Influência do tamanho das sementes na germinação e vigor em sementes de Tabebuia impetiginosa (mart. Ex dc.) Standl

Abstract

The ipe-purple, Tabebuia impetiginosa (Mart. Ex DC.) Standl, is a native forest species, belonging to the family Bignoniaceae Tabebuia genre. The seeds of this species present orthodox behavior regarding storage, and are equipped with membranous wing at both ends, facilitating their dispersion anemocoric. The aim of the study was to analyze the effect of seed size on germination. The study was conducted at the Seed Laboratory of the Federal University of Mato Grosso (UFMT) Campus of Sinop, in the period from April to May 2015. The method used was to perform the linear measurement of the major axis (without the membranous wing) seeds later this seed lot was divided into three size classes, Small (9,72-10,46 mm), Medium (10,47-11,19 mm) and Grande (11,20-11,93 mm). The test was performed with a 12 hour photoperiod and 30 ° C incubation temperature. For each treatment, four replicates were performed twenty-five seeds each. The results were submitted to ANOVA and Tukey 5% test, where we compared the average germination percentage and germination speed index. The size of seeds influences the speed germination index (IVG) and vigor, and, large and medium sized seeds had such small higher values for these parameters, but the seed size did not affect the germination process.