CsLHY positively regulates cold tolerance by activating CsSWEET17 in tea plants

文献类型： 外文期刊

第一作者： Wu, Yedie

作者： Wu, Yedie;Di, Taimei;Wu, Zhijing;Peng, Jing;Wang, Jie;Zhang, Kexin;He, Mingming;Li, Nana;Hao, Xinyuan;Wang, Xinchao;Wang, Lu;Wu, Zhijing;Fang, Wanping;Wang, Lu

作者机构：

关键词： CsLHY; CsSWEET17; Cold response; Circadian rhythm; Transcriptional activation

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：6.5； 五年影响因子：6.4 ）

ISSN： 0981-9428

年卷期： 2024 年 207 卷

页码：

收录情况： SCI

摘要： Low temperature is one of the most important environmental factors limiting tea plants' geographic distribution and severely affects spring tea's yield and quality. Circadian components contribute to plant responses to low temperatures; however, comparatively little is known about these components in tea plants. In this study, we identified a core clock component the LATE ELONGATED HYPOCOTYL, CsLHY, which is mainly expressed in tea plants' mature leaves, flowers, and roots. Notably, CsLHY maintained its circadian rhythmicity of expression in summer, but was disrupted in winter and held a high expression level. Meanwhile, we found that CsLHY expression rhythm was not affected by different photoperiods but was quickly broken by cold, and the low temperature induced and kept CsLHY expression at a relatively high level. Yeast one-hybrid and dual-luciferase assays confirmed that CsLHY can bind to the promoter of Sugars Will Eventually be Exported Transporters 17 (CsSWEET17) and function as a transcriptional activator. Furthermore, suppression of CsLHY expression in tea leaves not only reduced CsSWEET17 expression but also impaired the freezing tolerance of leaves compared to the control. Our results demonstrate that CsLHY plays a positive role in the low-temperature response of tea plants by regulating CsSWEET17 when considered together.

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