采后乙烯利、1-MCP处理对苹果梨蜡质组分的影响

Effect of Postharvest Ethephon and 1-MCP Treatments on the Chemical Composition of Cuticular Wax in Pingguoli Pear Fruit

通过气相色谱-质谱联用技术对不同剂量的乙烯利浸泡和1-甲基环丙烯(1-methylcyclopropene,1-MCP)熏蒸处理贮藏5个月的苹果梨表皮蜡质化学组分进行分析比较。结果表明,采后乙烯利、1-MCP处理对苹果梨蜡质化学组分的种类、含量均有一定的影响,且存在剂量效应,其中乙烯利处理明显增加了蜡质化学组分的种类,降低了脂肪酸、烷烃的相对含量,提高了萜类物质的相对含量;而1-MCP熏蒸后果皮蜡质组分的种类略有增加,且提高了烷烃和醛类物质的相对含量,同时乙烯利和1-MCP处理对蜡质主要组分烷烃、脂肪酸和醛类的碳链长度也有一定的影响。

The chemical composition of the cuticular wax of postharvest Pingguoli pear which were either dipped into different concentrations of ethephon or fumigated with 1-methylcyclopropene（1-MCP） and then stored for 150 days was analyzed by gas chromatography-mass spectrometry（GC-MS）. Results showed that the postharvest ethylene and 1-MCP treatments had an effect on the types and contents of compounds in the cuticular wax of Pinggguoli pear in a concentrationdependent manner. Ethephon treatment could significantly increase the diversity of compounds in cuticular wax, reduce the contents of fatty acids and alkanes, and enhance the content of terpenoids, while the diversity of compounds in cuticular wax was slightly increased in pear fruit treated with 1-MCP with a simultaneous increase in the contents of alkanes and aldehydes. Meanwhile carbon chain lengths of the main composition alkanes, fatty acids and aldehydes were affected by either postharvest treatment.