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PLANT PHYSIOLOGY , Vol 110, Issue 2 455-463, Copyright © 1996 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Sucrose Represses the Developmentally Controlled Transient Activation of the Plastocyanin Gene in Arabidopsis thaliana Seedlings
P. P. Dijkwel, PAM. Kock, R. Bezemer, P. J. Weisbeek and SCM. Smeekens
Department of Molecular Cell Biology, University of Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands
The plastocyanin (PC) gene of Arabidopsis thaliana is activated
independently of light during early seedling development. In etiolated
seedlings, PC mRNA levels increase transiently and a maximum dark level is
reached after 2 d of growth in darkness. In etiolated transgenic seedlings
carrying a chimeric PC-promoter: luciferase fusion gene, luciferase
activity is similarly increased after 2 d of growth. The transient increase
in PC mRNA and luciferase activity levels can be repressed by sucrose.
Nonmetabolizable sugars and polyethylene glycol do not have a major effect
on PC gene expression. Also, light-grown seedlings show a similar transient
and sucrose-sensitive increase in PC mRNA levels and luciferase activity,
as in dark-grown seedlings, but here expression levels are 15- fold higher.
These findings suggest the presence of a sucrose-sensitive, developmentally
controlled expression mechanism that operates independently of light.
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