Viability of Libidibia ferrea (Mart. ex Tul.) L.P. Queiroz var. ferrea) seeds by tetrazolium test

Rapid tests have been essential to evaluate the physiological potential of seeds and the tetrazolium test is one of those which have been used by seed companies. The objective of the study was to establish the procedure for the tetrazolium test in Libidibia ferrea (Mart. Ex Tul.) L.P. Queiroz var. ferrea seeds. For this, three tetrazolium solution concentrations (0.05, 0.075 and 0.1%) and three staining periods (1, 3 and 6 hours) at temperatures of 35 to 40 degrees C were tested. The seeds were also evaluated by the germination test, whose result was compared with viability by the tetrazolium test. The experimental design was completely randomized in a factorial design 3 x 3 + 1 (three concentrations x three periods + a control = germination test) for each temperature. Viable seeds in the tetrazolium test were compared by Tukey's test (p <= 0.05), while the comparison between the viable seeds with germination test was carried out by Dunnett's test (p <= 0.05). It is recommended that the tetrazolium test for L. ferrea is carried out at a concentration of 0.05% for three-hour staining under 35 degrees C or 40 degrees C.