Probable transcription factor involved in the negative regulation of flowering time in both long and short days, probably through the photoperiodic and vernalization pathways. Prevents premature flowering. Interacts with AGL39, AGL97 and AGL74. Expressed in most plant tissues, embryo, seedlings, roots, leaves, stems, inflorescence, pollen, siliques and flowers. Slightly repressed by vernalization. Negatively regulated at the chromatin level by VIL1 through the photoperiod and vernalization pathways. Requires EARLY FLOWERING 7 (ELF7) and ELF8 to be expressed. Up-regulated by HUA2. Suppress the late-flowering phenotype of photoperiod-pathway mutants. Affects natural variation in flowering behavior in both long and short days. The early flowering of cv. Nd-1 (especially in short days) is due to a deletion of AGL27. This deletion is associated with the QTL 'FLOWERING 1' (FLW1) (PubMed:15695584).