Biomechanics of nodal, seminal and lateral roots of barley

Effects of diameter, waterlogging and mechanical impedance

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

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Background and aims: Biomechanical properties of cereal root systems largely control both resistance to root lodging and their ability to stabilise soil. Abiotic stresses can greatly modify root system growth and form. In this paper the effect of waterlogging and moderate mechanical impedance on root biomechanics is studied for both lateral roots and the main axes of barley. Methods: Barley (Hordeum vulgare) plants were subjected to transient water-logging and moderate mechanical impedance in repacked soil columns. Roots were excavated, separated into types (nodal, seminal or lateral) and tested in tension to measure strength and elastic modulus. Results: Water-logging and mechanical impedance substantially changed root system growth whilst root biomechanical properties were affected by waterlogging. Root strength was generally greater in thin roots and depended on root type. For example, seminal roots 0.4-0.6 mm in diameter were approximately seven times stronger and five times stiffer than lateral roots of the same diameter when mechanically impeded. Root sample populations typically exhibited negative power-law relationships between root strength and diameter for all root types. Mechanical impedance slowed seminal root elongation by approximately 50 % and resulted in a 15 % and 11 % increase in the diameter of in nodal and seminal roots respectively. Power-law relationships between root diameter and root biomechanical properties corresponded to the different root types. Coefficients for between root diameter, strength and elastic modulus improved when separated by root type, with R values increasing in some roots from 0.05 to 0.71 for root strength and 0.08 to 0.74 for elastic modulus. Conclusions: Moderate mechanical impedance did not influence the tensile strength of roots, but, waterlogging diminished the relationship between root strength and diameter. Separation of root type improved predictions of root strength and elastic modulus using power-law regressions.
Original languageEnglish
Pages (from-to)407-418
Number of pages12
JournalPlant and Soil
Volume370
Issue number1
Early online date21 Feb 2013
DOIs
Publication statusPublished - Sep 2013

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biomechanics
waterlogging
impedance
flooded conditions
barley
strength (mechanics)
elastic modulus
modulus of elasticity
effect
root system
root systems
power law
root growth

Keywords

  • soil mechanical impedance
  • waterlogging
  • root biomechanics
  • abiotic stress

Cite this

Biomechanics of nodal, seminal and lateral roots of barley : Effects of diameter, waterlogging and mechanical impedance. / Loades, K. W.; Bengough, A. G.; Bransby, M. F.; Hallett, P. D.

In: Plant and Soil, Vol. 370, No. 1, 09.2013, p. 407-418.

Research output: Contribution to journalArticle

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AB - Background and aims: Biomechanical properties of cereal root systems largely control both resistance to root lodging and their ability to stabilise soil. Abiotic stresses can greatly modify root system growth and form. In this paper the effect of waterlogging and moderate mechanical impedance on root biomechanics is studied for both lateral roots and the main axes of barley. Methods: Barley (Hordeum vulgare) plants were subjected to transient water-logging and moderate mechanical impedance in repacked soil columns. Roots were excavated, separated into types (nodal, seminal or lateral) and tested in tension to measure strength and elastic modulus. Results: Water-logging and mechanical impedance substantially changed root system growth whilst root biomechanical properties were affected by waterlogging. Root strength was generally greater in thin roots and depended on root type. For example, seminal roots 0.4-0.6 mm in diameter were approximately seven times stronger and five times stiffer than lateral roots of the same diameter when mechanically impeded. Root sample populations typically exhibited negative power-law relationships between root strength and diameter for all root types. Mechanical impedance slowed seminal root elongation by approximately 50 % and resulted in a 15 % and 11 % increase in the diameter of in nodal and seminal roots respectively. Power-law relationships between root diameter and root biomechanical properties corresponded to the different root types. Coefficients for between root diameter, strength and elastic modulus improved when separated by root type, with R values increasing in some roots from 0.05 to 0.71 for root strength and 0.08 to 0.74 for elastic modulus. Conclusions: Moderate mechanical impedance did not influence the tensile strength of roots, but, waterlogging diminished the relationship between root strength and diameter. Separation of root type improved predictions of root strength and elastic modulus using power-law regressions.

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