Plant Physiology Preview
Published on February 23, 2007; 10.1104/pp.106.089904
OPEN ACCESS ARTICLE
Received September 21, 2006
Accepted January 31, 2007
The GCR1, GPA1, PRN1, NF-Y Signal Chain Mediates Both Blue Light and ABA Responses in Arabidopsis
Katherine M. Warpeha , Snehali Upadhyay , Jennifer Yeh , Julia Adamiak , Samuel I. Hawkins , Yevgeniya R. Lapik , Marybeth Anderson , and Lon S. Kaufman *
Laboratory for Molecular Biology, Department of Biological Sciences, University of Illinois at Chicago, Chicago, Illinois, 60607, U.S.A.; Department of Biochemistry and Genetics, University of Illinois at Chicago, Chicago, Illinois, 60607, U.S.A.
* Corresponding author; email: lkaufman{at}uic.edu.
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 two-hybrid and co-precipitation assays, we report a signal transduction chain, shared by blue light and ABA leading to Lhcb expression in etiolated Arabidopsis seedlings. The chain consists of GCR1 (the sole Arabidopsis protein coding for a potential G-protein coupled receptor), GPA1 (the sole Arabidopsis G subunit), PRN1 (Pirin1, one of four members of an iron-containing subgroup of the cupin superfamily), and an NF-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.
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