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Analysis of nickel concentration profiles around the roots of the hyperaccumulator plant Berkheya coddii using MRI and numerical simulations


Moradi, A B; Oswald, S E; Nordmeyer-Massner, J A; Pruessmann, K P; Robinson, B H; Schulin, R (2010). Analysis of nickel concentration profiles around the roots of the hyperaccumulator plant Berkheya coddii using MRI and numerical simulations. Plant Soil, 328(1-2):1-12.

Abstract

Abstract Investigations of soil-root interactions are
hampered by the difficult experimental accessibility of
the rhizosphere. Here we show the potential of Magnetic
Resonance Imaging (MRI) as a non-destructive measurement
technique in combination with numerical
modelling to study the dynamics of the spatial distribution
of dissolved nickel (Ni2+) around the roots of the
nickel hyperaccumulator plant Berkheya coddii. Special
rhizoboxes were used in which a root monolayer
had been grown, separated from an adjacent inert glass
bead packing by a nylon membrane. After applying a
Ni2+ solution of 10 mg l−1, the rhizobox was imaged
repeatedly using MRI. The obtained temporal sequence
of 2-dimensional Ni2+ maps in the vicinity of
the roots showed that Ni2+ concentrations increased
towards the root plane, revealing an accumulation
pattern. Numerical modelling supported the Ni2+
distributions to result from advective water flow
towards the root plane, driven by transpiration, and
diffusion of Ni2+ tending to eliminate the concentration
gradient. With the model, we could study how the
accumulation pattern of Ni2+ in the root zone transforms
into a depletion pattern depending on transpiration
rate, solute uptake rate, and Ni2+ concentration in
solution.

Abstract Investigations of soil-root interactions are
hampered by the difficult experimental accessibility of
the rhizosphere. Here we show the potential of Magnetic
Resonance Imaging (MRI) as a non-destructive measurement
technique in combination with numerical
modelling to study the dynamics of the spatial distribution
of dissolved nickel (Ni2+) around the roots of the
nickel hyperaccumulator plant Berkheya coddii. Special
rhizoboxes were used in which a root monolayer
had been grown, separated from an adjacent inert glass
bead packing by a nylon membrane. After applying a
Ni2+ solution of 10 mg l−1, the rhizobox was imaged
repeatedly using MRI. The obtained temporal sequence
of 2-dimensional Ni2+ maps in the vicinity of
the roots showed that Ni2+ concentrations increased
towards the root plane, revealing an accumulation
pattern. Numerical modelling supported the Ni2+
distributions to result from advective water flow
towards the root plane, driven by transpiration, and
diffusion of Ni2+ tending to eliminate the concentration
gradient. With the model, we could study how the
accumulation pattern of Ni2+ in the root zone transforms
into a depletion pattern depending on transpiration
rate, solute uptake rate, and Ni2+ concentration in
solution.

Citations

16 citations in Web of Science®
14 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Biomedical Engineering
Dewey Decimal Classification:170 Ethics
610 Medicine & health
Language:English
Date:March 2010
Deposited On:03 Mar 2010 17:18
Last Modified:05 Apr 2016 13:43
Publisher:Springer
ISSN:0032-079X
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:https://doi.org/10.1007/s11104-009-0109-8
Permanent URL: https://doi.org/10.5167/uzh-26860

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