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. 2021 Mar 5;12:621032. doi: 10.3389/fpls.2021.621032

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Copyright © 2021 Abarca.

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) and the copyright owner(s) 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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Proposed checkpoints for age-related decline in adventitious root induction. (A) Epigenetic control of miR160/167 could modulate auxin signaling. (B) TARGET OF RAPAMICINE (TOR) developmental regulation could affect sugar and auxin control of the G1-S transition. (C) CLAVATA3/EMBRYO SURROUNDING REGION-RELATED (CLE) peptides and their receptor-like kinases (RLKs) are involved in the control of apical and vascular meristem stem cell proliferation via non-cell autonomous signaling, and could regulate WOX11/12 expression in adventitious roots (AR) founder cells. 1, 2, and 3 refer to Figure 1. ARR5/6, Type A Arabidopsis Response Regulators 5/6, modulators of cytokinin signaling; BARELY ANY MERISTEM (BAM), CLAVATA1 (CLV1), and TDIF receptor (TDR) are RLKs.