GERMINA??O E REINDU??O DA TOLER?NCIA à DESSECA??O EM SEMENTES DE Senna multijuga (RICH.) IRWIN ET BARN

摘要

The aims of this study were to verify the effects of different tests in the overcoming dormancy, excellent germination terms, as light and temperature, and the possibility of re-induction of desiccation tolerance in Senna multijuga seeds. We evaluated two tests for overcoming dormancy: immersion in water with an initial temperature of 100oC (hot water) and immersion in water at a constant temperature at 100oC for 20 seconds (boiling water), both treatments followed by rest out of the heating for 24 hours. For the germination test, we evaluated 25oC, 30oC (constant) and 20-30oC (alternate), in the presence and absence of light. For the re-induction of desiccation tolerance, we selected seeds germinated with 1, 2, 3 and 4mm of radicle length. We submitted the germinated seeds to the follow treatments: no incubation, incubation in polyethylene? glycolphotoblastic required, but in light conditions the germination was higher. We observed the resumption of the radicle growth in germinated seeds of up to 3mm length.