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<p>Tannic acid (TA), a naturally occurring polyphenol, exhibits broad-spectrum antimicrobial and antioxidant activities. This study elucidates the mechanisms by which TA controls <i>Alternaria alternata</i> in Korla fragrant pears. In vitro, TA at 10 mg mL<sup>−</sup><sup>1</sup> directly inhibited fungal growth by inducing hyphal deformation. In vivo, TA treatment significantly attenuated blackhead disease development. The underlying protective mechanism involved two coordinated pathways: first, TA enhanced the activity and gene expression of key antioxidant enzymes [Ascorbate peroxidase (APX), Glutathione reductase (GR), Catalase (CAT), Superoxide dismutase (SOD)], sustaining the ascorbic acid-glutathione (AsA-GSH) cycle to scavenge excessive reactive oxygen species (ROS). Second, TA suppressed the activity and gene expression of lipid-degrading enzymes [Lipoxygenase (LOX), lipase, Phospholipase C (PLC), Phospholipase D (PLD), Phospholipase A2 (PLA2)] while elevating fatty acid desaturation enzymes (FADS) activity. This regulation preserved membrane lipids [phosphatidylcholine (PC), phosphatidylinositol (PI), and unsaturated fatty acids (USFAs)], reduced harmful metabolites [phosphatidic acid (PA), free fatty acids (FFAs), and malondialdehyde (MDA)], and thereby maintained membrane integrity. Our findings demonstrate that TA functions as a multi-target postharvest treatment, primarily through the dual regulation of redox homeostasis and membrane lipid metabolism to reinforce fruit resistance.</p><p></p>

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Tannic acid enhances postharvest resistance of Korla fragrant pears to Alternaria alternata by modulating membrane lipid and reactive oxygen species metabolism

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月3日

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  • Yisong Tang,
  • Weida Zhang,
  • Wanting Yang,
  • Tongrui Sun,
  • Jiankang Cao,
  • Shaobo Cheng,
  • Guogang Chen

摘要

Tannic acid (TA), a naturally occurring polyphenol, exhibits broad-spectrum antimicrobial and antioxidant activities. This study elucidates the mechanisms by which TA controls Alternaria alternata in Korla fragrant pears. In vitro, TA at 10 mg mL−1 directly inhibited fungal growth by inducing hyphal deformation. In vivo, TA treatment significantly attenuated blackhead disease development. The underlying protective mechanism involved two coordinated pathways: first, TA enhanced the activity and gene expression of key antioxidant enzymes [Ascorbate peroxidase (APX), Glutathione reductase (GR), Catalase (CAT), Superoxide dismutase (SOD)], sustaining the ascorbic acid-glutathione (AsA-GSH) cycle to scavenge excessive reactive oxygen species (ROS). Second, TA suppressed the activity and gene expression of lipid-degrading enzymes [Lipoxygenase (LOX), lipase, Phospholipase C (PLC), Phospholipase D (PLD), Phospholipase A2 (PLA2)] while elevating fatty acid desaturation enzymes (FADS) activity. This regulation preserved membrane lipids [phosphatidylcholine (PC), phosphatidylinositol (PI), and unsaturated fatty acids (USFAs)], reduced harmful metabolites [phosphatidic acid (PA), free fatty acids (FFAs), and malondialdehyde (MDA)], and thereby maintained membrane integrity. Our findings demonstrate that TA functions as a multi-target postharvest treatment, primarily through the dual regulation of redox homeostasis and membrane lipid metabolism to reinforce fruit resistance.