develops from root primordium root primordia (exact, plural) A primordium (PO:0025127) that develops from a root anlagen (PO:0025433) and is committed to the development of a root (PO:0009005). 根原基（可視的） (Japanese, exact) PO:0005029 PO_GIT:467 portion of root primordium tissue (exact) primordio de ra&#237z (Spanish, exact) A root primordium may arise from cells of a pericycle (PO:0006203) in a root in most seed plant (pericyclic lateral root primordium; PO:0025492), from cells of an endodermis (PO:0000252) in ferns and some seed plants (non-pericyclic lateral root primordium: PO:0025493), or from cells of a shoot axis (PO:0025029), in the case of a basal root primordium (PO:0025479) or shoot-borne root primordium (PO:0025480). Transition from root primordium to root occurs with the formation of a root cap (PO:0020123), shortly after the development of a root apical meristem (PO:0020147). plant_anatomy primordium root anlagen anatomical entity