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PLANT PHYSIOLOGY , Vol 103, Issue 2 553-564, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Differential Involvement of the Circadian Clock in the Expression of Genes Required for Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase Synthesis, Assembly, and Activation in Arabidopsis thaliana
M. L. Pilgrim and C. R. McClung
Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755-3576
We have investigated the role of the circadian clock in the regulation of
expression of genes required for ribulose-1,5-bisphosphate
carboxylase/oxygenase (Rubisco) synthesis, assembly, and activation.
Circadian oscillations in RCA (the gene encoding Rubisco activase) and RBCS
(the gene encoding Rubisco small subunit) mRNA accumulation, with peak
abundance occurring soon after dawn, occur in Arabidopsis thaliana grown in
a light-dark (LD) photoperiod. These oscillations persist in plants that
have been transferred from LD to either continuous darkness (DD) or
continuous light (LL). In contrast, CPN60[alpha] (the gene encoding
[alpha]-chaperonin) and CPN60[beta] (the gene encoding [beta]-chaperonin)
mRNA abundance oscillates in a diurnal, but not in a circadian, fashion.
Although rapid damping of the circadian oscillation in RCA mRNA abundance
is observed in Arabidopsis that have been grown in LD and then transferred
to DD for 2 d, the circadian oscillations in RCA and RBCS mRNA abundance
persist for at least five continuous cycles in LL, demonstrating the
robustness of the circadian oscillator.
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