Transcription factor required for the transition to flowering promoted by FT. Self-interacts (PubMed:16099979). Interacts with FT and FD/BZIP14 (PubMed:16099979, PubMed:16099980). Interacts with CPK33 (PubMed:25661797). Expressed on the flanks of the shoot apex. Phosphorylated (Probable). Slightly delayed flowering. In the plants missing both FD and FDP, fd-2 fdp-1 strongly delayed flowering, even in the presence of high FT levels. Belongs to the bZIP family. Truncated N-terminus. Truncated N-terminus.