Effect of low-temperature conditioning combined with methyl jasmonate treatment on the chilling resistance of eggplant (Solanum melongena L.) fruit
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Chilling injury (CI) can injure harvested eggplants and lead to a reduction in postharvest quality. The present study examined the effect of low-temperature conditioning (LTC) combined with a methyl jasmonate (MeJA) treatment on CI by analyzing the visual appearance and physiology of eggplants stored at 4 °C. Results indicated that treatment of eggplants with LTC + MeJA effectively maintained the visual quality of eggplants, inhibited a decline in chlorophyll and total phenolics, delayed the accumulation of malondialdehyde (MDA), decreased polyphenol oxidase (PPO) gene expression and enzyme activity, and enhanced the activity of the antioxidant enzymes, catalase (CAT) and peroxidase (POD), as well as the expression of their corresponding genes. Collectively, the data indicate that LTC combined with MeJA effectively improves the CI tolerance of postharvest eggplant fruit stored at 4 °C, by enhancing the activity and relative gene expression of antioxidant enzymes.
KeywordsChilling injury Phenolics Antioxidase Gene expression
The financial support provided by the National Key Research and Development Program of China (2016YFD0400901), the China Agriculture Research System Project (CARS-23), Special innovation ability construction fund of Beijing Academy of Agricultural and Forestry Sciences (20180404 and 20180705), the Young Investigator Fund of Beijing Academy of Agricultural and Forestry Sciences (201709). The authors are also thankful to the critical reading of the manuscript by Dr. Michael Wisniewski, USDA-ARS-Appalachian Fruit Research Station.
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