Effects of Exogenous GABA Treatment on Quality and Antioxidant Activity of Postharvest"Cuihongli"Plum(Prunus salicina Lindl.cv."Cuihongli")
[Objective]The study is aimed to explore the effect of exogenous γ-aminobutyric acid(GABA)on fruit quality and antioxidant capacity of postharvest 'Cuihongli'plum(Prunus salicina Lindl.cv.'Cuihongli')during storage.[Method]The 'Cuihongli'fruit were immersed in solutions containing 0,0.1,0.5,1.0 mmol/L GABA for 20 minutes.Following the treatments,the fruits were allowed to air dry and subsequently stored at a temperature of(28±1)℃for 6 days.The fruit quality parameters,such as hardness,weight loss rate,soluble sugars,and the activities of antioxidant enzymes,including cata-lase(CAT),superoxide dismutase(SOD)and peroxidase(POD),as well as malondialdehyde(MDA)content,were determined every day during storage(0-6 d).[Result]The results showed that exog-enous GABA treatment significantly reduced the rate of fruit weight loss,maintaining high level of soluble sugars and hardness.Additionally,GABA treatment significantly increased the activities of CAT,SOD and POD,while delaying the increase of MDA content.The storage effectiveness was observed in the order when GABA treatment at the concentrations of 1.0 mmol/L＞0.5 mmol/L＞0.1 mmol/L＞0 mmol/L.[Conclusion]GABA maintains postharvest storage quality of 'Cuihongli'fruit by preserving fruit hardness,soluble sugar content,and enhancing antioxidant activity.Among the treatments,1.0 mmol/L GABA has shown the most effective preservation effects in maintaining the quality of 'Cuihongli'fruit,indicating its promising application potential.
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