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PLANT PHYSIOLOGY , Vol 110, Issue 2 645-655, Copyright © 1996 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Light Suppresses 3-Hydroxy-3-methylglutaryl Coenzyme A Reductase Gene Expression in Arabidopsis thaliana
R. M. Learned
University of California, Section of Molecular and Cellular Biology, Davis, California 95616
3-Hydroxy-3-methylglutaryl (HMG) coenzyme A reductase mRNA accumulates
preferentially in dark-grown Arabidopsis plants. As one step toward
understanding the role that light plays in the regulation of the mevalonate
pathway in plants, we characterized the suppression of HMG1 gene expression
in response to illumination wavelength, duration, and fluence rate. The
accumulation of HMG1 mRNA by dark treatment is suppressed by continuous
exposure to white light and is dependent on the amount of light perceived
during the period of illumination. By using promoter/reporter gene fusions
we also demonstrate that this reaction is mediated by cis-acting elements
that reside in the Arabidopsis HMG1 promoter and, therefore, is likely to
be controlled at the transcriptional level. HMG1 expression is
differentially responsive to continuous blue and red light but not to
far-red light. In contrast, changes in HMG1 mRNA levels were not observed
in response to brief light pulses of any spectrum, suggesting that
continuous illumination is required for sustained and maximal suppression
of HMG coenzyme A reductase expression. Taken together, these data indicate
that light-mediated control of the HMG1 gene is mediated by a regulatory
circuit that monitors aspects of both spectral quality and fluence and
involves either multiple photoreceptors or a single photoreceptor that is
differentially sensitive to both blue and red light.
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