Negative regulator of flowering controlling the H4K5 acetylation levels in the FLC and FT chromatin. Positively regulates FLC expression. Component of the transcription factor IID (TFIID) complex that is essential for mediating regulation of RNA polymerase transcription. Component of the SWR1 complex which mediates the ATP-dependent exchange of histone H2A for the H2A variant HZT1 leading to transcriptional regulation of selected genes by chromatin remodeling. Component of a NuA4 histone acetyltransferase complex which is involved in transcriptional activation of selected genes principally by acetylation of nucleosomal histones H4 and H2A. Component of the TFIID complex. TFIID is composed of TATA binding protein (TBP) and a number of TBP-associated factors (TAFs) whose MWs range from 14-217 kDa. Interacts with TAF1, TAF4B and TAF12B. Component of the SWR1 chromatin-remodeling complex. Interacts with FLX, a component of the transcription activator complex FRI-C (PubMed:17340043, PubMed:21282526). Interacts with SWC4, and with EAF1A and EAF1B (via HSA domain) (Ref.9). Expressed in roots, leaves, inflorescence and flowering tissues. No visible phenotype, due to the redundancy with TAF14. Modest early flowering. Taf14 and taf14b double mutants show a pleiotropic phenotype that includes small size and abnormal leaf morphology (PubMed:21282526, PubMed:23017898). Taf14 and taf14b double mutants show a reduced H4K5 acetylation in the promoter region of major flowering regulator genes including FLC, CO and SOC1, and a more pronounced early flowering (Ref.9). Belongs to the YAF9 family.