Scientific article

Functional interaction of the circadian clock and UV RESISTANCE LOCUS 8-controlled UV-B signaling pathways in Arabidopsis thaliana

Published inPlant journal, vol. 67, no. 1, p. 37-48
Publication date2011

Circadian clocks regulate many molecular and physiological processes in Arabidopsis (Arabidopsis thaliana), allowing the timing of these processes to occur at the most appropriate time of the day in a 24-h period. The accuracy of timing relies on the synchrony of the clock and the environmental day/night cycle. Visible light is the most potent signal for such synchronization, but light-induced responses are also rhythmically attenuated (gated) by the clock. Here, we report a similar mutual interaction of the circadian clock and non-damaging photomorphogenic UV-B light. We show that low-intensity UV-B radiation acts as entraining signal for the clock. UV RESISTANCE LOCUS 8 (UVR8) and CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) are required, but ELONGATED HYPOCOTYL 5 (HY5) and HY5 HOMOLOG (HYH) are dispensable for this process. UV-B responsiveness of clock gene expression suggests that photomorphogenic UV-B entrains the plant clock through transcriptional activation. We also demonstrate that UV-B induction of gene expression under these conditions is gated by the clock in a HY5/HYH-independent manner. The arrhythmic early flowering 3-4 mutant showed non-gated, high-level gene induction by UV-B, yet displayed no increased tolerance to UV-B stress. Thus, the temporal restriction of UV-B responsiveness by the circadian clock can be considered as saving resources during acclimation without losing fitness.

  • Arabidopsis/genetics/physiology/radiation effects
  • Arabidopsis Proteins/genetics/metabolism/physiology
  • Basic-Leucine Zipper Transcription Factors/physiology
  • Carrier Proteins/physiology
  • Chromosomal Proteins, Non-Histone/genetics/metabolism
  • Circadian Clocks/physiology/radiation effects
  • Circadian Rhythm/physiology/radiation effects
  • Gene Expression Regulation, Plant/radiation effects
  • Mutation
  • Nuclear Proteins/physiology
  • Photoperiod
  • Signal Transduction/physiology
  • Stress, Physiological
  • Time Factors
  • Transcription Factors/genetics/metabolism
  • Transcriptional Activation
  • Ultraviolet Rays
Affiliation Not a UNIGE publication
Citation (ISO format)
FEHÉR, Balázs et al. Functional interaction of the circadian clock and UV RESISTANCE LOCUS 8-controlled UV-B signaling pathways in Arabidopsis thaliana. In: Plant journal, 2011, vol. 67, n° 1, p. 37–48. doi: 10.1111/j.1365-313X.2011.04573.x
Main files (1)
Article (Published version)
ISSN of the journal0960-7412

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