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Plant and Soil

, Volume 427, Issue 1–2, pp 291–304 | Cite as

Root responses to domestication, precipitation and silicification: weeping meadow grass simplifies and alters toughness

  • James M. W. RyallsEmail author
  • Ben D. Moore
  • Scott N. Johnson
  • Myles Connor
  • Ivan Hiltpold
Regular Article

Abstract

Background and aims

Plant breeding usually focuses on conspicuous above-ground plant traits, yet roots fundamentally underpin plant fitness. Roots show phenotypic plasticity in response to soil conditions but it is unclear whether domesticated plants respond like their ancestors. We aimed to determine how root traits differed between ancestral and domesticated types of a meadow grass (Microlaena stipoides) under altered regimes of precipitation and soil silicon availability.

Methods

We subjected the two grass types to three simulated precipitation regimes (ambient, +50%/deluge and −50%/drought) in soil with (Si+) and without (Si−) silicon supplementation and then characterised root biomass, architectural complexity and toughness in addition to shoot traits.

Results

Domestication increased root tissue density, decreased specific root length (SRL) and decreased root architectural complexity. Domestication also increased root strength under Si− conditions but not Si+ conditions. Fine roots, SRL, architectural complexity and the force required to tear the roots all decreased under deluge. The ancestral and domesticated grasses responded similarly to precipitation, except that the latter had weaker roots (decreased fracture strain) under drought.

Conclusions

Domestication and increased precipitation caused changes in M. stipoides root traits that could be beneficial against some stresses (e.g. soil compaction, herbivory) but not others (e.g. drought).

Keywords

Deluge Drought Fracture strain Root architectural complexity Root trait selection Tensile strength 

Abbreviations

RTD

root tissue density

SRL

specific root length

SRA

specific root area

ANC

ancestral

DOM

domesticated

Si

silicon

N

nitrogen

C

carbon

Notes

Acknowledgements

This research was funded by a Discovery Project grant from the Australian Research Council (ARC DP140100636) awarded to SNJ and BDM and an internship from the Hawkesbury Institute for the Environment awarded to MC. We would like to thank Dr. I. Chivers (Native Seeds Pty Ltd., Australia) for providing the seeds.

Supplementary material

11104_2018_3650_MOESM1_ESM.docx (536 kb)
ESM 1 (DOCX 536 kb)

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • James M. W. Ryalls
    • 1
    • 2
    Email author
  • Ben D. Moore
    • 1
  • Scott N. Johnson
    • 1
  • Myles Connor
    • 1
  • Ivan Hiltpold
    • 1
    • 3
  1. 1.Hawkesbury Institute for the EnvironmentWestern Sydney UniversityRichmondAustralia
  2. 2.Centre for Agri-Environmental Research, School of Agriculture, Policy and DevelopmentUniversity of ReadingReadingUK
  3. 3.Department of Entomology and Wildlife EcologyUniversity of DelawareNewarkUSA

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