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. 2021 Mar 9;12:633293. doi: 10.3389/fpls.2021.633293

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Copyright © 2021 Yang, You, Yang, Zhang, Yang, Li, Chen, Luo and Hu.

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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Diagrammatic representation of the structure of the tip region of a pollen tube (PT). The tip of a PT can be classically divided into four zones from the tip to the base: clear zone, subapical growth area, nuclear area, and vacuolar area. The bulk of exocytosis occurs in the apical region as shown with the solid red arrows, while certain exocytic vesicles may also be secreted to the subapical growth area, as shown with the dotted arrows. Endocytosis can occur in the apical and subapical growth areas and nuclear area as shown with the blue arrows (ER is endoplasmic reticulum).