Ácido salicílico e tempo de pré embebição na superação da dormência e morfofisiologia de umbuzeiro.

Abstract

Umbuzeiro belongs to Anacardiaceae family, having as survival characteristic, the abscission of leaves in drought, roots specialized in water storage, fast stomatal closure in water stress and fibrous seed integument that causes dormancy. Umbuzeiro stands out as an important generation source of job and income for small farmers in some semiarid regions, through the extraction of fruits. The present study evaluated the dormancy overcoming of umbuzeiro seeds submitted to interaction between pre-soaking time factors and salicylic acid concentrations. The experiment was in a randomized block design, with 5x5 factorial, forming 25 treatments, with 100 installments divided in 4 blocks, being 12 replications and 300 experimental units. Time of 32 hours provided an increase to EiUA, with a superiority of 16.54%, that when compared in the shortest time. With increasing concentration as from 40g/L, there was a reduction in internal concentration of CO2 (Ci) and stomatal conductance (gs). There was also reduction sweating (E), but from the concentration of 80g/L. The longest time (32 hours) and concentration (160g/L) it was responsible for the highest percentage (PE) and emergence speed (LVI) and increased root dry mass phyto (FSR) and total (FST).