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. 2016 Jan 20;6:1224. doi: 10.3389/fpls.2015.01224

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Copyright © 2016 Neumann.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Stages of CR development in P_i-deficient white lupin (Lupinus albus L.). Characteristic processes in the different root zones potentially modulated by ethylene are marked in green. (A) Single second order lateral rootlet of a MA root cluster, densely covered with root hairs. (B) Single lateral rootlet of an outgrowing juvenileJU root cluster with growing root hairs. (C) Outgrowth of a lateral rootlet primordium. (D) Root clusters in different developmental stages along a first-order lateral root; (E) Root system of P_i-deficient white lupin with CRs development. PE, pre-emergent stage; JU, juvenile cluster; MA, mature cluster. (Figure modified after Wang et al., 2014b).