Component of the NF-Y/HAP transcription factor complex. The NF-Y complex stimulates the transcription of various genes by recognizing and binding to a CCAAT motif in promoters. Plays a role in the regulation of the embryogenesis. Involved in the abscisic acid (ABA) signaling pathway. Heterotrimeric transcription factor composed of three components, NF-YA, NF-YB and NF-YC (PubMed:27871811). NF-YB and NF-YC must interact and dimerize for NF-YA association and DNA binding (PubMed:27871811). Interacts with PRN1 (PubMed:17322342). Binds directly with DPB3-1 (PubMed:25490919). Expressed in roots, flowers and developing siliques. Present in etiolated seedlings. Expressed primarily during seed development. Enhanced by dehydration stress. Altered response to abscisic acid (ABA). Belongs to the NFYB/HAP3 subunit family.