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PLANT PHYSIOLOGY , Vol 101, Issue 3 801-808, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Arabidopsis rbcS Genes Are Differentially Regulated by Light
A. Dedonder, R. Rethy, H. Fredericq, M. Van Montagu and E. Krebbers
Laboratory of Plant Physiology (A.D., R.R., H.F.) and Laboratory of Genetics (M.V M.), University of Gent, B-9000 Gent, Belgium
Individual members of the Arabidopsis thaliana ribulose-1,5-bisphosphate
carboxylase/oxygenase small subunit (rbcS) gene family are differentially
regulated by light of different qualities. In 10-d-old etiolated seedlings,
the expression of only three of the four genes is under inductive
phytochrome control. rbcS mRNA levels reach a maximum (3- to 5-fold higher
than the dark level) about 6 h after a red light pulse, but the rate of
decay differs among the genes. Moreover, rbcS 2B requires a higher fluence
for induction. At early stages of development, rbcS 1A, 2B, and 3B are
highly expressed in the dark and cannot be further induced by red light,
indicating a developmental component in the overall regulatory mechanism.
Continuous light experiments indicate that high-irradiance responses may
play a role in the induction of at least three of the four rbcS genes.
Under conditions of phytochrome saturation, rbcS 1A is insensitive to blue
pulses, whereas among the three B locus genes, at least rbcS 3B appears to
respond to a blue-light photoreceptor. These results add to the data
suggesting that individual members of rbcS gene families in higher plants
may be subject to a variety of differing regulatory mechanisms.
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