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Plant Physiol, May 2000, Vol. 123, pp. 381-392
Integrated Temporal Regulation of the Photorespiratory Pathway.
Circadian Regulation of Two Arabidopsis Genes Encoding Serine
Hydroxymethyltransferase1
C. Robertson
McClung,*
Meier
Hsu,
Janet E.
Painter,
Jennifer
M.
Gagne,
Sharon D.
Karlsberg, and
Patrice A.
Salomé
Department of Biological Sciences, Dartmouth College, Hanover, New
Hampshire 03755-3576
The photorespiratory pathway is comprised of enzymes localized
within three distinct cellular compartments: chloroplasts, peroxisomes,
and mitochondria. Photorespiratory enzymes are encoded by nuclear
genes, translated in the cytosol, and targeted into these distinct
subcellular compartments. One likely means by which to regulate the
expression of the genes encoding photorespiratory enzymes is
coordinated temporal control. We have previously shown in Arabidopsis
that a circadian clock regulates the expression of the nuclear genes
encoding both chloroplastic (Rubisco small subunit and Rubisco
activase) and peroxisomal (catalase) components of the photorespiratory
pathway. To determine whether a circadian clock also regulates the
expression of genes encoding mitochondrial components of the
photorespiratory pathway, we characterized a family of Arabidopsis
serine hydroxymethyltransferase (SHM)
genes. We examined mRNA accumulation for two of these family members, including one probable photorespiratory gene (SHM1) and
a second gene expressed maximally in roots (SHM4), and
show that both exhibit circadian oscillations in mRNA abundance that
are in phase with those described for other photorespiratory genes. In
addition, we show that SHM1 mRNA accumulates in
light-grown seedlings, although this response is probably an indirect
consequence of the induction of photosynthesis and photorespiration by illumination.
1
This work was supported by grants from the
National Science Foundation (to C.R.M.) and by an institutional grant
from the American Cancer Society, administered through the Norris
Cotton Cancer Center at Dartmouth. M.H. and J.E.P. were supported by Howard Hughes Undergraduate Research Internships, S.D.K. was supported through the National Science Foundation Research Experience for Undergraduates Program, and S.D.K. and J.M.G. were supported through the Richter Foundation at Dartmouth.
*
Corresponding author; e-mail mcclung{at}dartmouth.edu; fax
603-646-1347.
© 2000 American Society of Plant Physiologists
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