Abstract
Circadian clocks are synchronized by environmental cues such as light. Photoreceptor-deficient Arabidopsis thaliana mutants were used to measure the effect of light fluence rate on circadian period in plants. Phytochrome B is the primary high-intensity red light photoreceptor for circadian control, and phytochrome A acts under low-intensity red light. Cryptochrome 1 and phytochrome A both act to transmit low-fluence blue light to the clock. Cryptochrome 1 mediates high-intensity blue light signals for period length control. The presence of cryptochromes in both plants and animals suggests that circadian input pathways have been conserved throughout evolution.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Arabidopsis / genetics
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Arabidopsis / physiology*
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Arabidopsis Proteins
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Biological Clocks / physiology*
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Circadian Rhythm / physiology*
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Cryptochromes
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Drosophila Proteins*
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Eye Proteins*
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Flavoproteins / genetics
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Flavoproteins / physiology*
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Light
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Mutation
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Photoreceptor Cells*
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Photoreceptor Cells, Invertebrate*
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Phytochrome / genetics
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Phytochrome / physiology*
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Phytochrome A
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Phytochrome B
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Plants, Genetically Modified
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Receptors, G-Protein-Coupled
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Signal Transduction
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Transcription Factors*
Substances
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Arabidopsis Proteins
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CRY1 protein, Arabidopsis
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Cryptochromes
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Drosophila Proteins
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Eye Proteins
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Flavoproteins
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PHYA protein, Arabidopsis
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PHYB protein, Arabidopsis
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Phytochrome A
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Receptors, G-Protein-Coupled
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Transcription Factors
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cry protein, Drosophila
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Phytochrome
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Phytochrome B