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How exactly does UVR8 act as a photoreceptor? UVR8 is unique among photoreceptors in that it doesDNA is chemically the same in all organisms and thus similarly susceptible to damage by UV-B in plants and humans. Things are, however, additionally complicated lites that absorb UV-B and thereby prote tissues.Why is UV-B an issue for plants? climation involves, for example, increased levels of DNA repair enzymes and accumulation of ‘sunscreen ’ metabo-balance the response, UVR8 is inactivated by regulated re-dimerization. Apart from their importance for plants, UVR8 and its interacting protein COP1 have already proved useful for the optogenetic toolkit used to engineer synthetic light-dependent responses. What is UV-B radiation? Ultraviolet (UV) radiation is the portion of the electro-magnetic spectrum between X-rays and visible light that is conventionally divided into UV-A (315 to 400 nm), UV-B (280 to 315 nm) and UV-C (100 to 280 nm) radi-ation. Whereas UV-C is entirely absorbed by the strato-spheric ozone layer, UV-A and some UV-B radiation reach the Earth’s surface and thus can affect the bio-sphere. UV-B is the most harmful form of radiation from sunlight reaching the Earth mainly because it can cause photochemical DNA damage. Exposure to UV-B is thus particularly notorious for being a major risk factor formetabolites, antioxidants and DNA repair enzymes. To which can be appreciated in a green landscape on a hike in summer. But growth in bright sunlight is hazardous-Q&A: How do plants sens UV-B radiation