Studies Of Postharvest Physiology And Storage Technology On Plum Fruit

The experiment were performed’Black Amber’ and ’Nai’plum as sample, which were studied to compare the effects of postharvest physiology and storage technology of plum fruit under different cold storage conditions. We devised four postharvest treatments, that is, storage at 1℃,intermittent warming form 1℃ to room temperature every 14 days and coated with either CaCl2 or combined with chitosan at 1℃.In the 42 days trial period, we detected the color, flavor and decaying conditions of fruits. Finally, the fruits were decayed badly at 1℃. In contrast, the CaCl2 coating combined with chitosan at 1℃ was the best treatment than any other treatments. It can benefit for the maintaining of postharvest quality.Under such postharvest treatments, we detected the hardness of the plum fruit. The result shows that the hardness was falling during the whole storage. Compared with the reference group, the fruit which coated with either CaCl2 or combined with chitosan at 1℃ can slow down the decline of hardness significantly.In the whole period, we detected the content of SSC and TA. The result showed that the content of SSC presented a trend of first rise and then drop. And the content of TA presented an overall downward trend. Compared with the reference group, the CaCl2 coating combined with chitosan at 1℃ was the best treatment in the late storage.The result showed that the CaCl2 coating combined with chitosan at 1℃ can delay the decrease the content of CEL and HC, inhibit the increase of WSP and CSP, at the same time, delay the decrease of the content of ASP.the CaCl2 coating and the CaCl2 coating combined with chitosan can keep the enzyme activity of SOD, decrease the enzyme activity of PG, POD and the content of MDA.In summary, the CaCl2 coating combined with chitosan at 1℃ was the best treatment than any other treatment.