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PLANT PHYSIOLOGY , Vol 104, Issue 3 889-898, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Interactions between Light and the Circadian Clock in the Regulation of CAT2 Expression in Arabidopsis
H. H. Zhong, J. C. Young, E. A. Pease, R. P. Hangarter and C. R. McClung
Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755-3576 (H.H.Z., E.A.P., C.R.M.)
In Arabidopsis seedlings germinated and grown in continuous light, CAT2
mRNA abundance peaks 1 d after imbibition, consistent with the role of
catalase in detoxifying H2O2 generated during the [beta]-oxidation of fatty
acids stored in the seed. A second peak of CAT2 mRNA abundance, of lower
amplitude than the initial peak, appears 6 d after imbibition and may be
associated with the development of photosynthetic competence and induction
of photorespiration. This second peak in steady-state CAT2 mRNA abundance
is regulated by light and is not seen in etiolated seedlings. CAT2 mRNA
accumulation is induced by exposure to high-fluence blue or far-red light
but not by red light. In addition, light induction is unaffected by several
mutations that block blue light-mediated inhibition of hypocotyl elongation
(blu1, blu2, blu3, hy4), suggesting phytochrome involvement. When etiolated
seedlings are transferred to continuous white light, CAT2 mRNA rapidly
(within 30 min) accumulates. It is interesting that in these seedlings CAT2
mRNA abundance undergoes pronounced oscillations with a circadian (24 h)
periodicity, indicating control by the endogenous circadian clock. No such
oscillations are detected in CAT2 mRNA abundance in etiolated seedlings
prior to illumination. Control of CAT2 expression by the circadian clock is
also seen in 5-week-old plants grown in a light-dark cycle and transferred
either to continuous dark or to continuous light; in continuous light the
circadian oscillations in CAT2 mRNA abundance persist for at least five
circadian cycles, indicating the robustness of this circadian rhythm.
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