Among the most fascinated properties of the plant hormone auxin is its ability to promote formation of its own directional transport routes. These gradually narrowing auxin channels form from the auxin source toward the sink and involve coordinated, collective polarization of individual cells. Once established, the channels provide positional information, along which new vascular strands form, for example, during organogenesis, regeneration, or leave venation. The main prerequisite of this still mysterious auxin canalization mechanism is a feedback between auxin signaling and its directional transport. This is manifested by auxin-induced re-arrangements of polar, subcellular localization of PIN-FORMED (PIN) auxin exporters. Immanent open questions relate to how position of auxin source and sink as well as tissue context are sensed and translated into tissue polarization and how cells communicate to polarize coordinately. Recently, identification of the first molecular players opens new avenues into molecular studies of this intriguing example of self-organizing plant development.
Current Opinion in Plant Biology
The authors apologize to those researchers whose work was not cited. In addition, exciting topics such as PIN polarization in context of phyllotaxis, shoot branching and termination of gravitropic bending, or role of additional auxin transporters could not have been included owing to lack of space. This work was supported by the Czech Science Foundation GAČR (GA18-26981S). The authors also acknowledge the EMBO for supporting J.H. with a long-term fellowship (ALTF217-2021).
Hajny J, Tan S, Friml J. Auxin canalization: From speculative models toward molecular players. Current Opinion in Plant Biology. 2022;65(2). doi:10.1016/j.pbi.2022.102174
Hajny, J., Tan, S., & Friml, J. (2022). Auxin canalization: From speculative models toward molecular players. Current Opinion in Plant Biology. Elsevier. https://doi.org/10.1016/j.pbi.2022.102174
Hajny, Jakub, Shutang Tan, and Jiří Friml. “Auxin Canalization: From Speculative Models toward Molecular Players.” Current Opinion in Plant Biology. Elsevier, 2022. https://doi.org/10.1016/j.pbi.2022.102174.
J. Hajny, S. Tan, and J. Friml, “Auxin canalization: From speculative models toward molecular players,” Current Opinion in Plant Biology, vol. 65, no. 2. Elsevier, 2022.
Hajny J, Tan S, Friml J. 2022. Auxin canalization: From speculative models toward molecular players. Current Opinion in Plant Biology. 65(2), 102174.
Hajny, Jakub, et al. “Auxin Canalization: From Speculative Models toward Molecular Players.” Current Opinion in Plant Biology, vol. 65, no. 2, 102174, Elsevier, 2022, doi:10.1016/j.pbi.2022.102174.
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