REVEILLE1, a Myb-like transcription factor, integrates the circadian clock and auxin pathways.

The circadian clock modulates expression of a large fraction of the Arabidopsis genome and affects many aspects of plant growth and development. We have discovered one way in which the circadian system regulates hormone signaling, identifying a node that links the clock and auxin networks. Auxin plays key roles in development and responses to environmental cues, in part through regulation of plant growth.

The FLX gene of Arabidopsis is required for FRI-dependent activation of FLC expression.

The Arabidopsis FLOWERING LOCUS C (FLC) gene encodes a MADS box protein that acts as a dose-dependent repressor of flowering. Mutants and ecotypes with elevated expression of FLC are late flowering and vernalization responsive. In this study we describe an early flowering mutant in the C24 ecotype, flc expressor (flx), that has reduced expression of FLC.

Differential gene expression and subcellular targeting of Arabidopsis glutathione S-transferase F8 is achieved through alternative transcription start sites.

Glutathione S-transferases (GSTs) play major roles in the protection of plants from biotic and abiotic stresses through the detoxification of xenobiotics and toxic endogenous products. This report describes additional complexity in the regulation of the well characterized stress-responsive Arabidopsis thaliana GSTF8 promoter. This complexity results from the use of multiple transcription start sites (TSS) to give rise to alternate GSTF8 transcripts with the potential to produce two in-frame proteins differing only in their N-terminal sequence.

PsfR, a factor that stimulates psbAI expression in the cyanobacterium Synechococcus elongatus PCC 7942.

In this paper a gene (psfR) is reported that regulates psbAI activity in Synechococcus elongatus, a unicellular photoautotrophic cyanobacterium that carries out oxygenic (plant-type) photosynthesis and exhibits global circadian regulation of gene expression. In S. elongatus, a family of three psbA genes encodes the D1 protein of the photosystem II reaction centre.

HY5, Circadian Clock-Associated 1, and a cis-element, DET1 dark response element, mediate DET1 regulation of chlorophyll a/b-binding protein 2 expression.

DET1 is a pleiotropic regulator of Arabidopsis development and controls the expression of many light-regulated genes. To gain a better understanding of the mechanism by which DET1 controls transcription from light-regulated promoters, we identified elements in the chlorophyll a/b-binding protein 2 (CAB2) promoter that are required for DET1-mediated expression. Using a series of reporter constructs in which the luciferase gene is controlled by CAB2 promoter fragments, we defined two DET1-responsive elements in the CAB2 promoter that are essential for proper CAB2 transcription.