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Exogenous Gibberellin Delays Postharvest Leaf Senescence in Pak Choi by Modulating Transcriptomic and Metabolomic Profiles

文献类型： 外文期刊

作者： Wang, Dan 1 ; Zhao, Xiuyun 2 ; Su, Tongbing 2 ; Wang, Weihong 2 ; Xin, Xiaoyun 2 ; Zhang, Bin 2 ; Zhang, Deshuang 2 ; Yu, Yangjun 2 ; Wang, Zhongjiang 6 ; Zhang, Fenglan 2 ; Zhou, Linyi 1 ; Li, Peirong 2 ; Yu, Shuancang 2 ;

作者机构： 1.Beijing Technol & Business Univ, Sch Food & Hlth, Beijing 100048, Peoples R China

2.Beijing Acad Agr & Forestry Sci BAAFS, Beijing Vegetable Res Ctr BVRC, Beijing 100097, Peoples R China

3.Beijing Acad Agr & Forestry Sci BAAFS, Beijing Vegetable Res Ctr BVRC, State Key Lab Vegetable Biobreeding, Beijing 100097, Peoples R China

4.Minist Agr, Key Lab Biol & Genet Improvement Hort Crops North, Beijing 100097, Peoples R China

5.Beijing Key Lab Vegetable Germplasm Improvement, Beijing 100097, Peoples R China

6.Northeast Agr Univ, Coll Food Sci, Harbin 150030, Peoples R China

关键词： gibberellin; chlorophyll degradation; leaf senescence; storage; pak choi

期刊名称：FOODS （ 影响因子：5.1； 五年影响因子：5.6 ）

ISSN：

年卷期： 2025 年 14 卷 6 期

页码：

收录情况： SCI

摘要： Postharvest leaf senescence is a pivotal determinant influencing the quality and shelf life of leafy vegetables, exemplified by pak choi (Brassica rapa L. subsp. chinensis). While the regulatory role of gibberellin (GA) in modulating leaf senescence has been documented across diverse plant species, the underlying physiological and molecular mechanisms remain insufficiently characterized. This study, through a combination of transcriptomic and metabolomic analyses, investigated the effect of exogenous GA on postharvest leaf senescence in pak choi. GA treatment alleviated etiolation, maintained chlorophyll levels, reduced conductivity and malondialdehyde content, and delayed the onset of senescence symptoms in postharvest pak choi. Transcriptome profiling indicated that GA suppressed the expression of the senescence-associated genes BraSRGs and BraSAGs. In addition, GA influenced chlorophyll degradation and preserved chlorophyll content by modulating the expression of genes implicated in chlorophyll metabolism, including BraPPH, BraSGR1, BraNYCI, and BraPAO. GA treatment impacted lipid levels and regulated the degradation of membrane phospholipids. Furthermore, exogenous GA treatment disrupted the efficacy of the jasmonic acid signal pathway, primarily through the transcriptional downregulation of key regulatory genes, including BraJAZ10 and BraJAR1. These results provide insights into the role of GA in delaying postharvest leaf senescence and highlight potential targets for improving postharvest management in leafy vegetables.

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