Plants develop new organs to adjust their bodies to dynamic changes in the environment. How independent organs achieve anisotropic shapes and polarities is poorly understood. To address this question, we constructed a mechano-biochemical model for Arabidopsis root meristem growth that integrates biologically plausible principles. Computer model simulations demonstrate how differential growth of neighboring tissues results in the initial symmetry-breaking leading to anisotropic root growth. Furthermore, the root growth feeds back on a polar transport network of the growth regulator auxin. Model, predictions are in close agreement with in vivo patterns of anisotropic growth, auxin distribution, and cell polarity, as well as several root phenotypes caused by chemical, mechanical, or genetic perturbations. Our study demonstrates that the combination of tissue mechanics and polar auxin transport organizes anisotropic root growth and cell polarities during organ outgrowth. Therefore, a mobile auxin signal transported through immobile cells drives polarity and growth mechanics to coordinate complex organ development.
e are grateful Richard Smith, Anne-Lise Routier, Crisanto Gutierrez and Juergen Kleine-Vehn for providing critical comments on the manuscript. Funding: This work was supported by the Programa de Atraccion de Talento 2017 (Comunidad de Madrid, 2017-T1/BIO-5654 to KW), Severo Ochoa (SO) Programme for Centres of Excellence in R&D from the Agencia Estatal de Investigacion of Spain (grant SEV-2016–0672 (2017–2021) to KW via the CBGP). In the frame of SEV-2016–0672 funding MM is supported with a postdoctoral contract. KW was supported by Programa Estatal de Generacion del Conocimiento y Fortalecimiento Cientıfico y Tecnologico del Sistema de I + D + I 2019 (PGC2018-093387-A-I00) from MICIU (to KW). MG is recipient of an IST Interdisciplinary Project (IC1022IPC03).
Marconi M, Gallemi M, Benková E, Wabnik K. A coupled mechano-biochemical model for cell polarity guided anisotropic root growth. eLife. 2021;10. doi:10.7554/elife.72132
Marconi, M., Gallemi, M., Benková, E., & Wabnik, K. (2021). A coupled mechano-biochemical model for cell polarity guided anisotropic root growth. ELife. eLife Sciences Publications. https://doi.org/10.7554/elife.72132
Marconi, Marco, Marçal Gallemi, Eva Benková, and Krzysztof Wabnik. “A Coupled Mechano-Biochemical Model for Cell Polarity Guided Anisotropic Root Growth.” ELife. eLife Sciences Publications, 2021. https://doi.org/10.7554/elife.72132.
M. Marconi, M. Gallemi, E. Benková, and K. Wabnik, “A coupled mechano-biochemical model for cell polarity guided anisotropic root growth,” eLife, vol. 10. eLife Sciences Publications, 2021.
Marconi M, Gallemi M, Benková E, Wabnik K. 2021. A coupled mechano-biochemical model for cell polarity guided anisotropic root growth. eLife. 10, 72132.
Marconi, Marco, et al. “A Coupled Mechano-Biochemical Model for Cell Polarity Guided Anisotropic Root Growth.” ELife, vol. 10, 72132, eLife Sciences Publications, 2021, doi:10.7554/elife.72132.
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