Plant Physiology Preview
Published on November 6, 2003; 10.1104/pp.103.030007
Received July 9, 2003
Returned for revision August 4, 2003
Accepted September 10, 2003
EARLY FLOWERING 4 Functions in Phytochrome B-Regulated Seedling De-Etiolation
Rajnish Khanna , Elise A. Kikis , and Peter H. Quail *
Department of Plant and Microbial Biology, University of California, Berkeley, California 94720; and United States Department of Agriculture/Agricultural Research Service-Plant Gene Expression Center, 800 Buchanan Street, Albany, California 94710
* Corresponding author; email: quail{at}nature.berkeley.edu.
To define the functions of genes previously identified by expression profiling as being rapidly light induced under phytochrome (phy) control, we are investigating the seedling de-etiolation phenotypes of mutants carrying T-DNA insertional disruptions at these loci. Mutants at one such locus displayed reduced responsiveness to continuous red, but not continuous far-red light, suggesting a role in phyB signaling but not phyA signaling. Consistent with such a role, expression of this gene is induced by continuous red light in wild-type seedlings, but the level of induction is strongly reduced in phyB-null mutants. The locus encodes a novel protein that we show localizes to the nucleus, thus suggesting a function in light-regulated gene expression. Recently, this locus was identified as EARLY FLOWERING 4, a gene implicated in floral induction and regulating the expression of the gene CIRCADIAN CLOCK-ASSOCIATED 1. Together with these previous data, our findings suggest that EARLY FLOWERING 4 functions as a signaling intermediate in phy-regulated gene expression involved in promotion of seedling de-etiolation, circadian clock function, and photoperiod perception.
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