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Vol. 17, No. 2, pp. 256-268, January 15, 2003
1 Department of Molecular Biology, 1211 Genève 4, Switzerland; 2 Institute for Plant Sciences, Swiss Federal
Institute of Technology, ETH Center, Zurich, Switzerland;
3 Department of Biological Sciences, University of Warwick,
Coventry, CV4 7AL, UK; 4 The Howard Hughes Medical Institute
and Plant Biology Laboratory, The Salk Institute for Biological
Studies, La Jolla, California 92037, USA
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.
[Key Words: Circadian rhythm; light-signaling; phytochrome B; Arabidopsis thaliana]
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