Both phyA and phyB mediate light-imposed repression of PHYA gene expression in Arabidopsis.

The negatively photoregulated PHYA gene has a complex promoter structure in Arabidopsis, with three active transcription start sites. To identify the photoreceptors responsible for regulation of this gene, and to assess the relative roles of the three transcription start sites, we analyzed the changes in PHYA transcript levels in wild-type and photoreceptor… CONTINUE READING