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Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling

AIMS: To test if multi–surface models can provide a soil-specific prediction of metal mobilization by phytosiderophores (PS) based on the characteristics of individual soils. METHODS: Mechanistic multi-surface chemical equilibrium modeling was applied for obtaining soil-specific predictions of metal...

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Autores principales: Schenkeveld, W. D. C., Oburger, E., Gruber, B., Schindlegger, Y., Hann, S., Puschenreiter, M., Kraemer, S. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer International Publishing 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4372826/
https://www.ncbi.nlm.nih.gov/pubmed/25834291
http://dx.doi.org/10.1007/s11104-014-2128-3
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author Schenkeveld, W. D. C.
Oburger, E.
Gruber, B.
Schindlegger, Y.
Hann, S.
Puschenreiter, M.
Kraemer, S. M.
author_facet Schenkeveld, W. D. C.
Oburger, E.
Gruber, B.
Schindlegger, Y.
Hann, S.
Puschenreiter, M.
Kraemer, S. M.
author_sort Schenkeveld, W. D. C.
collection PubMed
description AIMS: To test if multi–surface models can provide a soil-specific prediction of metal mobilization by phytosiderophores (PS) based on the characteristics of individual soils. METHODS: Mechanistic multi-surface chemical equilibrium modeling was applied for obtaining soil-specific predictions of metal and PS speciation upon interaction of the PS 2’-deoxymugineic acid (DMA) with 6 soils differing in availability of Fe and other metals. Results from multi-surface modeling were compared with empirical data from soil interaction experiments. RESULTS: For soils in which equilibrium was reached during the interaction experiment, multi-surface models could well predict PS equilibrium speciation. However, in uncontaminated calcareous soils, equilibrium was not reached within a week, and experimental and modeled DMA speciation differed considerably. In soils with circum-neutral pH, on which Fe deficiency is likely to occur, no substantial Fe mobilization by DMA was predicted. However, in all but the contaminated soils, Fe mobilization by DMA was observed experimentally. Cu and Ni were the quantitatively most important metals competing with Fe for complexation and mobilization by DMA. CONCLUSION: Thermodynamics are unable to explain the role of PS as Fe carrier in calcareous soils, and the kinetic aspects of metal mobilization by PS need to be closer examined in order to understand the mechanisms underlying strategy II Fe acquisition. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11104-014-2128-3) contains supplementary material, which is available to authorized users.
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spelling pubmed-43728262015-03-30 Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling Schenkeveld, W. D. C. Oburger, E. Gruber, B. Schindlegger, Y. Hann, S. Puschenreiter, M. Kraemer, S. M. Plant Soil Regular Article AIMS: To test if multi–surface models can provide a soil-specific prediction of metal mobilization by phytosiderophores (PS) based on the characteristics of individual soils. METHODS: Mechanistic multi-surface chemical equilibrium modeling was applied for obtaining soil-specific predictions of metal and PS speciation upon interaction of the PS 2’-deoxymugineic acid (DMA) with 6 soils differing in availability of Fe and other metals. Results from multi-surface modeling were compared with empirical data from soil interaction experiments. RESULTS: For soils in which equilibrium was reached during the interaction experiment, multi-surface models could well predict PS equilibrium speciation. However, in uncontaminated calcareous soils, equilibrium was not reached within a week, and experimental and modeled DMA speciation differed considerably. In soils with circum-neutral pH, on which Fe deficiency is likely to occur, no substantial Fe mobilization by DMA was predicted. However, in all but the contaminated soils, Fe mobilization by DMA was observed experimentally. Cu and Ni were the quantitatively most important metals competing with Fe for complexation and mobilization by DMA. CONCLUSION: Thermodynamics are unable to explain the role of PS as Fe carrier in calcareous soils, and the kinetic aspects of metal mobilization by PS need to be closer examined in order to understand the mechanisms underlying strategy II Fe acquisition. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11104-014-2128-3) contains supplementary material, which is available to authorized users. Springer International Publishing 2014-06-04 2014 /pmc/articles/PMC4372826/ /pubmed/25834291 http://dx.doi.org/10.1007/s11104-014-2128-3 Text en © The Author(s) 2014 https://creativecommons.org/licenses/by/4.0/ Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
spellingShingle Regular Article
Schenkeveld, W. D. C.
Oburger, E.
Gruber, B.
Schindlegger, Y.
Hann, S.
Puschenreiter, M.
Kraemer, S. M.
Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling
title Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling
title_full Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling
title_fullStr Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling
title_full_unstemmed Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling
title_short Metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling
title_sort metal mobilization from soils by phytosiderophores – experiment and equilibrium modeling
topic Regular Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4372826/
https://www.ncbi.nlm.nih.gov/pubmed/25834291
http://dx.doi.org/10.1007/s11104-014-2128-3
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