Abstract
Jujube fruit was treated with melatonin to evaluate the changes of quality parameters, anti-oxidative ability and cell wall-degrading enzymes activities during room temperature storage. The results showed that melatonin treatment significantly inhibited respiratory rate and ethylene release of jujubes. Melatonin treatment also delayed the changes of color and sustained titratable acidity. Moreover, melatonin treatment increased the activities of glutathione reductase, ascorbate peroxidase and monodehydroascorbate reductase, and enhanced ascorbic acid, dehydroascorbic acid and reduced glutathione contents in jujubes. In addition, application of melatonin delayed fruit softening by inhibiting the activities of pectin methylesterase, polygalacturonase, cellulose and β-glucosidase and production of water soluble pectin and maintaining water insoluble pectin content. All these results indicate that application of melatonin after harvest could delay fruit softening, improve anti-oxidative capacity, and thus delay fruit senescence of jujubes.
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