J Integr Plant Biol.

• Research Article • Previous Articles    

The LUX–SWI3C module regulates photoperiod sensitivity in Arabidopsis thaliana

Jianhao Wang1,2†, Huan Liu1†, Hong Li1†, Fan Wang1†, Songguang Yang2, Lin Yue1, Shuangrong Liu1, Baohui Liu1, Mingkun Huang3*, Fanjiang Kong1* and Zhihui Sun1*   

  1. 1. Guangdong Key Laboratory of Plant Adaptation and Molecular Design, Guangzhou Key Laboratory of Crop Gene Editing, Innovative Center of Molecular Genetic and Evolution, School of Life Science, Guangzhou University, Guangzhou 510006, China
    2. Guangdong Key Laboratory for New Technology Research of Vegetables, Vegetable Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
    3. Jiangxi Provincial Key Laboratory of Ex Situ Plant Conservation and Utilization, Lushan Botanical Garden, Chinese Academy of Sciences, Jiangxi 332000, China

    These authors contributed equally to this work.
    *Correspondences: Mingkun Huang (huangmk@lsbg.cn); Fanjiang Kong (kongfj@gzhu.edu.cn); and Zhihui Sun (szh@gzhu.edu.cn; Dr. Sun is fully responsible for the distribution of all materials associated with this article)
  • Received:2024-10-30 Accepted:2025-02-18 Online:2025-03-19
  • Supported by:
    The research was supported by the Joint Funding Project of Guangzhou Municipal Government, Universities (Academies) and Enterprises (2023A03J0049 to F.K.), the Open Competition Program of Top Ten Critical Priorities of Agricultural Science and Technology Innovation for the 14th Five‐Year Plan of Guangdong Province (2022SDZG05 to F.K. and B.L.), and the National Natural Science Foundation of China (32090064 to F.K., 32301824 to J.W., 32401857 to Z.S.,32201866 to F.W., and 32301823 to Hu. L.).

Abstract: In plants, the photoperiod sensitivity directly influences flowering time, which in turn affects latitudinal adaptation and yield. However, research into the mechanisms underlying photoperiod sensitivity, particularly those mediated by epigenetic regulation, is still in its nascent stages. In this study, we analyzed the regulation of photoperiod sensitivity in Arabidopsis thaliana. We demonstrate that the evening complex LUX ARRYTHMO (LUX) and the chromatin remodeling factor SWITCH/SUCROSE NONFERMENTING 3C (SWI3C) regulate GI locus chromatin compaction and H3K4me3 modification levels at the GIGANTEA locus under different photoperiod conditions. This mechanism is one of the key factors that allow plants to distinguish between long-day and short-day photoperiods. Our study provides insight into how the LUX–SWI3C module regulates photoperiod sensitivity at the epigenetic level.

Key words: chromatin remodeling, circadian clock, evening complex, histone modification, photoperiod sensitivity

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