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PLANT PHYSIOLOGY , Vol 104, Issue 4 1251-1257, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Blue-Light Regulation of the Arabidopsis thaliana Cab1 Gene
J. Gao and L. S. Kaufman
Department of Biological Sciences, Laboratory for Molecular Biology, University of Illinois at Chicago, Chicago, Illinois 60680
The steady-state level of Cab RNA in etiolated Arabidopsis thaliana
increases as a result of a single pulse of blue light. The threshold for
the response is at or below 10[deg] [mu]mol m-2 and begins within 1 h of
irradiation. The response is not prevented by far-red treatment, and the
blue-light source used does not elicit and observable very low fluence
phytochrome response for RbcS RNA. The time course for blue-light-induced
transcript accumulation differs from that of red, the blue beginning more
quickly. Transcripts derived from the Cab1 (AB140; Lhcb1*3) member of the
gene family are responsible in part for the blue-light-induced
accumulation. This is the same member of the gene family that is
responsible for phytochrome-induced Cab gene expression (G.A.
Karlin-Neumann, L. Sun, E.M. Tobin [1988] Plant Physiol 88: 1323-1331). The
mutant hy4, which lacks blue-light-induced suppression of hypocotyl
elongation, retains the ability of Cab RNA to respond to blue light.
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