Influência da luminosidade na germinação de Tabebuia impetiginosa Mart ex DC

Abstract

The objective of this work was to evaluate the germination of Tabebuia impetiginosa seeds under four light conditions (red, extreme red, absence of light and control) and two treatments (with and without tegument). For each treatment, 4 replicates were used, with 25 seeds arranged in a gerbox box in solution with agar (6g/L). The seeds were then kept in an incubator at constant temperature of 30 ° C with photoperiod of 10/14 hours of light. The analyzed variables were germination percentage and germination speed index (IVG). The analysis of variance (Test F) and test of comparison of means (Tukey) both at 5% probability, were performed in the SISVAR program. The seeds of ipê-purple that had their integument removed, can be classified as neutral photoblasts, germinating both in the presence and absence of light. The highest percentages of germination were found in treatments with white light (99%) followed by treatments without light (98%) and extreme red (98%). Seeds that did not have their tegument removed had the lowest germination results (33% for white light and 9% for red light treatment). The highest value of IVG was found in seeds without tegument, in the conditions of extreme red light (23.88 seeds/ day), absence of light (23.22 seeds/ day) and red (22.95 seeds/ day). For the seeds that did not have the tegument removed, the results were in the treatments with white light (1.91 seeds/day) and red light (0.46 seeds/ day).