Involved in strigolactone (SL) signaling (PubMed:23025475, PubMed:24336215, PubMed:24616269). Required for responses to SLs and the establishment of arbuscular mycorrhiza symbiosis in rice (PubMed:23025475). Strigolactone-dependent association of D3 with D14 and D53 (a repressor of SL signaling) triggers D53 ubiquitination and degradation (PubMed:24616269). Controls tillering by suppressing axillary bud activity (PubMed:15659436). Tiller is a specialized grain-bearing branch that is formed on the unelongated basal internode and grows independently of the mother stem (culm) by means of its own adventitious roots (PubMed:15659436). Associates to a SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex (Probable). Interacts with D14 in a strigolactone-dependent manner (PubMed:24336200, PubMed:24336215, PubMed:24616269). Interacts with SKP1, SKP5 and SKP20 (PubMed:24616269). Expressed in leaves (PubMed:15659436). Expressed in roots, culms, leaf blades, leaf sheaths, shoot bases and panicles (PubMed:24616269). Increased number of tillers and reduced plant height.