Involved in the regulation of vernalization (By similarity). Binds to DNA in vitro in a non-sequence-specific manner. XLG2 promotes the DNA binding activity of RTV1 specifically to promoter regions of FT and SOC1 in vivo and thus leads to the activation of floral integrator genes. Interacts with XLG2 (PubMed:22232549). Interacts with ITN1 (PubMed:22664102). Ubiquitous. By cold.