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Cryptochromes are required for phytochrome signaling to the circadian clock but not for rhythmicity

Academic Article
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Overview

authors

  • Devlin, P. F.
  • Kay, Steve A.

publication date

  • December 2000

journal

  • Plant Cell  Journal

abstract

  • The circadian clock is entrained to the daily cycle of day and night by light signals at dawn and dusk. Plants make use of both the phytochrome (phy) and cryptochrome (cry) families of photoreceptors in gathering information about the light environment for setting the clock. We demonstrate that the phytochromes phyA, phyB, phyD, and phyE act as photoreceptors in red light input to the clock and that phyA and the cryptochromes cry1 and cry2 act as photoreceptors in blue light input. phyA and phyB act additively in red light input to the clock, whereas cry1 and cry2 act redundantly in blue light input. In addition to the action of cry1 as a photoreceptor that mediates blue light input into the clock, we demonstrate a requirement of cry1 for phyA signaling to the clock in both red and blue light. Importantly, Arabidopsis cry1 cry2 double mutants still show robust rhythmicity, indicating that cryptochromes do not form a part of the central circadian oscillator in plants as they do in mammals.

subject areas

  • Base Sequence
  • Circadian Rhythm
  • Cryptochromes
  • DNA Primers
  • Darkness
  • Drosophila Proteins
  • Epistasis, Genetic
  • Eye Proteins
  • Flavoproteins
  • Light
  • Mutation
  • Photoreceptor Cells, Invertebrate
  • Phytochrome
  • Receptors, G-Protein-Coupled
  • Signal Transduction
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Identity

PubMed Central ID

  • PMC102233

International Standard Serial Number (ISSN)

  • 1040-4651

Digital Object Identifier (DOI)

  • 10.1105/tpc.12.12.2499

PubMed ID

  • 11148293
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Additional Document Info

start page

  • 2499

end page

  • 2509

volume

  • 12

issue

  • 12

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