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Plant Physiol, December 2001, Vol. 127, pp. 1607-1616
Circadian Clock-Regulated Expression of Phytochrome and
Cryptochrome Genes in Arabidopsis1
Réka
Tóth,
Éva
Kevei,
Anthony
Hall,
Andrew J.
Millar,
Ferenc
Nagy, and
László
Kozma-Bognár*
Institute of Plant Biology, Biological Research Center of
the Hungarian Academy of Sciences, P.O. Box 521, H-6701 Szeged,
Hungary (R.T., É.K., F.N., L.K.-B.); and Department of Biological
Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom
(A.H., A.J.M.)
Many physiological and biochemical processes in plants
exhibit endogenous rhythms with a period of about 24 h. Endogenous oscillators called circadian clocks regulate these rhythms. The circadian clocks are synchronized to the periodic environmental changes
(e.g. day/night cycles) by specific stimuli; among these, the most important is the light. Photoreceptors, phytochromes, and
cryptochromes are involved in setting the clock by transducing the
light signal to the central oscillator. In this work, we analyzed the
spatial, temporal, and long-term light-regulated expression patterns of
the Arabidopsis phytochrome (PHYA to
PHYE) and cryptochrome (CRY1 and
CRY2) promoters fused to the luciferase
(LUC+) reporter gene. The results
revealed new details of the tissue-specific expression and light
regulation of the PHYC and CRY1 and
2 promoters. More importantly, the data obtained
demonstrate that the activities of the
promoter::LUC+ constructs,
with the exception of
PHYC::LUC+, display
circadian oscillations under constant conditions. In addition, it is
shown by measuring the mRNA abundance of PHY and CRY genes under constant light conditions that the
circadian control is also maintained at the level of mRNA accumulation.
These observations indicate that the plant circadian clock controls the
expression of these photoreceptors, revealing the formation of a new
regulatory loop that could modulate gating and resetting of the
circadian clock.
1
This work was supported by the Hungarian
Scientific Research Fund (grant nos. F-029163 to L.K.-B. and T-032565
to F.N.), by the Howard Hughes Medical Institute (grant no. 55000325 to
F.N.), by the Human Frontier Research Program (to A.J.M. and F.N.), and by the Biotechnology and Biological Sciences Research Council (grant
no. G08667 to A.J.M.).
*
Corresponding author; e-mail
kozmab{at}nucleus.szbk.u-szeged.hu; fax 36-62-433-434.
© 2001 American Society of Plant Physiologists
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