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Published on March 10, 2006; 10.1104/pp.106.079145

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Received February 13, 2006
Returned for revision February 28, 2006
Accepted February 28, 2006

Diurnal regulation of the brassinosteroid-biosynthetic CPD gene in Arabidopsis

Simona Bancos , Anna-Mária Szatmári , Julie Castle , László Kozma-Bognár , Kyomi Shibata , Takao Yokota , Gerard J. Bishop , Ferenc Nagy , and Miklós Szekeres *

Institute of Plant Biology, Biological research Center of the Hungarian Academy of Sciences, P. O. Box 521, H-6701 Szeged, Hungary
Institute of Biological Sciences, The University of Wales, Aberystwyth SY23 3DD, United Kingdom
Department of Biosciences, Teikyo University, Utsunomiya 320-8551, Japan
Institute of Biological Sciences, The University of Wales, Aberystwyth SY23 3DD, United Kingdom; Division of Biology, Imperial College London, Wye Campus, Wye TN25 5AH, United Kingdom

* Corresponding author; email: szekeres{at}nucleus.szbk.u-szeged.hu.

Plant steroid hormones, brassinosteroids, are essential for normal photomorphogenesis. However, the mechanism by which light controls physiological functions via brassinosteroids is not well understood. Using transgenic plants carrying promoter-luciferase reporter gene fusions we show that in Arabidopsis thaliana the brassinosteroid-biosynthetic CPD and CYP85A2 genes are under diurnal regulation. The complex diurnal expression profile of CPD is determined by dual, light-dependent and circadian control. The severely decreased expression level of CPD in phytochrome-deficient background and the red light-specific induction in wild-type plants suggest that light regulation of CPD is primarily mediated by phytochrome signaling. The diurnal rhythmicity of CPD expression is maintained in bri1 transgenic seedlings, indicating that its transcriptional control is independent of hormonal feedback regulation. Diurnal changes in the expression of CPD and CYP85A2 are accompanied by changes of the endogenous brassinosteroid content during the day, leading to brassinolide accumulation at the middle of the light phase. We also show that CPD expression is repressed in extended darkness in a brassinosteroid feedback-dependent manner. In the dark the level of the bioactive hormone did not increase, therefore our data strongly suggest that light also influences the sensitivity of plants to brassinosteroids.




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[Abstract] [Full Text] [PDF]


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