Probable transcription factor (By similarity). Together with APO1, involved in the temporal regulation of meristem size and identity during both vegetative and reproductive developments through interaction with APO1 (PubMed:21910771). Promotes flowering (PubMed:21910771). Interacts with APO1. In very young panicle but not in mature florets, mature leaves, roots or apical meristems. In the vegetative phase, expressed in shoot meristems and leaf primordia. In the reproductive phase, present in the meristems of primary and secondary branches at primordial and elongating stages, but later transiently down-regulated from the meristems, when the meristem identity change from inflorescence to spikelet. Subsequent expression recovery when spikelets are differentiated, with an accumulation in floral meristems and in primordia of all floral organs, including lodicules, stamens, carpels and ovules. Several abnormal phenotypes in the vegetative and reproductive phases including short plastochron, late flowering, small panicles, reduced meristems size, aberrant floral organ identities and loss of floral meristem determinacy (PubMed:21910771). Reduced panicles size is associated with reduced number of primary branches due to the precocious formation of spikelet meristems (PubMed:21910771). Belongs to the FLO/LFY family.