Photomorphogenic responses to ultraviolet-B light.
Exposure to ultraviolet B (UV-B) light regulates numerous aspects of plant metabolism, morphology and physiology through the differential expression of hundreds of genes. Photomorphogenic responses to UV-B are mediated by the photoreceptor UV RESISTANCE LOCUS8 (UVR8). Considerable progress has been made in understanding UVR8 action: the structural basis of photoreceptor function, how interaction with CONSTITUTIVELY PHOTOMORPHOGENIC 1 initiates signaling and how REPRESSOR OF UV-B PHOTOMORPHOGENESIS proteins negatively regulate UVR8 action. In addition, recent research shows that UVR8 mediates several responses through interaction with other signaling pathways, in particular auxin signaling. Nevertheless, many aspects of UVR8 action remain poorly understood. Most research to date has been undertaken with Arabidopsis, and it is important to explore the functions and regulation of UVR8 in diverse plant species. Furthermore, it is essential to understand how UVR8, and UV-B signaling in general, regulates processes under natural growth conditions. Ultraviolet B regulates the expression of many genes through UVR8-independent pathways, but the activity and importance of these pathways in plants growing in sunlight are poorly understood.
Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, Bower Building, University of Glasgow, Glasgow, G12 8QQ, UK.
Gareth I
http://orcid.org/0000-0002-1855-4875
GI
Jenkins
D008954:Models, Biological; D009024:Morphogenesis / Q000528:radiation effects*; D010940:Plant Proteins / Q000378:metabolism; D010944:Plants / Q000378:metabolism / Q000528:radiation effects; D015398:Signal Transduction; D014466:Ultraviolet Rays
D010940:Plant Proteins
COP1; RUP proteins; UV-B; UVR8; auxin signaling; photomorphogenesis; photoreceptor