Effect of root age on the biomechanics of seminal and nodal roots of barley (Hordeum vulgare L.) in contrasting soil environments

K. W. Loades, A. G. Bengough, M. F. Bransby, P. D. Hallett

Research output: Contribution to journalArticle

12 Citations (Scopus)
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Abstract

Background and aims
The biomechanics of root systems influence plant lodging resistance and soil structural stabilisation. Tissue age has the potential to influence root biomechanical properties through changes in cell wall chemistry, root anatomy and morphology. Within a root system the internal structures of roots are known to vary markedly within different root types. Nodal, seminal and lateral roots of Barley (Hordeum vulgare) have differing biomechanical behaviour in tension. This study examines the effects of root age on biomechanical properties of barley root types (Hordeum vulgare) under abiotic stress.
Methods
Root age was determined as a function of the distance from root tip with abiotic stresses consisting of waterlogging and restriction to root elongation rate through increased soil bulk density. Linear regression analyses were performed on log-transformed tensile strength and Young’s modulus data with best fits determined for single and multiple parameter models to root morphological properties.
Results
Regression co-efficients and Akaike values showed that distance from root tip (taken as a proxy of root age) was the best single variable for prediction of both root tensile strength and Young’s modulus. Incorporation of both distance from root tip and root diameter and root type increased the reliability of predictions for root biomechanical properties from 47 to 57 % for tensile strength and 35 to 62 % for Young’s modulus.
Conclusions
The age effect may partly explain some scatter in both Young’s modulus and tensile strength to diameter relationship, commonly cited in the literature.
Original languageEnglish
Pages (from-to)253-261
Number of pages9
JournalPlant and Soil
Volume395
Issue number1
Early online date20 Jun 2015
DOIs
Publication statusPublished - Oct 2015

Fingerprint

biomechanics
edaphic factors
barley
Hordeum vulgare
soil
tensile strength
modulus of elasticity
Young modulus
root tips
effect
abiotic stress
root systems
root system
lodging resistance
prediction
flooded conditions
waterlogging

Keywords

  • root biomechanics
  • root age
  • abiotic stress
  • soil
  • cereal
  • modelling

Cite this

Effect of root age on the biomechanics of seminal and nodal roots of barley (Hordeum vulgare L.) in contrasting soil environments. / Loades, K. W.; Bengough, A. G.; Bransby, M. F.; Hallett, P. D.

In: Plant and Soil, Vol. 395, No. 1, 10.2015, p. 253-261.

Research output: Contribution to journalArticle

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title = "Effect of root age on the biomechanics of seminal and nodal roots of barley (Hordeum vulgare L.) in contrasting soil environments",
abstract = "Background and aimsThe biomechanics of root systems influence plant lodging resistance and soil structural stabilisation. Tissue age has the potential to influence root biomechanical properties through changes in cell wall chemistry, root anatomy and morphology. Within a root system the internal structures of roots are known to vary markedly within different root types. Nodal, seminal and lateral roots of Barley (Hordeum vulgare) have differing biomechanical behaviour in tension. This study examines the effects of root age on biomechanical properties of barley root types (Hordeum vulgare) under abiotic stress.MethodsRoot age was determined as a function of the distance from root tip with abiotic stresses consisting of waterlogging and restriction to root elongation rate through increased soil bulk density. Linear regression analyses were performed on log-transformed tensile strength and Young’s modulus data with best fits determined for single and multiple parameter models to root morphological properties.ResultsRegression co-efficients and Akaike values showed that distance from root tip (taken as a proxy of root age) was the best single variable for prediction of both root tensile strength and Young’s modulus. Incorporation of both distance from root tip and root diameter and root type increased the reliability of predictions for root biomechanical properties from 47 to 57 {\%} for tensile strength and 35 to 62 {\%} for Young’s modulus.ConclusionsThe age effect may partly explain some scatter in both Young’s modulus and tensile strength to diameter relationship, commonly cited in the literature.",
keywords = "root biomechanics, root age, abiotic stress, soil, cereal , modelling",
author = "Loades, {K. W.} and Bengough, {A. G.} and Bransby, {M. F.} and Hallett, {P. D.}",
note = "Acknowledgments The James Hutton Institute receives funding from the Scottish Government. The authors would also like to thank Jim McNicol from Biomathematics and Statistics Scotland for his advice on statistical analysis.",
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AU - Bransby, M. F.

AU - Hallett, P. D.

N1 - Acknowledgments The James Hutton Institute receives funding from the Scottish Government. The authors would also like to thank Jim McNicol from Biomathematics and Statistics Scotland for his advice on statistical analysis.

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N2 - Background and aimsThe biomechanics of root systems influence plant lodging resistance and soil structural stabilisation. Tissue age has the potential to influence root biomechanical properties through changes in cell wall chemistry, root anatomy and morphology. Within a root system the internal structures of roots are known to vary markedly within different root types. Nodal, seminal and lateral roots of Barley (Hordeum vulgare) have differing biomechanical behaviour in tension. This study examines the effects of root age on biomechanical properties of barley root types (Hordeum vulgare) under abiotic stress.MethodsRoot age was determined as a function of the distance from root tip with abiotic stresses consisting of waterlogging and restriction to root elongation rate through increased soil bulk density. Linear regression analyses were performed on log-transformed tensile strength and Young’s modulus data with best fits determined for single and multiple parameter models to root morphological properties.ResultsRegression co-efficients and Akaike values showed that distance from root tip (taken as a proxy of root age) was the best single variable for prediction of both root tensile strength and Young’s modulus. Incorporation of both distance from root tip and root diameter and root type increased the reliability of predictions for root biomechanical properties from 47 to 57 % for tensile strength and 35 to 62 % for Young’s modulus.ConclusionsThe age effect may partly explain some scatter in both Young’s modulus and tensile strength to diameter relationship, commonly cited in the literature.

AB - Background and aimsThe biomechanics of root systems influence plant lodging resistance and soil structural stabilisation. Tissue age has the potential to influence root biomechanical properties through changes in cell wall chemistry, root anatomy and morphology. Within a root system the internal structures of roots are known to vary markedly within different root types. Nodal, seminal and lateral roots of Barley (Hordeum vulgare) have differing biomechanical behaviour in tension. This study examines the effects of root age on biomechanical properties of barley root types (Hordeum vulgare) under abiotic stress.MethodsRoot age was determined as a function of the distance from root tip with abiotic stresses consisting of waterlogging and restriction to root elongation rate through increased soil bulk density. Linear regression analyses were performed on log-transformed tensile strength and Young’s modulus data with best fits determined for single and multiple parameter models to root morphological properties.ResultsRegression co-efficients and Akaike values showed that distance from root tip (taken as a proxy of root age) was the best single variable for prediction of both root tensile strength and Young’s modulus. Incorporation of both distance from root tip and root diameter and root type increased the reliability of predictions for root biomechanical properties from 47 to 57 % for tensile strength and 35 to 62 % for Young’s modulus.ConclusionsThe age effect may partly explain some scatter in both Young’s modulus and tensile strength to diameter relationship, commonly cited in the literature.

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