| Functional interaction of the circadian clock and UV RESISTANCE LOCUS 8-controlled UV-B signaling pathways in Arabidopsis thaliana. | |
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MedLine Citation:
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PMID: 21395889 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Circadian clocks regulate many molecular and physiological processes in Arabidopsis (Arabidopsis thaliana) with a 24 h period, allowing the timing of these processes to the most appropriate time of the day. 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. |
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Authors:
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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:
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Type: JOURNAL ARTICLE Date: 2011-3-14 |
Journal Detail:
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Title: The Plant journal : for cell and molecular biology Volume: - ISSN: 1365-313X ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9207397 Medline TA: Plant J Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Blackwell Publishing Ltd and the Society for Experimental Biology. |
Affiliation:
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Institute of Plant Biology, Biological Research Centre of the Hungarian Academy of Sciences, H-6726 Szeged, Hungary Faculty of Biology, Institute of Biology II/Botany, University of Freiburg, D-79104 Freiburg, Germany Present address: Department of Plant Biology, University of Geneva, Sciences III, CH-1211 Geneva 4, Switzerland Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, D-50829, Cologne, Germany Centre for Biological Signalling Studies (BIOSS), University of Freiburg, D-79104 Freiburg, Germany School of Biological Sciences, University of Edinburgh, EH9 3JR Edinburgh, United Kingdom. |
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