Seed longevity of Colubrina glandulosa Perkins stored
Colubrina glandulosa Perkins is a species of ecological and socioeconomic importance, but in danger of extinction. The present study aimed to evaluate different storage conditions to check the physiological quality of the colubrina seeds. The seeds were stored in a paper bag and glass bottle, in a laboratory environment and in a dry chamber, during for 0, 3, 6, 9, 12, and 15 months. For each storage period and condition, the following variables were evaluated: water content, germination, speed, mean time and germination synchrony, total length, and dry mass of seedlings. The experimental design was completely randomized, in a 2 × 6 factorial arrangement (2 packs and 6 storage periods), with 4 replicates of 25 seeds. The water content of the seeds ranged from 8.0% to 17.8%, depending on the packaging and environmental conditions of the storage site, being physiologically classified as orthodox. Under the laboratory conditions, seed physiological potential decreased from 6 months onward in the paper packaging. Seeds conditioned in a porous or impermeable packaging with a water content of 8.0%, in the dry chamber condition, remained viable when stored for 15 months.