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Mechanical modelling quantifies the functional importance of outer tissue layers during root elongation and bending

Dyson, Rosemary J.; Vizcay-Barrena, Gema; Band, Leah R.; Fernandes, Anwesha N.; French, Andrew P.; Fozard, John A.; Hodgman, T. Charlie; Kenobi, Kim; Pridmore, Tony P.; Stout, Michael; Wells, Darren M.; Wilson, Michael H.; Bennett, Malcolm J.; Jensen, Oliver E.

Authors

Rosemary J. Dyson

Gema Vizcay-Barrena

LEAH BAND leah.band@nottingham.ac.uk
Associate Professor

Anwesha N. Fernandes

John A. Fozard

T. Charlie Hodgman

Kim Kenobi

TONY PRIDMORE tony.pridmore@nottingham.ac.uk
Professor of Computer Science

Michael Stout michael.stout@nottingham.ac.uk

DARREN WELLS DARREN.WELLS@NOTTINGHAM.AC.UK
Principal Research Fellow

Michael H. Wilson

Oliver E. Jensen



Abstract

Root elongation and bending require the coordinated expansion of multiple cells of different types. These processes are regulated by the action of hormones that can target distinct cell layers. We use a mathematical model to characterise the influence of the biomechanical properties of individual cell walls on the properties of the whole tissue.

Taking a simple constitutive model at the cell scale which characterises cell walls via yield and extensibility parameters, we derive the analogous tissue-level model to describe elongation and bending. To accurately parameterise the model, we take detailed measurements of cell turgor, cell geometries and wall thicknesses.

The model demonstrates how cell properties and shapes contribute to tissue-level extensibility and yield. Exploiting the highly organised structure of the elongation zone (EZ) of the Arabidopsis root, we quantify the contributions of different cell layers, using the measured parameters. We show how distributions of material and geometric properties across the root cross-section contribute to the generation of curvature, and relate the angle of a gravitropic bend to the magnitude and duration of asymmetric wall softening.

We quantify the geometric factors which lead to the predominant contribution of the outer cell files in driving root elongation and bending.

Citation

Dyson, R. J., Vizcay-Barrena, G., Band, L. R., Fernandes, A. N., French, A. P., Fozard, J. A., …Jensen, O. E. (2014). Mechanical modelling quantifies the functional importance of outer tissue layers during root elongation and bending. New Phytologist, 202(4), 1212-1222. https://doi.org/10.1111/nph.12764

Journal Article Type Article
Acceptance Date Feb 2, 2014
Online Publication Date Mar 18, 2014
Publication Date Jan 1, 2014
Deposit Date Jun 29, 2017
Publicly Available Date Jun 29, 2017
Journal New Phytologist
Print ISSN 0028-646X
Electronic ISSN 1469-8137
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 202
Issue 4
Pages 1212-1222
DOI https://doi.org/10.1111/nph.12764
Keywords Arabidopsis thaliana, Elongation, Extensibility, Gravitropism, Mechanical modelling, Multiscale
Public URL http://eprints.nottingham.ac.uk/id/eprint/43869
Publisher URL https://doi.org/10.1111/nph.12764
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
Additional Information Published Online: 2014-03-18

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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