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Circadian-regulated expression of a nuclear-encoded plastid sigma factor gene (sigA) in wheat seedlings
K Morikawa1, S Ito, Y Tsunoyama
1Graduate School of Human and Environmental Studies, Kyoto University, Japan.
FEBS Letters
|June 17, 1999
Abstract:
The activity of a light-responsive psbD promoter in plastids is known to be regulated by a circadian clock. However, the mechanism of the circadian regulation of the psbD light-responsive promotor, which is recognized by an Escherichia coli-type RNA polymerase, is not yet known. We examined the time course of mRNA accumulation of two E. coli-type RNA polymerase subunit genes, sigA and rpoA, under a continuous light condition after 12 h light/12 h dark entrainment. Accumulation of the sigA mRNA was found to be regulated by a circadian clock, while rpoA mRNA did not show any significant oscillation throughout the experiment.