Repressor of strigolactones (SL) signaling (PubMed:24336200, PubMed:24336215). Subjected to a negative feedback control of SL signaling (PubMed:24336200, PubMed:24336215). Suppresses the transcriptional activation activity of SPL14/IPA1 in SL signaling (PubMed:28809396). Acts with SPL14/IPA1 to mediate the SL-regulated tiller development (PubMed:28809396). Subject to a negative feedback regulation by SPL14/IPA1, which binds to D53 promoter to repress D53 gene expression (PubMed:28809396). Interacts with D3 (PubMed:24336200). Interacts with D14 (PubMed:24336200, PubMed:25713176). The interaction with D14 is enhanced in the presence of strigolactones (PubMed:24336200). The interaction with D14 occurs in the presence of (2'R) stereoisomers of strigolactones, but not (2'S) stereoisomers (PubMed:25713176). Interacts with the TOPLESS-related proteins TPR1, TPR2 and TPR3 (PubMed:24336200). Interacts with SPL14/IPA1 (PubMed:28809396). Expressed in the shoot bases of seedlings, young leaves, axillary buds and young panicles (PubMed:24336200, PubMed:24336215). Expressed in young roots vasculature, culms, internodes and nodes, preferentially in the parenchyma cells surrounding the xylem (PubMed:24336215). Up-regulated by strigolactone treatment. Contains 3 EAR motifs associated with active repression of several target genes (PubMed:24336200, PubMed:24336215). The D1 domain (195-440) is essential for the strigolactone-dependent D53-D14 interaction (PubMed:24336215). Polyubiquitinated. Strigolactone, but not karrikin, triggers rapid SCF(D3)-dependent degradation via the proteasome. Belongs to the ClpA/ClpB family.