the germination and emergence of angico, it is recommended the use of vermiculite, sand or humus.
Caatinga; Germination; Mimosoideae
