part_of part of part of root tip plant axis elongation zone root elongation zone 2010-12-03T08:54:52Z A plant axis elongation zone (PO:0025180) that is part of a root tip (PO:0000025) and located proximal to a root apical meristem (PO:0020147). PO:0025181 PO_GIT:197 The root elongation zone is only a few millimeters in length and is the only portion of the root in which cell elongation generally occurs. Root hairs are not yet produced in this region. Primary root tissues begin to differentiate in the root elongation zone. This term replaces elongation zone (PO:0020125). plant_anatomy rwalls zona de elongaci&#243n de la ra&#237z (Spanish, exact) 根伸長帯（層） (Japanese, exact)