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Planta

, Volume 239, Issue 3, pp 643–651 | Cite as

Root hair length and rhizosheath mass depend on soil porosity, strength and water content in barley genotypes

  • Rebecca E. Haling
  • Lawrie K. Brown
  • A. Glyn Bengough
  • Tracy A. Valentine
  • Philip J. White
  • Iain M. Young
  • Timothy S. GeorgeEmail author
Original Article

Abstract

Selecting plants with improved root hair growth is a key strategy for improving phosphorus-uptake efficiency in agriculture. While significant inter- and intra-specific variation is reported for root hair length, it is not known whether these phenotypic differences are exhibited under conditions that are known to affect root hair elongation. This work investigates the effect of soil strength, soil water content (SWC) and soil particle size (SPS) on the root hair length of different root hair genotypes of barley. The root hair and rhizosheath development of five root hair genotypes of barley (Hordeum vulgare L.) was compared in soils with penetrometer resistances ranging from 0.03 to 4.45 MPa (dry bulk densities 1.2–1.7 g cm−3). A “short” (SRH) and “long” root hair (LRH) genotype was selected to further investigate whether differentiation of these genotypes was related to SWC or SPS when grown in washed graded sand. In low-strength soil (<1.43 MPa), root hairs of the LRH genotype were on average 25 % longer than that of the SRH genotype. In high-strength soil, root hair length of the LRH genotype was shorter than that in low-strength soil and did not differ from that of the SRH genotype. Root hairs were shorter in wetter soils or soils with smaller particles, and again SRH and LRH did not differ in hair length. Longer root hairs were generally, but not always, associated with larger rhizosheaths, suggesting that mucilage adhesion was also important. The root hair growth of barley was found to be highly responsive to soil properties and this impacted on the expression of phenotypic differences in root hair length. While root hairs are an important trait for phosphorus acquisition in dense soils, the results highlight the importance of selecting multiple and potentially robust root traits to improve resource acquisition in agricultural systems.

Keywords

Compaction Hordeum vulgare Moisture Rhizosheath Rhizosphere Root elongation 

Abbreviations

BD

Bulk density

BRH

Bud root hair

FC

Field capacity

G

Genotype

LRH

Long root hair

NRH

No root hair

SE

Standard error

SPS

Soil particle size

SRH

Short root hair

SWC

Soil water content

WT

Wild type

Notes

Acknowledgments

The authors would like to thank Bruna Arruda and Joice Heidemann for assistance with the experimental work and Richard Simpson for valuable discussions. This work was funded by the Scottish Government through work package 3.3 and the University of New England Early Career Post-doctoral Initiative.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Rebecca E. Haling
    • 1
  • Lawrie K. Brown
    • 2
  • A. Glyn Bengough
    • 2
    • 3
  • Tracy A. Valentine
    • 2
  • Philip J. White
    • 2
  • Iain M. Young
    • 1
  • Timothy S. George
    • 2
    Email author
  1. 1.School of Environmental and Rural ScienceUniversity of New EnglandNSWAustralia
  2. 2.The James Hutton InstituteDundeeUK
  3. 3.Division of Civil EngineeringUniversity of DundeeDundeeUK

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