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Titel (primär) Analysis of nickel concentration profiles around the roots of the hyperaccumulator plant Berkheya coddii using MRI and numerical simulations
Autor Moradi, A.B.; Oswald, S.E.; Nordmeyer-Massner, J.A.; Pruessmann, K.P.; Robinson, B.H.; Schulin, R.;
Journal / Serie Plant and Soil
Erscheinungsjahr 2010
Department HDG;
Band/Volume 328
Heft 1-2
Sprache englisch;
Keywords Berkheya coddii; Concentration gradient; Hyperaccumulator; Magnetic resonance imaging; MIN3P; Modelling; Nickel; Uptake
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.
ID 10320
dauerhafte UFZ-Verlinkung http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=10320
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), 291 - 302