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- Title
How do cryptochromes and UVR8 interact in natural and simulated sunlight?
- Authors
Rai, Neha; Neugart, Susanne; Yan, Yan; Wang, Fang; Siipola, Sari M; Lindfors, Anders V; Winkler, Jana Barbro; Albert, Andreas; Brosché, Mikael; Lehto, Tarja; Morales, Luis O; Aphalo, Pedro J
- Abstract
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 wild-type L er , CRYs and UVR8 photoreceptor mutants (uvr8-2 , cry1cry2 and cry1cry2uvr8-2), 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.
- Subjects
ULTRAVIOLET radiation; GENETIC regulation; CRYPTOCHROMES; BLUE light; SUNSHINE; PLANT growth
- Publication
Journal of Experimental Botany, 2019, Vol 70, Issue 18, p4975
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/erz236