Ácido salicílico em sementes de soja submetidas ao estresse do envelhecimento acelerado

Abstract

Salicylic acid is a phenolic compound common to several physiological processes, among which it works as a modulator of biotic and abiotic stresses. In this sense, the objective of this work was to evaluate the physiological potential of soybean seeds soaked in different salicylic acid systems and submitted to accelerated aging stress. For this purpose, soybean seeds, cv. Monsoy 8644, were subjected to soaking for eight hours, in different services of salicylic acid (100, 150 and 200 mg.L-1 and the control, whose soaking was carried out in distilled water), between three sheets of germitest paper, with the amount equivalent to 2.5 times the mass of the dry substrate. After drying, they were placed under accelerated aging at 41 °C for periods of 0, 24 and 48 hours. Then, germination, electrical conductivity, field emergence, emergence speed index, mean emergence time and seedling mass were performed. The experimental design used was completely randomized, with four replications, with treatments arranged in a 4 x 3 factorial scheme (due to salicylic acid and three accelerated aging periods, respectively). The use of salicylic acid at a concentration of 100 mg.L-1 in the seeds reduces the aging stress accelerated aging for 48 hours/41ºC, while the needs of 150 and 200 mg.L-1 intensify the aging stress