1-MCP二次处理对番木瓜采后生理生化及贮藏品质的影响

【目的】探讨1-MCP（1-甲基环丙烯）二次处理对番木瓜采后生理生化及贮藏品质的影响。【方法】以日升番木瓜果实为材料，研究在室温条件下，1mg／L 1-MCP一次处理和二次处理后对果实生理生化指标及贮藏寿命的影响。【结果】1-MCP处理推迟了番木瓜果实呼吸高峰的到来，抑制了叶绿素的分解，提高了蛋白质含量和SOD、POD活性，降低了O2^·-冶量和细胞膜透陛，但抑制果实TA和VC含量的上升，其中1-MCP二次处理的效果更突出。【结论】1-MCP二次处理更能延缓番木瓜果实的衰老。

Effect of 1-methylcyclopropene(1-MCP)on post-harvest storage quality of papaya

Objective]The objective of the present study was to investigate the effect of 1-methylcyelopropene （1-MCP） treatment on post-harvest physio-biochemical changes and storage quality of papaya. Method ]Post-harvest changes in physio-biochemical parameters （membrane permeability, respiration rate, titrable acidity and chlorophyll, protein and vitamin C content）, activities of antioxidative enzymes （superoxide dismutase： SOD; peroxidase： POD） and free oxygen radicals （superoxide anion： O2^·-） were investigated during 13 d storage of Risheng papaya treated two times with 1-MCP （ 1 mg/L） at room temperature. Result]The treatment of 1-MCP was found to delay the peak time of respiration rate, inhibit decomposition of chlorophyll, decrease the superoxide anion （O2^·-） content and membrane permeability, and increase protein content and antioxidative enzyme activities. However, it also inhibited the increase in titrable acidity and VC content. The effects of second time application of 1-MCP treatment were more pronounced. Conclusion]Two times application of 1-MCP （1 mg/L） was found to enhance the post-harvest quality of papaya fruits during its long term storage.