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The ELF3 zeitnehmer regulates light signalling to the circadian clock

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  • Harriet G. McWatters

    (University of Warwick)

  • Ruth M. Bastow

    (University of Warwick)

  • Anthony Hall

    (University of Warwick)

  • Andrew J. Millar

    (University of Warwick)

Abstract

The circadian system regulates 24-hour biological rhythms1 and seasonal rhythms, such as flowering2. Long-day flowering plants like Arabidopsis thaliana, measure day length with a rhythm that is not reset at lights-off3, whereas short-day plants measure night length on the basis of circadian rhythm of light sensitivity that is set from dusk2. early flowering 3 (elf3) mutants of Arabidopsis are aphotoperiodic4 and exhibit light-conditional arrhythmia5,6. Here we show that the elf3-7 mutant retains oscillator function in the light but blunts circadian gating of CAB gene activation, indicating that deregulated phototransduction may mask rhythmicity. Furthermore, elf3 mutations confer the resetting pattern of short-day photoperiodism, indicating that gating of phototransduction may control resetting. Temperature entrainment can bypass the requirement for normal ELF3 function for the oscillator and partially restore rhythmic CAB expression. Therefore, ELF3 specifically affects light input to the oscillator, similar to its function in gating CAB activation, allowing oscillator progression past a light-sensitive phase in the subjective evening. ELF3 provides experimental demonstration of the zeitnehmer (‘time-taker’) concept7,8.

Suggested Citation

  • Harriet G. McWatters & Ruth M. Bastow & Anthony Hall & Andrew J. Millar, 2000. "The ELF3 zeitnehmer regulates light signalling to the circadian clock," Nature, Nature, vol. 408(6813), pages 716-720, December.
    • Handle: RePEc:nat:nature:v:408:y:2000:i:6813:d:10.1038_35047079
    DOI: 10.1038/35047079
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    Cited by:

    1. Mathias Foo & Declan G Bates & Ozgur E Akman, 2020. "A simplified modelling framework facilitates more complex representations of plant circadian clocks," PLOS Computational Biology, Public Library of Science, vol. 16(3), pages 1-34, March.
    2. El Batoul Djouani-Tahri & Frédéric Sanchez & Jean-Claude Lozano & François-Yves Bouget, 2011. "A Phosphate-Regulated Promoter for Fine-Tuned and Reversible Overexpression in Ostreococcus: Application to Circadian Clock Functional Analysis," PLOS ONE, Public Library of Science, vol. 6(12), pages 1-10, December.
    3. Maximilian O Press & Amy Lanctot & Christine Queitsch, 2016. "PIF4 and ELF3 Act Independently in Arabidopsis thaliana Thermoresponsive Flowering," PLOS ONE, Public Library of Science, vol. 11(8), pages 1-18, August.

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