Journal Article

PreJuSER-4582

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar ph optodes

Blossfeld, S.FZJ* ; Perriguey, J. ; Sterckeman, T. ; Morel, J.-L. ; Lösch, R.

2010
Springer Science + Business Media B.V Dordrecht [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/4398  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 mays L.) and ryegrass (Lolium perenne L.), 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.

Keyword(s): J ; Alpine pennycress ; Acidification ; Maize ; Alkalinization ; Cadmium ; Ryegrass ; Maize (auto) ; Alpine pennycress (auto) ; Ryegrass (auto) ; Cadmium (auto) ; Alkalinization (auto) ; Acidification (auto)

Note: This work was supported by the "Deutscher Akademischer Austausch Dienst" (DAAD) and the "Ministere de l'Education Nationale, de l'Enseignement Superieur et de la Recherche" within the framework of the PROCOPE programme in 2008.; The final publication is available at: http://www.springerlink.com/content/55431383x86127k2/; Record converted from JUWEL: 18.07.2013

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Research Program(s):

1. Terrestrische Umwelt (P24)

Appears in the scientific report 2010

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