Nuclear accumulation of rice UV-B photoreceptors is UV-B- and OsCOP1-independent for UV-B responses

Shan Hu, Yihan Chen, Chongzhen Qian, Hui Ren, Xinwen Liang, Wenjing Tao, Yanling Chen, Jue Wang, Yuan Dong, Jiupan Han, Xinhao Ouyang () and Xi Huang ()
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Shan Hu: Xiamen University
Yihan Chen: Xiamen University
Chongzhen Qian: Xiamen University
Hui Ren: Xiamen University
Xinwen Liang: Xiamen University
Wenjing Tao: Xiamen University
Yanling Chen: Xiamen University
Jue Wang: Xiamen University
Yuan Dong: Xiamen University
Jiupan Han: Xiamen University
Xinhao Ouyang: Xiamen University
Xi Huang: Xiamen University

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract In plants, the conserved plant-specific photoreceptor UV RESISTANCE LOCUS 8 (UVR8) perceives ultraviolet-B (UV-B) light and mediates UV-B-induced photomorphogenesis and stress acclimation. In this study, we reveal that UV-B light treatment shortens seedlings, increases stem thickness, and enhances UV-B stress tolerance in rice (Oryza sativa) via its two UV-B photoreceptors OsUVR8a and OsUVR8b. Although the rice and Arabidopsis (Arabidopsis thaliana) UVR8 (AtUVR8) photoreceptors all form monomers in response to UV-B light, OsUVR8a, and OsUVR8b function is only partially conserved with respect to AtUVR8 in UV-B-induced photomorphogenesis and stress acclimation. UV-B light and CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) promote the nuclear accumulation of AtUVR8; by contrast, OsUVR8a and OsUVR8b constitutively localize to the nucleus via their own nuclear localization signals, independently of UV-B light and the RING-finger mutation of OsCOP1. We show that OsCOP1 negatively regulates UV-B responses, and shows weak interaction with OsUVR8s, which is ascribed to the N terminus of OsCOP1, which is conserved in several monocots. Furthermore, transcriptome analysis demonstrates that UV-B-responsive gene expression differs globally between Arabidopsis and rice, illuminating the evolutionary divergence of UV-B light signaling pathways between monocot and dicot plants.

Date: 2024
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DOI: 10.1038/s41467-024-50755-6

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