Superação de dormência em sementes de trevo branco, trevo vermelho e trevo vesiculoso

Abstract

The rapid and uniform germination of the seeds is of great interest, as it allows a reduction in seeding densities and consequently production costs. Most clover species have seeds with dormancy, caused by the presence of a waterproof layer on the surface. These seeds are called "hard seeds" and the difficulty to absorb water is what prevents their germination. In this context, the objective of the present study was to evaluate different methods of breaking dormancy in seeds of red-clover (Trifolium pratense), white-clover (Trifolium repens), and vesicle-clover (Trifolium vesiculosum). The experiment was conducted in Gerbox boxes with temperature (25 ° C) and controlled luminosity. The treatments of dormancy breaking were: (T1) treatment in the presence of light, considered the control; (T2) treatment in the dark, where the gerbox boxes were wrapped with brown paper; (T3) use of gibberellic acid and (T4) mechanical scarification with sandpaper No. 80, for 30 seconds. After fifteen days of germination, the results showed that the red-clover species reached 90% germination percentage. The methods used to break dormancy were important for the germination of seeds of the genus Trifolium, particularly the mechanical scarification treatments with sandpaper (Treatment 4) and the use of gibberellic acid (Treatment 3) for vesicle-cover and white-clover and the use of dark (Treatment 2) for the red-clover.