转录因子在植物响应UV-B辐射中的调控作用

doi:10.11983/CBB24165

植物学报 ›› 2025, Vol. 60 ›› Issue (3): 449-459.DOI: 10.11983/CBB24165 cstr: 32102.14.CBB24165

转录因子在植物响应UV-B辐射中的调控作用

陈鹏翔, 王波, 王子俊, 韩榕^*()

山西师范大学生命科学学院, 山西师范大学植物大分子逆境响应山西省重点实验室, 太原 030031

收稿日期:2024-10-30 接受日期:2025-01-20 出版日期:2025-05-10 发布日期:2025-01-21
通讯作者: *韩榕, 二级教授, 博士生导师。长期从事植物逆境响应研究, 重点关注UV-B辐射下小麦和拟南芥等植物在分子细胞学水平上的响应机制。主持完成多项国家自然科学基金和山西省自然科学基金项目。在Plant Physiology and Biochemistry、Environmental Science: Nano及Cell Research等国际重要核心期刊上发表高水平研究论文100余篇。曾获“山西省高等学校科技进步奖”一等奖和二等奖以及“陕西省科学技术奖”二等奖等奖项。E-mail: hanrong@sxnu.edu.cn
基金资助:
山西省基础研究计划(202203021212395);山西省研究生教育创新项目(2022Y494)

The Regulatory Roles of the Transcription Factors in Plant's Response to UV-B Radiation

Chen Pengxiang, Wang Bo, Wang Zijun, Han Rong^*()

Shanxi Key Laboratory of Plant Macromolecular Stress Response, School of Life Sciences, Shanxi Normal University, Taiyuan 030031, China

Received:2024-10-30 Accepted:2025-01-20 Online:2025-05-10 Published:2025-01-21
Contact: *E-mail: hanrong@sxnu.edu.cn

摘要/Abstract

摘要： 作为太阳光的固有成分, UV-B对植物生长发育有重要影响。随着对UV-B研究的深入, 人们认识到UV-B不仅是环境胁迫因子, 还是植物生长过程中的重要信号分子, 适度的UV-B辐射对植物生长具有促进作用。UVR8是UV-B特有的光感受器, 在植物响应UV-B过程中发挥不可替代的作用, 且其功能受上、下游转录因子调节。目前, 已知BBX、WRKY、MYB和PIF等多种转录因子参与调控UV-B辐射下的下胚轴伸长、主根长度、叶片大小及形态、开花周期和花青素合成等过程。该文主要综述了UVR8在UV-B信号通路中的分子机制, 并对转录因子在UV-B辐射过程中的调控机理进行总结, 以期为相关研究提供参考。

关键词: UVR8, 转录因子, UV-B辐射, 植物

Abstract: UV-B, as an inherent constituent of sunlight, exerts a crucial influence on the growth and development of plants. Recent studies showed that UV-B is not merely an environmental stressor, but also a functional signal molecule that is able to promote plant growth under moderate radiation level. The protein UVR8, as a unique photoreceptor specific to UV-B, plays an irreplaceable role in the plant's response to UV-B, whose functions are regulated by both upstream and downstream transcription factors. At present, a variety of transcription factors such as BBXs, WRKYs, MYBs, and PIFs have been reported to be involved in UV-B regulated processes like hypocotyl elongation, primary root length, leaf size and shape, flowering cycle, and anthocyanin synthesis. This article reviews the molecular mechanisms of UVR8 in the UV-B signaling pathway and summarizes the regulatory mechanisms of the transcription factors during the UV-B radiation process, to provide reference for relevant research.

Key words: UVR8, transcription factor, UV-B radiation, plant

陈鹏翔, 王波, 王子俊, 韩榕. 转录因子在植物响应UV-B辐射中的调控作用. 植物学报, 2025, 60(3): 449-459.

Chen Pengxiang, Wang Bo, Wang Zijun, Han Rong. The Regulatory Roles of the Transcription Factors in Plant's Response to UV-B Radiation. Chinese Bulletin of Botany, 2025, 60(3): 449-459.

