Rosemary J. Dyson
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.
Leah R. Band
Anwesha N. Fernandes
Andrew P. French email@example.com
John A. Fozard
T. Charlie Hodgman
Tony P. Pridmore firstname.lastname@example.org
Michael Stout email@example.com
Darren M. Wells
Michael H. Wilson
MALCOLM BENNETT firstname.lastname@example.org
Professor of Plant Science
Oliver E. Jensen
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.
|Journal Article Type||Article|
|Peer Reviewed||Peer Reviewed|
|APA6 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|
|Keywords||Arabidopsis thaliana, Elongation, Extensibility, Gravitropism, Mechanical modelling, Multiscale|
|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|
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
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