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. 2021 Apr 26;12:659155. doi: 10.3389/fpls.2021.659155

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Copyright © 2021 Zluhan-Martínez, López-Ruíz, García-Gómez, García-Ponce, de la Paz Sánchez, Álvarez-Buylla and Garay-Arroyo.

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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Arabidopsis primary root developmental zones and domains. The root is composed from its tip along the longitudinal axis by the stem cell niche (SCN-red) that consists of stem cells that surround the Quiescent Center. The primary root is divided in three developmental zones: the meristematic zone (MZ), that includes the SCN, the proliferation domain (PD-yellow) and the transition domain (TD-orange); the elongation zone (EZ-green) and the differentiation zone (DZ-purple). The root cap (blue) surrounds the tip of the root until the end of the MZ. The approximate distance from the QC to the end of the PD, TD and EZ at 5 days after germination (5dag) WT seedlings is indicated below (Verbelen et al., 2006). The cellular functions that occur in each of the developmental zones and domains of the root are highlighted with the color that corresponds to each developmental stage.