The Arabidopsis SRR1 gene mediates phyB signaling and is required for normal circadian clock function

Plants possess several photoreceptors to sense the light environment. In Arabidopsis cryptochromes and phytochromes play roles in photomorphogenesis and in the light input pathways that synchronize the circadian clock with the external world. We have identified SRR1 (sensitivity to red light reduced...

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Bibliographic Details
Published in:Genes & development 2003-01, Vol.17 (2), p.256-268
Main Authors: Staiger, Dorothee, Allenbach, Laure, Salathia, Neeraj, Fiechter, Vincent, Davis, Seth J, Millar, Andrew J, Chory, Joanne, Fankhauser, Christian
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Arabidopsis - genetics
Arabidopsis - physiology
Arabidopsis - radiation effects
Arabidopsis Proteins - genetics
Arabidopsis Proteins - physiology
Circadian Rhythm - genetics
Circadian Rhythm - physiology
Gene Expression Regulation, Plant
Genes, Plant
Molecular Sequence Data
Mutation
Photoreceptor Cells
Phylogeny
Phytochrome - genetics
Phytochrome - physiology
Phytochrome B
Research Paper
Sequence Homology, Amino Acid
Signal Transduction
Transcription Factors - genetics
Transcription Factors - physiology
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Summary:Plants possess several photoreceptors to sense the light environment. In Arabidopsis cryptochromes and phytochromes play roles in photomorphogenesis and in the light input pathways that synchronize the circadian clock with the external world. We have identified SRR1 (sensitivity to red light reduced), a gene that plays an important role in phytochrome B (phyB)-mediated light signaling. The recessive srr1 null allele and phyB mutants display a number of similar phenotypes indicating that SRR1 is required for normal phyB signaling. Genetic analysis suggests that SRR1 works both in the phyB pathway but also independently of phyB. srr1 mutants are affected in multiple outputs of the circadian clock in continuous light conditions, including leaf movement and expression of the clock components, CCA1 and TOC1. Clock-regulated gene expression is also impaired during day-night cycles and in constant darkness. The circadian phenotypes of srr1 mutants in all three conditions suggest that SRR1 activity is required for normal oscillator function. The SRR1 gene was identified and shown to code for a protein conserved in numerous eukaryotes including mammals and flies, implicating a conserved role for this protein in both the animal and plant kingdoms.
ISSN:0890-9369
1549-5477
DOI:10.1101/gad.244103