外源褪黑素对常温货架期不同品种草莓果实贮藏品质的影响

Effects of Exogenous Melatonin Treatment on Storage Quality of Strawberry Fruits with Shelf Life at Normal Temperature

为探究褪黑素(MT)对采后常温货架期不同品种草莓果实贮藏品质的影响,以红颜和章姬2个草莓品种果实为试材,设置300,500,700μmol·L^(-1)的褪黑素浓度处理草莓,以蒸馏水处理为对照,测定常温货架期草莓果实形态和生理生化指标。结果表明:与对照相比,褪黑素处理降低了红颜和章姬草莓果实失水率、果肉腐烂率和腐烂指数,延缓了果实硬度、可溶性固形物、可滴定酸、Vc含量的下降,抑制了丙二醛(MDA)含量的上升,增加了总酚、类黄酮和花青素的含量。总之,在常温贮藏条件下,褪黑素处理可显著提高草莓的耐贮性和贮藏品质。此外,当褪黑素浓度为500和700μmol·L^(-1)时,能够有效延缓红颜草莓和章姬草莓果实的衰败变质,保鲜效果较佳。

To explore the effects of melatonin(MT)treatment on the storage quality of different strawberry varieties during normal temperature shelf life after harvest.Two varieties of strawberry,Benihoppe and Akihime,were treated with melatonin concentrations of 300,500,700μmol·L^(-1),and treated with dis-tilled water as the control.The morphology,physiological and biochemical indexes of strawberry fruits during shelf life at normal temperature were determined.The results showed that compared with the control,melatonin treatment reduced the water loss rate,pulp decay rate and decay index of strawberry fruits of Benihoppe and Akihime,delayed the decline of fruit hardness,soluble solid,titrable acid and Vc contents,inhibited the rise of malondialdehyde(MDA)content,and increased the contents of total phenols,flavonoids and anthocyanins.In conclusion,melatonin treatment can significantly improve the storage resistance and storage quality of strawberries under normal temperature storage.In addition,when the melatonin concentration was 500μmol·L^(-1) and 700μmol·L^(-1),the treatment of Benihoppe strawberry and Akihime strawberry could effectively delay the deterioration of fruit,and the preservation effect was better.