Melatonin delays postharvest broccoli yellowing by stabilizing reactive oxygen species homeostasis via the ascorbate–glutathione cycle

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ID: 332274
2026
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Abstract
Abstract Broccoli is characterized by vigorous postharvest metabolism, making the flower heads prone to fading green and turning yellow, as well as the loss of nutrients, which seriously compromises its commercial quality. Therefore, it is essential to develop safe and effective preservation methods. The present study found that 100 µmol/L melatonin (MT) effectively mitigated oxidative stress by inhibiting the accumulation of reactive oxygen species (ROS), thereby preventing the occurrence of postharvest yellowing of broccoli. Further research showed that the inhibitory effect of MT on ROS accumulation primarily stemed from the improvement of the contents of antioxidant compounds such as ascorbate (AsA) and glutathione (GSH) and the activities of related antioxidant enzymes. Correlation analysis revealed that the yellowing index is highly significantly negatively correlated with the activities of ascorbate peroxidase (APX), glutathione reductase (GR), and dehydroascorbate reductase (DHAR), underscoring the crucial role of the AsA–GSH cycle in MT-mediated antioxidant defense. Analysis of gene expression levels further revealed that MT predominantly regulates the activities of related enzymes by increasing the expression levels of BoCAT, BoAPX2, BoAPX3, and BoGR, thus achieving ROS balance and contributing to the preservation effect.
Reference Key
openalex_W7221705025 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Yuxuan Zhu, Mei Song, Manli Luo, Xin Zhou, Qian Zhou, Shujuan Ji
Journal Food Quality and Safety
Year 2026
DOI
10.1093/fqsafe/fyag067
URL
https://doi.org/10.1093/fqsafe/fyag067
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