Acts as positive regulator of adventitious (crown) root formation by promoting its initiation (PubMed:15829602, PubMed:15960615). Acts as positive regulator of lateral root formation. Regulated by the auxin response factor and transcriptional activator ARF23/ARF1 (PubMed:15829602). Involved in auxin-mediated cell dedifferentiation, and may promote the initial cell division in the pericycle cells adjacent to the peripheral vascular cylinder at the base of the stem (PubMed:15960615). May act upstream of the gene regulatory network controlling adventitious root (crown) development (PubMed:21806801). Can form homodimers. Expressed in unelongating basal internodes, at the base of shoot in parenchyma cells adjacent to the peripheral vascular cylinder of the stem, and root pericycle cells (PubMed:15829602). Expressed in lateral and adventitious root primordia, tiller primordia, vascular tissues, scutellum, and young pedicels (PubMed:15960615). Induced by auxin (PubMed:15829602, PubMed:15960615). Induced by ethylene (PubMed:15960615). Defective in adventitious (crown) root formation (PubMed:15829602, PubMed:15960615). Reduced lateral root formation (PubMed:15829602). Belongs to the LOB domain-containing protein family.