Department of Life Sciences, Yuncheng University, Yuncheng, Shanxi Province 044000, PR China; Atopy & Health Research Institute, Jeonju University, Jeonju 55069, Republic of Korea; Department of Science, Technology & Industry, Yuncheng University, Yuncheng, Shanxi Province 044000, PR China.
Research Institute of Pomology, Shanxi Academy of Agricultural Sciences, Taigu, Shanxi Province 030815, PR China.
Food Chem. 2019 Dec 15;301:125311. doi: 10.1016/j.foodchem.2019.125311. Epub 2019 Aug 1.
We assessed the effects of postharvest exogenous melatonin (50,100 and 150 µmol L) on the senescence and quality of sweet cherries during storage at 0 ± 0.5 °C. Melatonin treatment decreased decay incidence, respiration rate, and weight loss. It delayed the degradation of firmness, lightness, saturation, hue angle, titratable acidity, and total soluble solids content, thus maintaining better fruit quality. Melatonin treatment inhibited increases in O, HO malondialdehyde content, and relative membrane permeability, while maintaining higher endogenous melatonin levels and increasing superoxide dismutase and catalase activity. Additionally, melatonin treatment enhanced the activity of antioxidant enzymes, increased the levels of ascorbic acid, and reduced glutathione levels, which are related to the ascorbate-glutathione cycle, as well as increasing the AsA:DHA and GSH:GSSG ratios. Delayed senescence in sweet cherries after exogenous melatonin treatment may be associated with high endogenous melatonin levels and increased antioxidant activity and content.
我们评估了采后外源褪黑素（50、100 和 150µmol•L）对 0±0.5°C 贮藏期间甜樱桃衰老和品质的影响。褪黑素处理可降低腐烂发生率、呼吸速率和失重。它延缓了硬度、明度、饱和度、色调角、可滴定酸度和总可溶性固形物含量的降解，从而保持更好的果实品质。褪黑素处理抑制 O、HO 丙二醛含量和相对膜通透性的增加，同时保持较高的内源性褪黑素水平，并增加超氧化物歧化酶和过氧化氢酶活性。此外，褪黑素处理增强了抗氧化酶的活性，增加了抗坏血酸和还原型谷胱甘肽的水平，这与抗坏血酸-谷胱甘肽循环有关，并增加了 AsA:DHA 和 GSH:GSSG 的比值。外源褪黑素处理后甜樱桃衰老的延迟可能与高内源性褪黑素水平和增强的抗氧化活性和含量有关。
