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Regulatory effects of gibberellin and cytokinin on citrus peel cell wall metabolism

文献类型： 外文期刊

作者： Wang, Xun 1 ; Wang, Yuping 1 ; Cao, Defa 1 ; Gao, Panpan 1 ; Zhang, Mingfei 1 ; He, Jiaxian 1 ; Xiong, Bo 1 ; Liao, Ling 1 ; Sun, Guochao 1 ; He, Siya 1 ; Wang, QiangFeng 2 ; Xia, ZhongMei 2 ; Wang, Zhihui 1 ;

作者机构： 1.Sichuan Agr Univ, Coll Hort, Chengdu 611130, Peoples R China

2.Sichuan Acad Agr Sci, Inst Biotechnol & Nucl Technol, Chengdu 610061, Peoples R China

关键词： Citrus peels; Cell wall; Gibberellin; Cytokinin; DELLAs; B-ARRs

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.8； 五年影响因子：5.4 ）

ISSN： 1471-2229

年卷期： 2025 年 25 卷 1 期

页码：

收录情况： SCI

摘要： During citrus fruit development, exogenous gibberellin (GA) and 6-benzylaminopurine (6-BA, a synthetic cytokinin (CTK)) are both known to promote citrus peel thickness; however, the differences in their regulatory mechanisms on cell wall metabolism in citrus peels remain unclear. In this study, we found that GA treatment significantly increased cell wall polysaccharides in citrus peels, such as pectin and cellulose, whereas 6-BA treatment led to a notable accumulation of lignin. RNA-sequencing data revealed that several fruit ripening-related cell wall degradation genes, such as PME3, PL18, and EXPA1/8, exhibited decreased expression levels in both GA and 6-BA treatments. Additionally, a set of cell wall polysaccharide synthesis genes was upregulated in response to GA treatment but was largely downregulated in 6-BA-treated peels. Conversely, a group of lignin biosynthesis genes was upregulated in 6-BA-treated peels. GA treatment inhibited DELLA proteins (encoded by RGA and GAI) in the GA signaling pathway, whereas 6-BA treatment increased the expression of B-ARRs (ARR1 and ARR2) in the CTK signaling pathway. Furthermore, GA treatment elevated endogenous CTK levels, while 6-BA treatment also enhanced endogenous GA content, suggesting a reciprocal interaction between these two hormonal pathways.

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