Overcoming dormancy in seeds of Sapindus saponaria L. (Sapindaceae)

Abstract

The Sapindus saponaria L. it is a species that possesses propagation just for seeds and her germination tax is relatively moderate the drop. Therefore, it was aimed at to evaluate different treatments pre-germinating in the overcoming dormancy of the numbness of seeds of this species. The work was driven in atmosphere protected in the Federal University of Campina Grande, in Pombal, Paraíba. The seeds were desinfested with hipoclorito to 2% for five minutes, washed in running water and submitted to the following treatments pre-germinating: intact (witnesses - T1) seeds; manual escarification with aid of sandpaper of water nº 100 on the opposite side to the micropyle (T2); chemical escarificação through the immersion in sulfuric acid to 98% Shovel, during 10, 30 and 60 minutes (T3, T4 and T5, respectively) and physical escarification through the immersion in hot water to 80 ºC for five minutes, following by thermal shock in cold water to 5 ºC for more five minutes (T6). A completely randomized design with four replicates. The seeds were submitted to the emergency tests in sand, index of emergency speed, plant height, root length, mass dries of the aerial part and of root and percentage of hard seeds. The job of the manual scarification with sandpaper of water nº 100 on the opposite side to the micropyle of the seeds is the treatment recommended by being simpler and of larger efficiency, seeking the preservation of the physiologic quality of the seeds and a better vegetative development.