The Co-regulation of Ethylene Biosynthesis and Ascorbate–Glutathione Cycle by Methy Jasmonate Contributes to Aroma Formation of Tomato Fruit during Postharvest Ripening

作者：Dedong Min, Zilong Li, Wen Ai, Jiaozhuo Li, Jingxiang Zhou, Xinhua Zhang, Dan Mu, Fujun Li, Xiaoan Li, Yanyin Guo · 发表于：Journal of Agricultural and Food Chemistry · 年份：2020 · DOI：10.1021/acs.jafc.0c04519 · 被引用次数：55 · 研究领域：Postharvest Quality and Shelf Life Management、Plant Physiology and Cultivation Studies、Nanocomposite Films for Food Packaging

Currently, many fruits are always harvested at the early ripening stage to reduce postharvest losses followed by 1-methylcyclopropene (1-MCP) or ethephon treatment. However, harvesting at the early ripening stage adversely affects fruit quality, especially for the aroma. Methyl jasmonate (MeJA) treatment could induce the biosynthesis of bioactive compounds and maintain postharvest fruit quality. In the present work, the contributions of MeJA to tomato fruit quality during postharvest ripening were studied. The results showed that MeJA treatment significantly promoted the accumulation of volatile organic components (VOCs) by inducing the activities of enzymes related to lipoxygenase pathway and ethylene biosynthesis, whereas 1-MCP treatment largely inhibited the accumulation of VOCs by inhibiting activities of those enzymes. Although the application of ethephon also induced activities of the above enzymes in comparison with control, no significant differences were observed between the VOCs contents of the control and ethephon-treated fruit. Further study revealed that the ethephon treatment resulted in the enhancement of electrical conductivity and malondialdehyde content. Conversely, MeJA treatment inhibited the superoxide anion radical and hydrogen peroxide by regulating the ascorbate-glutathione cycle and further inhibited the enhancement of electrical conductivity and malondialdehyde content, which might be one of the most important reasons why the VOCs contents in fruit t...