High-resolution synchrotron imaging shows that root hairs influence rhizosphere soil structure formation

Nicolai Koebernick, Keith R. Daly, Samuel D. Keyes, Timothy S. George, Lawrie K. Brown, Annette Raffan, Laura J. Cooper, Muhammad Naveed, Anthony G. Bengough, Ian Sinclair, Paul D. Hallett, Tiina Roose (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

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Abstract

In this paper, we provide direct evidence of the importance of root hairs on pore structure development at the root–soil interface during the early stage of crop establishment. This was achieved by use of high-resolution (c. 5 μm) synchrotron radiation computed tomography (SRCT) to visualise both the structure of root hairs and the soil pore structure in plant–soil microcosms. Two contrasting genotypes of barley (Hordeum vulgare), with and without root hairs, were grown for 8 d in microcosms packed with sandy loam soil at 1.2 g cm−3 dry bulk density. Root hairs were visualised within air-filled pore spaces, but not in the fine-textured soil regions. We found that the genotype with root hairs significantly altered the porosity and connectivity of the detectable pore space (> 5 μm) in the rhizosphere, as compared with the no-hair mutants. Both genotypes showed decreasing pore space between 0.8 and 0.1 mm from the root surface. Interestingly the root-hair-bearing genotype had a significantly greater soil pore volume-fraction at the root–soil interface. Effects of pore structure on diffusion and permeability were estimated to be functionally insignificant under saturated conditions when simulated using image-based modelling.
Original languageEnglish
Pages (from-to)124-135
Number of pages12
JournalNew Phytologist
Volume216
Issue number1
Early online date31 Jul 2017
DOIs
Publication statusPublished - 29 Aug 2017

Keywords

  • Hordeum vulgare
  • image-based modelling
  • noninvasive imaging
  • rhizosphere
  • root hairs
  • soil structure
  • synchrotron

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