A circadian morning complex modulates far-red light signaling in Arabidopsis

Oct 29, 2025Nature communications

A morning biological clock controls far-red light response in Arabidopsis

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Circadian BiologyCircadian Biology on OpenScience ā†—PubMed ā†—DOI ā†—OA ā†—

Abstract

The clock regulator TIME FOR COFFEE (TIC) interacts with core clock components and regulates light signals at dawn.

  • TIC forms a 'Morning Complex' with ASSOCIATED1 (CCA1) and LATE ELONGATED (LHY) in the nucleus.
  • This complex co-represses numerous genes, particularly at dawn.
  • The Morning Complex inhibits PHYA and other phyA signaling components by binding to their promoters.
  • Mutants lacking CCA1 and LHY exhibit increased sensitivity to far-red light, similar to tic mutants.
  • The findings suggest a cooperative role of TIC, CCA1, and LHY in regulating light-inhibited hypocotyl growth.

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