The regulation of circadian period by phototransduction pathways in Arabidopsis

Science. 1995 Feb 24;267(5201):1163-6. doi: 10.1126/science.7855596.


Transgenic Arabidopsis plants expressing a luciferase gene fused to a circadian-regulated promoter exhibited robust rhythms in bioluminescence. The cyclic luminescence has a 24.7-hour period in white light but 30- to 36-hour periods under constant darkness. Either red or blue light shortened the period of the wild type to 25 hours. A phytochrome-deficient mutation lengthened the period in continuous red light but had little effect in continuous blue light, whereas seedlings carrying mutations that activate light-dependent pathways in darkness maintained shorter periods in constant darkness. These results suggest that both phytochrome- and blue light-responsive photoreceptor pathways control the period of the circadian clock.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Arabidopsis / genetics
  • Arabidopsis / physiology*
  • Arabidopsis Proteins*
  • Biological Clocks* / genetics
  • Carrier Proteins / genetics
  • Circadian Rhythm* / genetics
  • Darkness
  • Gene Expression Regulation, Plant
  • Genes, Plant*
  • Light*
  • Light-Harvesting Protein Complexes
  • Luciferases / genetics
  • Luminescence
  • Photosynthetic Reaction Center Complex Proteins*
  • Photosystem II Protein Complex*
  • Plant Proteins*
  • Plants, Genetically Modified
  • Recombinant Fusion Proteins


  • Arabidopsis Proteins
  • CAB1 protein, Arabidopsis
  • Carrier Proteins
  • Light-Harvesting Protein Complexes
  • Photosynthetic Reaction Center Complex Proteins
  • Photosystem II Protein Complex
  • Plant Proteins
  • Recombinant Fusion Proteins
  • Luciferases