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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.

plant physiology

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