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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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Hormone function in the proliferation domain. (A) Hormones accumulation in the MZ. The auxin gradient (green) is established by the transport network formed by PIN efflux proteins and GA (blue) produced in the PD moves upwards this zone. GA is synthesized mainly in cortex and endodermis cells and CK (light orange) in vascular tissue. (B) Structure of the PD: the stem cell niche (SCN red) at the base produces cells that are incorporated to the PD where they proliferate at a high rate in either the epidermis (Ep), cortex (Cor), endodermis (En) and stele (St). At the right of the Figure is depicted the hormonal regulation (black arrows) and crosstalk (dotted arrows) over the MZ growth.