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<p>Lonicera caerulea is a nutrient-rich berry with high economic value, but its rapid postharvest quality decline limits marketability and shelf life. Pre-harvest melatonin treatment mitigates post-harvest quality decline in <i>Lonicera caerulea</i> by modulating ROS and phenylpropanoid metabolism. Spraying <i>Lonicera caerulea</i> with 150 µmol·L<sup>− 1</sup> melatonin 24&#xa0;h pre-harvest preserved quality over 98 d: higher TSS and anthocyanins, lower respiration and ethylene, and maintained firmness. Transcriptome sequencing identified numerous differentially expressed genes (DEGs) related to phenylpropanoid and flavonoid metabolism in MT_150-treated fruits, with 9 structural genes (<i>Lcl</i>PAL (4), <i>Lcl</i>CHS (2) and <i>Lcl</i>DFR (3)) and 1 transcription factor (<i>Lcl</i>bHLH6) significantly down-regulated. The up-regulated genes were mainly involved in the biosynthesis of phenylpropanoid and flavonoid, enhancing fruit quality and antioxidant capacity. MT_150 boosted phenylpropanoid enzymes (PAL, C4H, 4CL, β-1,3-glucanase) to raise phenolics and flavonoids, while enhancing ROS-scavenging enzymes (SOD, POD, CAT) and lowering ·OH, O<sub>2</sub>·<sup>−</sup> and H<sub>2</sub>O<sub>2</sub> accumulation. In summary, pre-harvest melatonin treatment effectively preserves the quality of <i>Lonicera caerulea</i> L. during storage by modulating ROS and phenylpropanoid metabolism.</p>

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Preharvest melatonin modulates ROS-phenylpropanoid metabolism in Lonicera caerulea

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Xiangjun Chen,
  • Shutong Wu,
  • Di Xv,
  • Di Wu,
  • Peng Zhang,
  • Jiangkuo Li

摘要

Lonicera caerulea is a nutrient-rich berry with high economic value, but its rapid postharvest quality decline limits marketability and shelf life. Pre-harvest melatonin treatment mitigates post-harvest quality decline in Lonicera caerulea by modulating ROS and phenylpropanoid metabolism. Spraying Lonicera caerulea with 150 µmol·L− 1 melatonin 24 h pre-harvest preserved quality over 98 d: higher TSS and anthocyanins, lower respiration and ethylene, and maintained firmness. Transcriptome sequencing identified numerous differentially expressed genes (DEGs) related to phenylpropanoid and flavonoid metabolism in MT_150-treated fruits, with 9 structural genes (LclPAL (4), LclCHS (2) and LclDFR (3)) and 1 transcription factor (LclbHLH6) significantly down-regulated. The up-regulated genes were mainly involved in the biosynthesis of phenylpropanoid and flavonoid, enhancing fruit quality and antioxidant capacity. MT_150 boosted phenylpropanoid enzymes (PAL, C4H, 4CL, β-1,3-glucanase) to raise phenolics and flavonoids, while enhancing ROS-scavenging enzymes (SOD, POD, CAT) and lowering ·OH, O2·− and H2O2 accumulation. In summary, pre-harvest melatonin treatment effectively preserves the quality of Lonicera caerulea L. during storage by modulating ROS and phenylpropanoid metabolism.