Document Detail

Functional interaction of the circadian clock and UV RESISTANCE LOCUS 8-controlled UV-B signaling pathways in Arabidopsis thaliana.
MedLine Citation:
PMID:  21395889     Owner:  NLM     Status:  MEDLINE    
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.
Balázs Fehér; László Kozma-Bognár; Eva Kevei; Anita Hajdu; Melanie Binkert; Seth Jon Davis; Eberhard Schäfer; Roman Ulm; Ferenc Nagy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-04-26
Journal Detail:
Title:  The Plant journal : for cell and molecular biology     Volume:  67     ISSN:  1365-313X     ISO Abbreviation:  Plant J.     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-06-28     Completed Date:  2012-02-27     Revised Date:  2012-08-03    
Medline Journal Info:
Nlm Unique ID:  9207397     Medline TA:  Plant J     Country:  England    
Other Details:
Languages:  eng     Pagination:  37-48     Citation Subset:  IM    
Copyright Information:
© 2011 The Authors. The Plant Journal © 2011 Blackwell Publishing Ltd.
Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, H-6726 Szeged, Hungary.
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MeSH Terms
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
Nuclear Proteins / physiology
Signal Transduction / physiology*
Stress, Physiological
Time Factors
Transcription Factors / genetics,  metabolism
Transcriptional Activation
Ultraviolet Rays
Grant Support
//Howard Hughes Medical Institute
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Basic-Leucine Zipper Transcription Factors; 0/CCA1 protein, Arabidopsis; 0/Carrier Proteins; 0/Chromosomal Proteins, Non-Histone; 0/ELF3 protein, Arabidopsis; 0/ELF4 protein, Arabidopsis; 0/HY5 protein, Arabidopsis; 0/HYH protein, Arabidopsis; 0/Nuclear Proteins; 0/Transcription Factors; 0/Uvr8 protein, Arabidopsis; 0/constitutive photomorphogenic 1 protein, Arabidopsis

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