Effects of Melatonin Treatments on the Fruit Quality and Related Physiological Indexes of Postharvest Pears

doi:10.7668/hbnxb.20194243

Abstract

Abstract:

In order to explore the potential of melatonin to maintain the fruit quality of postharvest pear fruits,providing references for the research and development of storage and fresh preservation technologies of postharvest fruits,we carried out this research.In which Xinli No.7 pear fruits harvested at mature stage were selected as materials,and they were soaked in 0(control),0.02,0.20 and 1.00 mmol/L melatonin solutions for 2,4,8,12 and 24 h,respectively.Then we sampled and determined the effects of melatonin treatments on the internal qualities of pear,the activities of cell wall lysis related enzymes,the activities of antioxidant related enzymes,and the content of endogenous melatonin and salicylic acid in fruit peel and sarcocarp.The results showed that the hardness of the pear fruits soaked with 0.02,0.20 and 1.00 mmol/L melatonin for 8 h was 38.51,42.79,and 40.95 N/cm²,respectively,and the ethylene release rate decreased by 66%,70% and 71% respectively compared with the control.The soluble solid content(SSC)of pear fruits soaked with 0.2 mmol/L melatonin for 8 h was 94 g/L,which was significantly higher than that of the control(80.2 g/L)and was 1.17 times of the control.And the titrable acid(TAC)of pears of the same treatment was 1.013 g/L,which was also significantly higher than that of the control(0.90 g/L)and was 1.13 times of the control.In addition,treating pear fruits with exogenous melatonin could significantly increase the enzyme activities of superoxide dismutase(SOD),peroxidase(POD)and catalase(CAT),reduce the enzyme activities of polygalacturonase(PG),pectin methylesterase(PME)and Lipoxygenase(LOX),and could increase the endogenous melatonin content in fruit peel and the endogenous salicylic acid content in fruit(peel and sarcocarp).To sum up,soaking pear fruits with 0.2 mmol/L melatonin solution for 8 h had the maximum potential to maintain the fruit quality of postharvest pears,which could keep better fruit quality,keep lower cell wall lysis related enzyme activities and higher antioxidant enzyme activities,and could make the pear fruits having higher level of endogenous melatonin and salicylic acid content.

Key words: Pear, Fruit quality, Enzyme activity, Melatonin, Preservation potential

ZHAO Pengfei, LUO Shichao, XU Peixuan, SUN Xiaofeng, XU Weimin, MA Hui, XU Jianfeng, ZHANG Haixia. Effects of Melatonin Treatments on the Fruit Quality and Related Physiological Indexes of Postharvest Pears[J]. Acta Agriculturae Boreali-Sinica, 2023, 38(S1): 211-218. doi: 10.7668/hbnxb.20194243.

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Figures/Tables 6

Fig.1 Effects of different melatonin treatments on pear fruit quality Different lowercase letters indicate significant differences at the 5% level among different concentrations of melatonin at the same time.The same as Fig.2—6.

Fig.2 Effects of different melatonin treatments on enzyme activities of PG,PME and LOX of pear fruits

Fig.3 Effects of different melatonin treatments on enzyme activities of CAT,POD,SOD and APX of pear fruits

Fig.4 Effects of different melatonin treatments on ethylene release rate of pear fruits

Fig.5 Effects of different melatonin treatments on endogenous melatonin content of pear fruits

Fig.6 Effects of different melatonin treatments on endogenous salicylic acid content of pear fruits

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