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UV-mediated accumulation of flavonoids and glucosinolates is well documented, but much less is known about UV effects on carotenoid content. Carotenoids are involved in a range of plant physiological processes, including photoprotection of the photosynthetic machinery. UV-induced changes in carotenoid profile were quantified in plants (Arabidopsis thaliana) exposed for up to ten days to supplemental UV radiation under growth chamber conditions. UV induces specific changes in carotenoid profile, including increases in antheraxanthin, neoxanthin, violaxanthin and lutein contents in leaves. The extent of induction was dependent on exposure duration. No individual UV-B (UVR8) or UV-A (Cryptochrome or Phototropin) photoreceptor was found to mediate this induction. Remarkably, UV-induced accumulation of violaxanthin could not be linked to protection of the photosynthetic machinery from UV damage, questioning the functional relevance of this UV response. Here, it is argued that plants exploit UV radiation as a proxy for other stressors. Thus, it is speculated that the function of UV-induced alterations in carotenoid profile is not UV protection, but rather protection against other environmental stressors such as high intensity visible light that will normally accompany UV radiation.<\/jats:p>","DOI":"10.3390\/biom12121879","type":"journal-article","created":{"date-parts":[[2022,12,15]],"date-time":"2022-12-15T02:20:57Z","timestamp":1671070857000},"page":"1879","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["UV Radiation Induces Specific Changes in the Carotenoid Profile of Arabidopsis thaliana"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2221-6836","authenticated-orcid":false,"given":"Uthman O.","family":"Badmus","sequence":"first","affiliation":[{"name":"School of Biological, Earth and Environmental Sciences & Environmental Research Institute, University College Cork, Distillery Fields, North Mall, T23 N73K Cork, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaia","family":"Crestani","sequence":"additional","affiliation":[{"name":"School of Biological, Earth and Environmental Sciences & Environmental Research Institute, University College Cork, Distillery Fields, North Mall, T23 N73K Cork, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalie","family":"Cunningham","sequence":"additional","affiliation":[{"name":"School of Biological, Earth and Environmental Sciences & Environmental Research Institute, University College Cork, Distillery Fields, North Mall, T23 N73K Cork, Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6434-393X","authenticated-orcid":false,"given":"Michel","family":"Havaux","sequence":"additional","affiliation":[{"name":"Bioscience and Biotechnology Institute of Aix-Marseille, Aix-Marseille University, CEA, CNRS, UMR7265, CEA\/Cadarache, F-13115 Saint-Paul-lez-Durance, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1716-8876","authenticated-orcid":false,"given":"Otmar","family":"Urban","sequence":"additional","affiliation":[{"name":"Laboratory of Ecological Plant Physiology, Global Change Research Institute, Czech Academy of Sciences, Brno, Belidla 4a, CZ-60300 Brno, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2014-5859","authenticated-orcid":false,"given":"Marcel A. K.","family":"Jansen","sequence":"additional","affiliation":[{"name":"School of Biological, Earth and Environmental Sciences & Environmental Research Institute, University College Cork, Distillery Fields, North Mall, T23 N73K Cork, Ireland"},{"name":"Laboratory of Ecological Plant Physiology, Global Change Research Institute, Czech Academy of Sciences, Brno, Belidla 4a, CZ-60300 Brno, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1146\/annurev.pp.33.060182.002405","article-title":"Light Quality, Photoperception, and Plant Strategy","volume":"33","author":"Smith","year":"1982","journal-title":"Annu. Rev. Plant Physiol. Plant Mol. 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