Studies On Post-harvest Physiology And Chemicals Screening For Storage Of Winter-jujube

In this paper, changes of the substance and activities of en2ymes about post-harvest physiology of winter-jujube were studied and several chemicals were screened for winter-jujube storage based on the analyses of the post-harvest physiology and the senescence mechanism. The results showed that, during storage, distinct respiration peaks were not found; the lost of water was easy and quick at the normal temperature. The softening of the harvested winter-jujube was coincided with the decrease of polygalacturonase activity and carboxymethylcellulose. Amylase activity increased at the beginning of storage and decreased at last, pectinmethylesterases activity increased, ethanol content increased, Vc content was negatively correlated with ethanol. Ethanol content and amylase activity have most important impact on the firmness of winter-jujube was found after statistic analyses. Several chemicals were screened for winter-jujube storage. In all treatments, -l癈+500 uL L--1 prochloraz+holed plastic film can effectively inhibit the softening of winter-jujube. With this treatment the ratio of sellable fruit touches to 89.4 percent , it is distinct higher than another treatment or none treatment. The fruits tend to decay at later period of storage though they were treated by chemicals and low temperature and other technologies.