2019 ASHS Annual Conference

The effects of abscisic acid (ABA) 8’-hydroxylase inhibitor (Abz-E3M) on drought tolerance and rooting in grape cuttings under dehydration condition were examined. Water potential, proline concentration, antioxidant activity, and endogenous ABA and ABA metabolites (phaseic acid and dihydrophaseic acid) in leaves and percentage of rooted cuttings and endogenous indole-3-acetic acid (IAA) in basal point of cuttings were analyzed. Endogenous ABA in Abz-E3M group was higher than those in control group at 4 days after treatment and ABA metabolites significantly decreased in Abz-E3M group compared to the control group. Water potential in Abz-E3M group was higher than that in the control group among the experiment. Proline concentrations and antioxidant activity in Abz-E3M group were lower than those in the control group under dehydration stress. The percentage of rooted cuttings in Abz-E3M group was higher than that in the control group significantly at 8 days after treatment and endogenous IAA in Abz-E3M group was higher than that in the control group at 4 days after treatment. Theses results suggest that Abz-E3M enhanced drought tolerance and percentage of rooted cuttings in grapes under dehydration condition by regulating phytohormone.