How plants cope with UV-B: from perception to response. (June 2017)

• Record Type: Journal Article
• Authors: Yin, Ruohe; Ulm, Roman
• Is Part Of: Current opinion in plant biology. Volume 37(2017)
• Page Start: 42
• Page End: 48
• Publication Date: 2017-06
• Subjects: Plant molecular biology -- Periodicals; 571.205
• DOI: 10.1016/j.pbi.2017.03.013
• Languages: English
• ISSNs: 1369-5266

Abstract

Highlights: The homodimeric UV-B photoreceptor UVR8 monomerizes in response to UV-B reception. Monomeric UVR8 interacts with the E3 ubiquitin ligase COP1 via two distinct domains. Active UVR8 accumulates in the nucleus in a COP1-dependent manner. Pathway is evolutionarily conserved from a unicellular green alga to higher plants. UVR8 induces UV-B acclimation, which contributes to enhanced UV-B tolerance. Abstract : Ultraviolet-B radiation (UV-B) is an intrinsic part of the solar radiation that reaches the Earth's surface and affects the biosphere. Plants have evolved a specific UV-B signaling pathway mediated by the UVR8 photoreceptor that regulates growth, development, and acclimation. Major recent advances have contributed to our understanding of the UVR8 photocycle, UV-B-responsive protein-protein interactions, regulation of UVR8 subcellular localization, and UVR8-regulated physiological responses. Here, we review the latest progress in our understanding of UVR8 signaling and UV-B responses, which includes studies in the unicellular alga Chlamydomonas reinhardtii and the flowering plant Arabidopsis.