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<p>Paclobutrazol (PBZ) is a plant growth regulator that regulates plant growth metabolism by inhibiting endogenous gibberellin synthesis, thereby effectively inhibiting vegetative growth. The aim of this study was to investigate the effects of PBZ treatment on postharvest fruit quality (ripening and decay) in ‘Tainong’ mango and its molecular mechanisms. Results indicated that PBZ treatment (1.5&#xa0;g/L) promoted changes in mango ripeness parameters including firmness, color, soluble solids content (SSC), titratable acidity (TA), color development and respiration rate, while inhibiting the decay lesion index. The Paclobutrazol treatment enhanced parameters related to membrane function and cell wall metabolism, namely peel electrical conductivity and pulp polygalacturonase enzyme activity, respectively. During mango ripening, PBZ treatment increased the accumulation of reactive oxygen species (ROS such as O₂⁻ and H₂O₂), but these ROS decreased after full ripeness. PBZ also increased malondialdehyde (MDA) accumulation while compromising membrane permeability and integrity. PBZ treatment significantly enhanced antioxidant enzyme activities (catalase (CAT), superoxide dismutase (SOD), peroxidase (POD)) to scavenge generated ROS. Transcriptome analysis confirmed consistent gene expression patterns with physiological changes. Furthermore, we focused on several relevant metabolic pathways, including MAPK signaling pathway-plant, plant hormone signaling transduction, plant-pathogen interaction, oxidative phosphorylation, and peroxisomes. These findings suggest that PBZ treatment could promote mango postharvest ripening and senescence while suppressing spoilage lesions, providing insights into the molecular regulatory mechanisms governing mango quality after harvest.</p>

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Integrated Physiological and Transcriptomic Analysis of the Effects of Paclobutrazol Treatment on Postharvest Ripening and Quality in Mango

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Xingdie Xu,
  • Mengzhuo Zhang,
  • Yan He,
  • Cuicui Wang,
  • Yu Wang,
  • Shiying Liu,
  • Yamei Chen,
  • Lanhuan Meng,
  • Xuequn Shi

摘要

Paclobutrazol (PBZ) is a plant growth regulator that regulates plant growth metabolism by inhibiting endogenous gibberellin synthesis, thereby effectively inhibiting vegetative growth. The aim of this study was to investigate the effects of PBZ treatment on postharvest fruit quality (ripening and decay) in ‘Tainong’ mango and its molecular mechanisms. Results indicated that PBZ treatment (1.5 g/L) promoted changes in mango ripeness parameters including firmness, color, soluble solids content (SSC), titratable acidity (TA), color development and respiration rate, while inhibiting the decay lesion index. The Paclobutrazol treatment enhanced parameters related to membrane function and cell wall metabolism, namely peel electrical conductivity and pulp polygalacturonase enzyme activity, respectively. During mango ripening, PBZ treatment increased the accumulation of reactive oxygen species (ROS such as O₂⁻ and H₂O₂), but these ROS decreased after full ripeness. PBZ also increased malondialdehyde (MDA) accumulation while compromising membrane permeability and integrity. PBZ treatment significantly enhanced antioxidant enzyme activities (catalase (CAT), superoxide dismutase (SOD), peroxidase (POD)) to scavenge generated ROS. Transcriptome analysis confirmed consistent gene expression patterns with physiological changes. Furthermore, we focused on several relevant metabolic pathways, including MAPK signaling pathway-plant, plant hormone signaling transduction, plant-pathogen interaction, oxidative phosphorylation, and peroxisomes. These findings suggest that PBZ treatment could promote mango postharvest ripening and senescence while suppressing spoilage lesions, providing insights into the molecular regulatory mechanisms governing mango quality after harvest.