The MYB transcriptional factor BrMYB108 regulates Auxin-mediated delayed leaf senescence in postharvest Pak Choi

文献类型： 外文期刊

第一作者： Liu, Xuesong

作者： Liu, Xuesong;Chen, Xiaofei;Li, Pengxia;Xu, Xiaoyang;Li, Pengxia;Li, Pengxia;Li, Pengxia;Zhang, Yujun;Xu, Yinghao;Li, Pengxia;Huang, Wen

作者机构：

关键词： Pak choi; Auxin; BrMYB108; Postharvest; Senescence

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：6.8； 五年影响因子：7.5 ）

ISSN： 0925-5214

年卷期： 2025 年 219 卷

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收录情况： SCI

摘要： Auxin is the earliest discovered class of endogenous plant hormones, widely distributed in higher plants, and plays a key role in regulating plant growth and development. However, the molecular mechanism by which auxin affects postharvest leaf senescence in pak choi (Brassica rapa subsp. chinensis) remains unclear. In this study, we found that exogenous application of 2 mg L-1 of the auxin analog indoleacetic acid (IAA) could delay postharvest leaf senescence in pak choi. Importantly, we isolated an R2R3-MYB transcription factor (TF), BrMYB108, which was highly expressed in senescent leaves and whoes expression was suppressed by IAA treatment. Molecular evidence confirmed that BrMYB108 can bind to the promoter region of the chlorophyll metabolism gene BrSGR2 to activate its expression. Heterologous expression of BrMYB108 in Arabidopsis accelerated leaf senescence, while silencing BrMYB108 in pak choi using virus induced gene silencing (VIGS) delayed leaf senescence. In addition, we found that BrMYB108 is a direct target gene of the auxin response factor 17 (ARF17) homolog gene, BrARF17, in Arabidopsis. Our study reveals a model in which BrARF17 regulates postharvest leaf senescence in pak choi by targeting the expression of BrMYB108. These molecular insights into the auxin-mediated regulation of postharvest leaf senescence in pak choi have positive implications for manipulating BrMYB108 to improve the postharvest shelf life of vegetables.

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