A necessidade de se averiguar ocorrência de dormência em sementes de acácia amarela é importante para produção de mudas sadias e com desenvolvimento desejável, principalmente para recomposição florestal. O experimento foi realizado no IFES, com sementes extraídas manualmente de vagens recém-colhidas de plantas localizadas no instituto, as mesmas foram imersas em água destilada, solução de giberelina 0,3 % (v/v) e solução de cloreto de potássio 5 % (v/v), por 30 minutos, água quente (90 ºC) e água com gelo (entre 0 ºC e 2 ºC) por 30 minutos. Foi avaliado a porcentagem de germinação; índice de velocidade de germinação; tempo médio de germinação; número de folhas; altura da parte aérea; comprimento da raiz; massa fresca e massa seca das plântulas. The treatments with gibberellin and potassium chloride were superior in all the variables related to germination and green mass production, evidencing the importance of the pre germinating treatment of the seed. The treatment with ice, although not improving the germination, presented superior results to the control in the characteristics related to root growth and height of the seedling. Treatment with gibberellin or KCl, and ice treatment may be recommended for acacia seeds.
The need to investigate the occurrence of seed dormancy in yellow acacia is important for the production of healthy seedlings and desirable development, especially for forest restoration. The experiment was conducted at IFES, with extracted seeds from freshly harvested plants located in the institute, immersed in distilled water, 0.3 % solution of gibberellic acid and potassium chloride 5%, for 30 minutes pods hot water (90 ° C) and ice water (between 0 ° C and 2 ° C) for 30 minutes. We evaluated the percentage of germination; index of germination speed; mean germination time; number of leaves; shoot height; root length; green mass and seedling dry weight of seedlings. Treatments with gibberellin and potassium chloride were higher than the control, indicating the importance of hormone use in seed treatment. Treatment with ice, while not improving germination were higher than in the control characteristics related to early seedling development results. Treatment with gibberellin or KCl, and the ice treatment may be recommended for seed acacia.
