Component of the anaphase promoting complex/cyclosome (APC/C), a cell cycle-regulated E3 ubiquitin ligase that controls progression through mitosis and the G1 phase of the cell cycle. The APC/C complex acts by mediating ubiquitination and subsequent degradation of target proteins (By similarity). Regulates global growth and development, including phyllotaxis and apical dominance (PubMed:17627280). Required for pollen maturation. Promotes (pri) miRNA transcription of each MIR159 genes (PubMed:21441434). Protein modification; protein ubiquitination. Component of the anaphase promoting complex/cyclosome (APC/C) complex. Expressed constitutively in roots, leaves, stems, buds, flowers, and seeds. Regulated by epigenetic histone methylation on H3K9me in a KYP and CMT3-dependent manner. Abnormalities in shoot and inflorescence development leading to the 'bonsai' phenotype characterized by short, compact inflorescence, resulting in reduced plant height, disrupted phyllotaxis, reduced apical dominance and production of clusters of bracts and flowers at the apex of the inflorescence (PubMed:17627280, PubMed:16117643, PubMed:9450349). Reduced seed set mostly due to impaired pollen maturation and thus abnormal male transmission. Defects in mature miRNA miR159 accumulation (PubMed:21441434). Belongs to the APC13 family.