The GCR1, GPA1, PRN1, NF-Y signal chain mediates both blue light and abscisic acid responses in Arabidopsis.
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 Galpha-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.
Warpeha
Katherine M
KM
Laboratory for Molecular Biology, Department of Biological Sciences , University of Illinois, Chicago, Illinois 60607, USA.
Upadhyay
Snehali
S
Yeh
Jennifer
J
Adamiak
Julia
J
Hawkins
Samuel I
SI
Lapik
Yevgeniya R
YR
Anderson
Mary Beth
MB
Kaufman
Lon S
LS
D000040:Abscisic Acid / Q000378:metabolism*; D017360:Arabidopsis / Q000196:embryology / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism*; D018525:Germination; D008027:Light; D012639:Seeds / Q000254:growth & development; D015398:Signal Transduction; D020798:Two-Hybrid System Techniques
D029681:Arabidopsis Proteins; D000040:Abscisic Acid