Desempenho fisiológico de sementes e plântulas de espécies florestais submetidas à salinidade por KCl.

Abstract

The present study aims evaluate the physiological performance of seeds and seedlings of ipê roxo (Handroanthus impetiginosus (Mar. ex DC.) Mattos), paineira (Ceiba speciosa (A.St. Hil ex Brako) Ravenna), paricá (Schizolobium parahyba Var. amazonicum (Huber ex Ducke) Barneby) and pau de balsa (Ochroma pyramidale (Cav. ex Lam.) Urb.) submitted to salinity per potassium chloride (KC1). The seeds were submitted to treatment with KC1 diluted in different concentrations (25, 50, 75 and 100 mM), having as witness distilled water (0 mM). The delineation was entirely randomized represented by five treatments and four replicates of 25 seeds per treatment. The percentage of germination, first count and speed index of germination were evaluated, as well as the shoot length and main root and fresh and dry mass of seedlings. Data was submitted to analysis of normality and when they presented as normal, analysis of variance, averages and regression comparison were made. There was no effect of KCl in the analyzed variables of ipe roxo. The seeds and seedlings of paineira obtained germination, speed of germination, length of main root, fresh and dry mass reduced as increase of salt concentration of KC1. The seeds and seedlings of paricá obtained germination, speed of germination, length of main root, fresh and dry mass reduced as increase of salt concentration of KC1. The seed of pau de balsa obtained an increase on germination, speed of germination, length of main root and fresh mass until salt concentration of 75 mM.