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Plant and Soil

, Volume 423, Issue 1–2, pp 429–442 | Cite as

Rhizodeposition under drought is controlled by root growth rate and rhizosphere water content

  • Maire HolzEmail author
  • Mohsen Zarebanadkouki
  • Anders Kaestner
  • Yakov Kuzyakov
  • Andrea Carminati
Regular Article

Abstract

Aims

Rhizodeposition is an important energy source for soil microorganisms. It is therefore crucial to estimate the distribution of root derived carbon (C) in soil and how it changes with soil water content.

Methods

We tested how drought affects exudate distribution in the rhizosphere by coupling 14CO2 labelling of plants and phosphor imaging to estimate C allocation in roots. Rhizosphere water content was visualized by neutron radiography. A numerical model was employed to predict the exudate release and its spatiotemporal distribution along and around growing roots.

Results

Dry and wet plants allocated similar amounts of 14C into roots but root elongation decreased by 48% in dry soil leading to reduced longitudinal rhizosphere extension. Rhizosphere water content was identical (31%) independent of drought, presumably because of the high water retention by mucilage. The model predicted that the increase in rhizosphere water content will enhance diffusion of exudates especially in dry soil and increase their microbial decomposition.

Conclusion

Root growth and rhizosphere water content play an important role in C release by roots and in shaping the profiles of root exudates in the rhizosphere. The release of mucilage may be a plant strategy to maintain fast diffusion of exudates and high microbial activity even under water limitation.

Keywords

Root exudates Rhizosphere extension Mucilage Convection–diffusion model 14C imaging Neutron radiography 

Notes

Acknowledgements

We acknowledge the DFG for funding (Projects CA 921/3-1 and KU 1184/33-1) and ev. Studienwerk Villigst for funding the position of MH.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2017

Authors and Affiliations

  • Maire Holz
    • 1
    • 2
    Email author
  • Mohsen Zarebanadkouki
    • 2
  • Anders Kaestner
    • 3
  • Yakov Kuzyakov
    • 1
    • 4
  • Andrea Carminati
    • 2
  1. 1.Department of Agricultural Soil ScienceUniversity of GoettingenGoettingenGermany
  2. 2.Division of Soil PhysicsUniversity of BayreuthBayreuthGermany
  3. 3.Paul Scherrer InstiuteVilligenSwitzerland
  4. 4.Institute of Environmental SciencesKazan Federal UniversityKazanRussia

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