Transcription factor which may be involved in the signal transduction pathway downstream of the COP1 gene. Controls floral competency as a specific activator of FLC expression. Is responsive of the nuclear import of SHOOT MERISTEMLESS (STM). May form heterodimeric complex with the TALE/KNOX protein STM. Most abundant in flowers. Down-regulated in the shoot apical meristem (SAM) upon floral induction. By light. In etiolated seedlings, maximally expressed after 3 days of illumination. The SR/KY and BELL domains are responsive for the interaction between the TALE/BELL proteins and the TALE/KNOX proteins. Belongs to the TALE/BELL homeobox family.