EARLY FLOWERING 4 functions in phytochrome B-regulated seedling de-etiolation.

Abstract:

: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.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Khanna R,Kikis EA,Quail PH

doi

10.1104/pp.103.030007

subject

Has Abstract

pub_date

2003-12-01 00:00:00

pages

1530-8

issue

4

eissn

0032-0889

issn

1532-2548

pii

pp.103.030007

journal_volume

133

pub_type

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