Plant and Soil

, Volume 330, Issue 1, pp 173–184

Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar pH optodes

  • Stephan Blossfeld
  • Jérôme Perriguey
  • Thibault Sterckeman
  • Jean-Louis Morel
  • Rainer Lösch
Regular Article

DOI: 10.1007/s11104-009-0190-z

Cite this article as:
Blossfeld, S., Perriguey, J., Sterckeman, T. et al. Plant Soil (2010) 330: 173. doi:10.1007/s11104-009-0190-z

Abstract

The present study presents new insights into pH dynamics in the rhizosphere of alpine pennycress (Noccaea caerulescens (J. Presl & C. Presl) F.K. Mey), maize (Zea maysL.) and ryegrass (Lolium perenneL.), when growing on three soils contaminated by trace metals with initial pH values varying from 5.6 to 7.4. The pH dynamics were recorded, using a recently developed 2D imaging technique based on planar pH optodes. This showed that alpine pennycress and ryegrass alkalinized their rhizosphere by up to 1.7 and 1.5 pH units, respectively, whereas maize acidified its rhizosphere by up to −0.7 pH units. The alkalinization by the roots of alpine pennycress and ryegrass was permanent and not restricted to specific root zones, whereas the acidification along the maize roots was restricted to the elongation zone and thus only temporary. Calculations showed that such pH changes should have noticeable effects on the solubility of the trace metal in the rhizosphere, and therefore on their uptake by the plants. As a result, it is suggested that models for trace metal uptake should include precise knowledge of rhizospheric pH conditions.

Keywords

Maize Alpine pennycress Ryegrass Cadmium Alkalinization Acidification 

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Stephan Blossfeld
    • 1
    • 3
  • Jérôme Perriguey
    • 1
    • 4
  • Thibault Sterckeman
    • 1
  • Jean-Louis Morel
    • 1
  • Rainer Lösch
    • 2
  1. 1.Nancy Université, INRALaboratoire Sols et EnvironnementVandoeuvre-lès-Nancy cedexFrance
  2. 2.AschaffenburgGermany
  3. 3.Forschungszentrum Juelich, ICG-3, PhytosphereJuelichGermany
  4. 4.INRA, Centre de NancySDARChampenouxFrance

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