Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 70, Issue 18, Pages 4975-4990Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erz236
Keywords
Arabidopsis thaliana; blue light; cryptochromes; flavonoids; photoreceptor interaction; solar radiation; sun simulator; transcript abundance; ultraviolet radiation; UVR8
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Funding
- European Plant Phenotyping Network
- Academy of Finland [252548]
- EDUFI Fellowship
- Suomen Kulttuurirahasto
- EMBO Short-Term fellowship [ASTF 570-2016]
- Academy of Finland (Center of Excellence in Molecular Biology of Primary Producers 2014-2019) [307335]
- Academy of Finland (AKA) [252548, 252548] Funding Source: Academy of Finland (AKA)
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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 Ler, 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.
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