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CELL BIOLOGY AND SIGNAL TRANSDUCTION

The GCR1, GPA1, PRN1, NF-Y Signal Chain Mediates Both Blue Light and Abscisic Acid Responses in Arabidopsis^1,[W],[OA]

Laboratory for Molecular Biology, Department of Biological Sciences (K.M.W., S.U., J.Y., J.A., S.I.H., M.A., L.S.K.), and Department of Biochemistry and Genetics (Y.R.L.), University of Illinois, Chicago, Illinois 60607

Different classes of biotic (e.g. plant hormones) and abiotic (e.g. different wavelengths of light) signals act through specific signal transduction mechanisms to coordinate higher plant development. While a great deal of progress has been made, full signal transduction chains have not yet been described for most blue light- or abscisic acid-mediated events. Based on data derived from T-DNA insertion mutants and yeast (Saccharomyces cerevisiae) two-hybrid and coprecipitation assays, we report a signal transduction chain shared by blue light and abscisic acid leading to light-harvesting chlorophyll a/b-binding protein expression in etiolated Arabidopsis (Arabidopsis thaliana) seedlings. The chain consists of GCR1 (the sole Arabidopsis protein coding for a potential G-protein-coupled receptor), GPA1 (the sole Arabidopsis G-subunit), Pirin1 (PRN1; one of four members of an iron-containing subgroup of the cupin superfamily), and a nuclear factor Y heterotrimer comprised of A5, B9, and possibly C9. We also demonstrate that this mechanism is present in imbibed seeds wherein it affects germination rate.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Lon S. Kaufman (lkaufman{at}uic.edu).

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www.plantphysiol.org/cgi/doi/10.1104/pp.106.089904

^* Corresponding author; e-mail lkaufman{at}uic.edu; fax 312–413–2691.

Received September 21, 2006; accepted January 31, 2007; published February 23, 2007.

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