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The photoreceptor UVR8 mediates the perception of both UV-B and UV-A wavelengths up to 350 nm of sunlight with responsivity moderated by cryptochromes
Organismal and Evolutionary Biology, Faculty of Biological and Environmental Sciences, and Viikki Plant Science Centre, University of Helsinki, Helsinki, Finland.ORCID iD: 0000-0002-4972-9332
Örebro University, School of Science and Technology. (Örebro Life Science Center)ORCID iD: 0000-0002-8834-4064
School of Science and Technology, Örebro University, Örebro, Sweden. (Örebro Life Science Center)
Organismal and Evolutionary Biology, Faculty of Biological and Environmental Sciences, and Viikki Plant Science Centre, University of Helsinki, Helsinki, Finland.
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2020 (English)In: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040Article in journal (Refereed) Accepted
Abstract [en]

The photoreceptors UV RESISTANCE LOCUS 8 (UVR8) and CRYPTOCHROMES 1 and 2 (CRYs) play major roles in the perception of UV-B (280–315 nm) and UV-A/blue radiation (315–500 nm), respectively. However, it is poorly understood how they function in sunlight. The roles of UVR8 and CRYs were assessed in a factorial experiment with Arabidopsis thaliana wild-type and photoreceptor mutants exposed to sunlight for 6 h or 12 h under five types of filters with cut-offs in UV and blue-light regions. Transcriptome-wide responses triggered by UV-B and UV-A wavelengths shorter than 350 nm (UV-Asw) required UVR8 whereas those induced by blue and UV-A wavelengths longer than 350 nm (UV-Alw) required CRYs. UVR8 modulated gene expression in response to blue light while lack of CRYs drastically enhanced gene expression in response to UV-B and UV-Asw. These results agree with our estimates of photons absorbed by these photoreceptors in sunlight and with in vitro monomerization of UVR8 by wavelengths up to 335 nm. Motif enrichment analysis predicted complex signaling downstream of UVR8 and CRYs. Our results highlight that it is important to use UV waveband definitions specific to plants’ photomorphogenesis as is routinely done in the visible region.

Place, publisher, year, edition, pages
Blackwell Publishing, 2020.
Keywords [en]
Arabidopsis thaliana, blue light, cryptochrome, gene expression, photoreceptor interaction, solar radiation, ultraviolet radiation, UVR8
National Category
Botany Biochemistry and Molecular Biology
Research subject
Biochemistry
Identifiers
URN: urn:nbn:se:oru:diva-79340DOI: 10.1111/pce.13752PubMedID: 32167576OAI: oai:DiVA.org:oru-79340DiVA, id: diva2:1387909
Funder
Swedish Research Council Formas, 942-2015-516Knowledge Foundation, 20130164Academy of Finland, 252548Academy of Finland, 307335Available from: 2020-01-22 Created: 2020-01-22 Last updated: 2020-03-25Bibliographically approved

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The photoreceptor UVR8 mediates the perception of both UV-B and UV-A wavelengths up to 350 nm of sunlight with responsivity moderated by cryptochromes(2717 kB)5 downloads
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O'Hara, AndrewStrid, Åke

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