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链接本文: https://www.chinbullbotany.com/CN/10.11983/CBB24165

https://www.chinbullbotany.com/CN/Y2025/V60/I3/449

图/表 2

表1 转录因子在植物响应UV-B信号通路中的作用

Table 1 Function of transcription factors in plant response UV-B radiation

家族	成员	顺式元件	作用	参考文献
bZIP	HY5	T/G-box、E-box、GATA-box、ACE- box、Z-box和C-box	调节下胚轴伸长, 在植物色素合成和光形态建成中起核心作用	Stracke et al., 2010a; Lockhart, 2014; Yao et al., 2021; Zhou et al., 2022b
WRKY	WRKY36	W-box	促进下胚轴伸长及叶片发育	Yang et al., 2018; Demarsy, 2022; Goyal et al., 2023
WRKY	WRKY32	W-box	促进下胚轴伸长, 抑制拟南芥子叶展开	Zhou et al., 2022a; Demarsy, 2022
MYB	MYB11、MYB12和MYB111	R2R3-MYB-binding motif	抑制下胚轴伸长, 调控花青素生物合成, 影响次生代谢物合成	Stracke et al., 2007, 2010b; Petroni et al., 2008; Zhang et al., 2017; Wang et al., 2021b; Zhao et al., 2023
MYB	MYB73/77	R2R3-MYB-binding motif	正调控生长素响应基因的表达, 促进下胚轴伸长和侧根生长	Yang et al., 2020; Xu and Zhu, 2020; Yang and Liu, 2020; Zhang et al., 2022
BBX	BBX11	T/G-BOX	调节拟南芥下胚轴伸长, 参与植物光形态建成	Job et al., 2022; Ponnu, 2022
	BBX20、BBX21、BBX22和BBX31	T/G-BOX	光形态建成正调控因子	Heng et al., 2019; Bursch et al., 2020; Podolec et al., 2022
	BBX24	T/G-BOX	光形态建成负调控因子	Jiang et al., 2012; Gangappa and Botto, 2014
PIF	PIF4和PIF5	G-box	抑制下胚轴伸长, 参与植物光形态建成	Sharma et al., 2019; Küpers et al., 2020; Podolec et al., 2021; Zhao et al., 2023; Sharma et al., 2023
TCP	TCP4	GGACCAC	调控植物生长发育, 参与光响应	Li et al., 2024
BES	BES1/BIM1	E-box和CGTGT/CG	调节植物激素信号转导, 影响植物生长发育	Liang et al., 2020; Shi and Liu, 2021

图1 转录因子参与植物UV-B信号通路模型紫外线B (UV-B)激活其受体UVR8后, UVR8解聚为单体进入细胞核, 进而引发下游信号通路。UVR8直接与E3泛素连接酶COP1作用, 释放COP1降解底物HY5以及BBX20-22、BBX24、PIF4和PIF5转录因子。同时, UVR8与转录因子WRKY36相互作用增强和稳定HY5的转录活性, HY5启动下游转录因子BBX11、BBX31和MYB12, 从而调控植物色素合成与光形态建成。UVR8可抑制MYB73/MYB77和BES1/BIM1的DNA结合活性, 也可促进MYB13和TCP4对下游基因的激活, 从而调控下游信号通路。实线箭头和实线T型分别表示激活和抑制; 虚线表示有待实验验证。

Figure 1 Model of transcription factors involved in plant's UV-B signaling pathway Upon ultraviolet-B (UV-B) irradiation, its receptor UVR8 gets activated and subsequently depolymerizes into monomers, which then are translocated into the nucleus, instigating the downstream signaling pathways. UVR8 directly interacts with the E3 ubiquitin ligase COP1, resulting in the release of HY5, as well as the transcription factors BBX20-22, 24, PIF4 and PIF5 that would otherwise be degraded by COP1. On the other hand, UVR8 interacts with the transcription factor WRKY36 to potentiate and stabilize the transcriptional activity of HY5. HY5 triggers the downstream transcription factors BBX11, BBX31 and MYB12, orchestrating the regulation of plant pigment biosynthesis and photomorphogenesis. Moreover, UVR8 can inhibit the DNA-binding activities of MYB73/MYB77 and BES1/BIM1, and also promote the activation of downstream gene initiation by MYB13 and TCP4, thereby regulating the downstream signaling pathways. Solid arrows and T-lines represent activation and repression, respectively; the dotted lines represent that to be verified.

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转录因子在植物响应UV-B辐射中的调控作用

The Regulatory Roles of the Transcription Factors in Plant's Response to UV-B Radiation

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