褪黑素处理对百香果采后贮藏品质的影响

为了研究褪黑素处理对百香果采后贮藏期间生理特性以及品质的影响，以‘福建百香果3号’为材料，将百香果浸泡在浓度为（0、0.05、0.10、0.20 mmol/L）的褪黑素溶液中1 h后置于保鲜盒中，在常温（25±1 ℃）下进行贮藏，分析其硬度、色泽、可溶性固形物、可溶性糖等指标的变化。结果表明:CK组的百香果在贮藏第12 d时超过77%的果实已经腐烂，褪黑素处理组的质量损失率在8.22%~12.81%之间，腐烂率为22.22%~38.89%，均显著低于CK组（P<0.05），可溶性固形物、可滴定酸、可溶性糖含量都显著高于CK组（P<0.05），保证了果实的品质；贮藏16 d时，CK组果实已经全部腐烂，0.20 mmol/L褪黑素处理的百香果硬度为9.95 kg/cm2，显著高于其他两组处理组（P<0.05）；质量损失率为15.52%，显著低于其他两组处理组（P<0.05），其他品质指标和另两组处理组之间无显著差异。综合来看，0.05、0.10、0.20 mmol/L褪黑素处理都可以延长百香果的贮藏时间，使得其果实品质维持在较高水平，而0.20 mmol/L褪黑素处理贮藏保鲜效果最佳。

Effect of Melatonin Treatment on Storage Quality of Passion Fruit after Harvest

The effects of melatonin treatment on physiological characteristics and quality of passion fruits during post harharvest storage were valuated. The passion fruits were dipped in 0, 0.05, 0.10, 0.20 mmol/L melatonin (MT) solution for 1 hour, then put in crisper and stored at room temperature (25±1 ℃), the parameters of firmness, color, soluble solid, soluble sugar and other indexes were analyzed. The results showed that more than 77% of the passion fruits in the CK group had rotted on the 12th day of storage, the mass loss rate and decay rate of melatonin treatment group were 8.22%~12.81% and 22.22%~38.89%, which were significantly lower than those of CK group (P<0.05), the melatonin treatment groups kept a good quality and the contents of soluble solids, titratable acid and soluble sugar were significantly higher than CK group (P<0.05). On the 16th day, all the fruits in CK group had rotted, the firmness of passion fruits treated with 0.20 mmol/L melatonin was 9.95 kg/cm2, which was significantly higher than that in the other two melatonin groups (P<0.05), and the weight loss rate was only 15.52%, which was significantly lower than that in the other two treatment groups (P<0.05), while other quality parameters had no significant differences between the other two treatment groups. In conclusion, 0.05, 0.10 and 0.20 mmol/L melatonin treatments could prolong the storage time of passion fruits and maintain the quality at a high level, while 0.20 mmol/L melatonin treatment had the best effect.