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How do cryptochromes and UVR8 interact in natural and simulated sunlight?
Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Centre (ViPS), University of Helsinki, Helsinki, Finland.
Research Area of Plant Quality and Food Security, Leibniz Institute of Vegetable and Ornamental Crops e. V., Grossbeeren, Germany.
Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Centre (ViPS), University of Helsinki, Helsinki, Finland.
Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Centre (ViPS), University of Helsinki, Helsinki, Finland.
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2019 (English)In: Journal of Experimental Botany, ISSN 0022-0957, E-ISSN 1460-2431Article in journal (Refereed) Epub ahead of print
Abstract [en]

Cryptochromes (CRYs) and UV RESISTANCE LOCUS 8 (UVR8) photoreceptors perceive UV-A/blue (315–500 nm) and UV-B (280–315 nm) radiation in plants, respectively. While the roles of CRYs and UVR8 have been studied in separate controlled environment experiments, little is known about the interaction between these photoreceptors. Here, Arabidopsis thaliana wild-type Ler, CRYs and UVR8 photoreceptor mutants (uvr82, cry1cry2 and cry1cry2uvr82), and a flavonoid biosynthesis defective mutant (tt4) were grown in a sun simulator. Plants were exposed to filtered radiation for 17 d or for 6 h, to study the effects of blue, UV-A and UV-B radiation. Both CRYs and UVR8 independently enabled growth and survival of plants under solar levels of UV, while their joint absence was lethal under UV-B. CRYs mediated gene expression under blue light. UVR8 mediated gene expression under UV-B radiation, and in the absence of CRYs, also under UV-A. This negative regulation of UVR8-mediated gene expression by CRYs was also observed for UV-B. The accumulation of flavonoids was also consistent with this interaction between CRYs and UVR8. In conclusion, we provide evidence for an antagonistic interaction between CRYs and UVR8 and a role of UVR8 in UV-A perception.

Place, publisher, year, edition, pages
Oxford University Press, 2019.
Keywords [en]
Arabidopsis thaliana, blue light, cryptochromes, flavonoids, photoreceptor interaction, sun simulator, solar radiation, transcript abundance, ultraviolet radiation, UVR8
National Category
Genetics Botany
Research subject
Biology
Identifiers
URN: urn:nbn:se:oru:diva-74549DOI: 10.1093/jxb/erz236OAI: oai:DiVA.org:oru-74549DiVA, id: diva2:1319695
Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-19Bibliographically approved

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Morales, Luis Orlando

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