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Plant Physiol, October 2001, Vol. 127, pp. 450-458

Control of Specific Gene Expression by Gibberellin and Brassinosteroid1

Thomas Bouquin, Carsten Meier, Randy Foster, Mads Eggert Nielsen, and John Mundy*

Department of Plant Physiology, Molecular Biology Institute, Copenhagen University, Øster Farimagsgade 2A, 1353 Copenhagen K, Denmark

We identified a recessive, brassinolide-insensitive mutant caused by a deletion allele (bri1-201) of the brassinosteroid (BR) receptor BRI1. The bri1-201 mutant displayed altered expression levels of genes differentially regulated by gibberellin (GA). RNA-blot analysis revealed that BR and GA antagonistically regulate the accumulation of mRNAs of the GA-responsive GASA1 gene, as well as the GA-repressible GA5 gene. Expression studies with cycloheximide indicated that the antagonistic effects of GA and BR on GA5 require de novo protein synthesis. Reporter transgene analyses and RNA-blot analysis showed that BR and GA modulate GA5 expression, at least in part, at the transcriptional level, and that the signals are independent and subtractive.

1 This research was funded by the European Union (grant nos. CT96-0062 and CT96-0621 to J.M.) and by a Danish research grant (no. 93524444A98000040 to R.F.). T.B. was funded by a postdoctoral Marie Curie Research training grant.

* Corresponding author; e-mail mundy{at}biobase.dk; fax 45-35322128.

© 2001 American Society of Plant Physiologists


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