| 'Oishiwase'plums which are extremely precocious ripening species, show a typical climacteric ripening behaviour. Because of high-temperature of the harvest season and strong respiratory metabolism, the fruit rapidly ripening at room temperature with shelf life only 5 to 7 days, seriously effecting the commercial value of plums. Therefore, extending the shelf life of'Oishiwase'plums at room temperature is urgently solved. In this study,'Oishiwase'plums of green mature were used as experimental materials to investigate the effects of 1-MCP intermittent treatment and chitosan coating on fruit ripening and softening. The objective of our study was to show the effects of 1-MCP intermittent treatment and chitosan coating on quality and antioxidative enzymes of 'Oishiwase' plums, and to learn how the mechanisms might be involved in 1-MCP intermittent treatment. The results obtained as follows.The study used green mature'Oishiwase'plums as material to investigate the effects of 1-MCP intermittent treatment on quality properties, color, antioxidant enzymes and softening related enzymes during plum fruit ripening and senescence after postharvest by 1-MCP intermittent treatment. The results showed that at room temperature storage conditions,1μl/L 1-MCP intermittent treatment could delay the decreased of fruit firmness, maintain high contents of soluble sugar, titratable acid and soluble pectin, inhibited the increased content of MDA, to maintain good fruit quality.1μl/L 1-MCP intermittent treatment could maintain high level of CAT activity, inhibited the activity of pectinase and cellulase increases, to delay fruit softening.1-MCP intermittent treatment significantly inhibited the degradation of chlorophyll and anthocyanin synthesis, delayed the development of fruit color. Increasing the treatment times, the effects were much more obviously. During the post-storage the plum fruit of 1μl/L 1-MCP intermittently treatment for 3 times could not turn to normal red with poor taste. Considering taste and color, the effect of 1-MCP treatment twice best, could effectively delay ripening and softening of plum fruit based on the appearance quality and eating quality to extend the shelf-life of 6-7 days.The study used green mature'Oishiwase' plums as material to investigate the effects of chitosan coating contained gibberellin on physiological and biochemical changing during storage at home temperature. The results showed that the chitosan coating combined gibberellin could effectively delay the decline of fruit firmness, maintain high contents of soluble sugar, titratable acid and soluble pectin, inhibit the increased content of MDA and anthocyanin, the degradated of chlorophyll. The chitosan coating combined with gibberellin could effectively improve the CAT activity, inhibit the increased of POD activity, little effect on SOD activity. Chitosan coating contained gibberellin could extend the shelf-life of 3-4 days effectively. |
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