Effects of Metschnikowia pulcherrima and 24-Epibrassinolide on Postharvest Preservation of Grapes

Abstract:

[Objective] This study aims to investigate the effects of different treatments on the postharvest preservation of grapes.[Method] The impacts of 0.4 mg/L 24-epibrassinolide (EBR), 1×10⁹ CFU/mL Metschnikowia pulcherrima, and their combination (YBR) on postharvest storage of ‘Shine Muscat’ grapes were evaluated.[Result] Compared with the control (CK) group, EBR, Metschnikowia pulcherrima, and YBR treatments effectively reduced the water loss rate, maintained the firmness, and delayed the declines in protopectin and stem chlorophyll content of grape. In the later storage stage, YBR treatment delayed the decrease in flavonoid mass fraction, which was 12.95% higher than that of CK group. At the same time, YBR treatment reduced the mass molar concentrations of superoxide anion and malondialdehyde (MDA) by 25.15% and 33.84%, respectively. In addition, YBR treatment increased the peroxidase (POD) activity and inhibited the polyphenol oxidase (PPO) activity to alleviate the oxidative damage of grape during storage.[Conclusion] This study confirms the application potential of Metschnikowia pulcherrima combined with EBR.