Germinação de sementes e crescimento inicial de plântulas de Phytolacca dioica L. (Phytolaccaceae) em função da submersão em água

Abstract

This study aimed to obtain information about the tolerance of seeds Phytolacca dioica submersion in water for 0, 2, 4, 8, 16 and 32 days. After each period of submersion tests were performed germination and analysis of the initial growth of seedlings. For germination, seeds were sown in germination boxes and kept in BOD. For each test were analyzed the percentage of germination, speed of germination index and mean germination time. In seedlings were analyzed the growth of roots and shoots, stem diameter, fresh and dry weight of roots and shoots. The overflow time affected the dissolved oxygen content and seed germination but did not affect seed germination. The characteristics of the seeds of Phytolacca dioica observed tolerant species suggest that periods of anoxia for 32 days under these conditions and maintain seedling metabolism ensuring maintenance of the environment in which it occurs. The results indicate that the seeds of Phytolacca dioica are tolerant to submergence in water, which must be associated with the natural occurrence of this species in riparian environments.