Physiological Potential of Seeds of Handroanthus spongiosus (Rizzini) S. Grose (Bignoniaceae) Determined by the Tetrazolium Test

Tetrazolium test (TZT) can quickly evaluate in detail the viability and vigor of seeds. This study aimed to determine optimal conditions for conducting TZT on seeds Handroanthus spongiosus. For this purpose, from three lots were pre-soaked water 16 h, followed by extraction tegument immersion tetrazolium salt solutions at different concentrations (0.01–0.1%), increasing periods (1–4 h) 30 °C dark. The experimental design was completely randomized with a 4 × factorial scheme 25 per repetition. We applied generalized linear models Tukey pairwise comparisons means 5% probability. viability/vigor results compared data obtained germination using subsample same lots. time (1 h did not cause clear coloration difference. subjected all treatment 3 presented average greater than 60%, no difference percentage. 0.01% solution most efficient assessing spongiosus