Improving berry quality and antioxidant ability in ‘Ruidu Hongyu’ grapevine through preharvest exogenous 2,4-epibrassinolide (EBR), jasmonic acid (JA) and their signaling inhibitors by regulating endogenous phytohormones

exogenous 2,4-epibrassinolide (EBR) and JA were sprayed on grape berry before veraison stage, new variety grapevine ‘Ruidu Hongyu’ (red bud mutant of ‘Ruidu Xiangyu’) was used as experimental material, the contributions of exogenous EBR and JA on the berry sugar accumulation, anthocyanin biosynthesis, fatty acids enrichment and antioxidants formation were discussed, the correlation among trace phytohormone BR and grape berry quality/antioxidant ability was forecasted.