Effect of preharvest spraying of CaCl2 on postharvest fruit softening quality of prunes
[Objective]To study the effects of pre-harvest CaCl2 spray treatment on post-harvest fruit softening and cell wall metabolism of prunes.[Methods]Using Franciscan prunes from Jiashi County,Kash-gar Prefecture,Xinjiang,as the test material.2％CaCl2 was used to spray the fruits during the expansion,col-our change and harvesting periods,and the post-harvested prune fruits were placed in cold storage at a tem-perature of(4±1)℃ and a humidity of 90％-95％for 42 d.[Results]The results showed that preharvest CaCl2 treatment inhibited the rise in respiratory intensity and cell membrane perm ability of prune fruit,de-layed the onset of respiratory peaks,delayed the decline in raw pectin and cellulose content,and inhibited the rise in soluble pectin,polygalacturonase,pectin methyl esterase,cellulase and β-glucosidase activities.CaCl2 put off the post-harvest softening process of prune fruit by delaying the degradation of cell wall compo-nents,thus effectively maintaining the postharvest hardness of prune fruit.By 28 day of storage,the hardness of CaCl2 treated prune fruit increased by 11.23％,the cellulose content increased by 8.51％and the polyga-lacturonase,pectin methyl esterase,cellulase and β-glucosidase activities decreased by 4.31％,32.60％,24.60％and 64.38％,respectively.[Conclusion]Therefore,CaCl2 preharvest treatment is a preservation method to improve the post-harvest quality of prune fruit.
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