Probable transcription factor. May play redundant roles with GEBP and GPL2 in cytokinin responses by regulating the transcript levels of type-A ARR response genes (PubMed:18162594). Involved in stress responses (PubMed:21875893). Plays a repressive role in cell expansion by counteracting the positive role of CPR5 in this process, but does not regulate cell proliferation or endoreduplication (PubMed:21875893). Homo- and heterodimers. Interacts with GEBP, GPL2 and GPL3. Interacts with GEBP (PubMed:29192025). Expressed in the apical meristem and young leaf primordia. Detected in the vascular tissues of cotyledons and leaves, in hydathodes and at the base of flowers and siliques, but not in roots. Belongs to the GeBP family.