Effects of exogenous melatonin and abscisic acid on osmotic adjustment substances of 'Summer Black' grape under drought stress

Abstract

In this study, seedlings of grape 'Summer Black' were used as the experimental materials to investigate the effects of melatonin (MT) and abscisic acid (ABA) on osmotic adjustment substances under drought stress, by root irrigating 100μmol/L MT and spraying 50μmol/L ABA solutions before or during the drought treatment. The results showed that the content of malondialdehyde and relative conductivity were significantly lower in the MT group than that in the drought control group, and the contents of soluble protein and hydrogen peroxide were significantly higher in the ABA treatment than that in the drought control group. However, regardless of the application of ABA or MT, the relative water content in leaves did not change much. The results suggested that the concentration of exogenous substances and the sampling time were unsuitable to improve drought tolerant at 18d, which provided a theoretical basis for MT and ABA appliance in grape planting.