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The fluoride exporter (CsFEX) regulates fluoride uptake/accumulation in Camellia sinensis under different pH

文献类型： 外文期刊

作者： Wu, Zichen 1 ; Xing, Anqi 1 ; Chu, Ruiwen 2 ; Xu, Xiaohan 1 ; Sun, Yi 1 ; Zhu, Jiangyuan 1 ; Yang, Yiyang 2 ; Yin, Juan 3 ; Wang, Yuhua 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Hort, Nanjing 210095, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Leisure Agr, Nanjing 210014, Peoples R China

3.Jiangsu Maoshan Tea Resorts Co Ltd, Changzhou 213200, Peoples R China

关键词： Camellia sinensis; Fluoride exporter(FEX); pH; Fluoride accumulation

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2024 年 278 卷

页码：

收录情况： SCI

摘要： Fluoride (F) can be absorbed from the environment and hyperaccumulate in leaves of Camellia sinensis without exhibiting any toxic symptoms. Fluoride exporter in C. sinensis (CsFEX) could transport F to extracellular environment to alleviate F accumulation and F toxicity, but its functional mechanism remains unclear. Here, combining with pH condition of C. sinensis growth, the characteristics of CsFEX and mechanism of F detoxification were further explored. The results showed that F accumulation was influenced by various pH, and pH 4.5 and 6.5 had a greater impact on the F accumulation of C. sinensis. Through Non-invasive Micro -test Technology (NMT) detection, it was found that F uptake/accumulation of C. sinensis and Arabidopsis thaliana might be affected by pH through changing the transmembrane electrochemical proton gradient of roots. Furthermore, diverse expression patterns of CsFEX were induced by F treatment under different pH, which was basically upregulated in response to high F accumulation, indicating that CsFEX was likely to participate in the process of F accumulation in C. sinensis and this process might be regulated by pH. Additionally, CsFEX functioned in the mitigation of F sensitivity and accumulation strengthened by lower pH in Escherichia coli and A. thaliana. Moreover, the changes of H+ flux and potential gradient caused by F were relieved as well in transgenic lines, also suggesting that CsFEX might play an important role in the process of F accumulation. Above all, F uptake/ accumulation were alleviated in E. coli and A. thaliana by CsFEX through exporting F-, especially at lower pH, implying that CsFEX might regulate F accumulation in C. sinensis.

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