Transcription factor involved the regulation of plant development. Together with TCP15, modulates plant stature by promoting cell division in young internodes. Represses cell proliferation in leaf and floral tissues (PubMed:21668538). Together with TCP15, acts downstream of gibberellin (GA), and the stratification pathways that promote seed germination. Involved in the control of cell proliferation at the root apical meristem (RAM) by regulating the activity of CYCB1-1 (PubMed:25655823). Involved in the regulation of seed germination. May regulate the activation of embryonic growth potential during seed germination (PubMed:17953649, PubMed:22155632). Acts together with SPY to promote cytokinin responses that affect leaf shape and trichome development in flowers (PubMed:22267487). Transcription factor involved in the regulation of endoreduplication. Represses endoreduplication by activating the gene expression of the key cell-cycle regulators RBR1 and CYCA2-3 (PubMed:25757472). Regulates the expression of the defense gene pathogenesis-related protein 2 (PR2) in antagonism to SRFR1, a negative regulator of effector-triggered immunity (PubMed:24689742). Involved in positive regulation of plant defense. Represses jasmonate (JA) response to promote disease resistance. Regulates the plant immune system by transcriptionally repressing a subset of JA-responsive genes (PubMed:28132837). Interacts with DOF3.2 (PubMed:22155632). Interacts with SPY (PubMed:22267487). Interacts with SRFR1 (PubMed:24689742). Interacts with GAI and RGL2 (PubMed:25655823). Interacts with DA1, DAR1 and DAR2 (PubMed:25757472). Interacts with the Pseudomonas syringae type III effector HopBB1 (PubMed:28132837). Interacts with SCE1 (PubMed:29250092). Interacts with MOS1 (PubMed:29086441). Localizes in sub-nuclear foci. Expressed in the vascular tissues of the embryo (PubMed:17953649). Expressed in young proliferating tissues (PubMed:21668538). Induced during seed imbibition (PubMed:17953649). Circadian-regulation with the lowest expression in the middle of the dark period (PubMed:17953649). Ubiquitinated (Probable). Targeted for degradation by the SCF(COI1) E3 ubiquitin ligase-proteasome pathway during jasmonate signaling in response to Pseudomonas syringae infection and the secreted type III effector HopBB1 (PubMed:28132837). Delayed germination (PubMed:17953649). No visible phenotype under normal growth conditions, but the double mutant plants tcp14 and tcp15 exhibit reduction in inflorescence height and pedicel length (PubMed:21668538). Plants overexpressing TCP14 exhibit altered plant development and occasionally are lethal (PubMed:22267487). Plants overexpressing TCP14 are modestly reduced in size and exhibit enhanced resistance to the bacterial pathogen Pseudomonas syringae pv tomato strain DC3000, and the oomycete Hyaloperonospora arabidopsidis (PubMed:28132837). Truncated N-terminus.