Metal mobilization from soils by phytosiderophores - experiment and equilibrium modeling

Autor(en)

Walter Schenkeveld, Eva Oburger, Barbara Gruber, Yvonne Schindlegger, Stephan Hann, Markus Puschenreiter, Stephan Krämer

Abstrakt

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.

Organisation(en)

Externe Organisation(en)

Universität für Bodenkultur Wien, acib – Austrian Centre of Industrial Biotechnology

Journal

Plant and Soil: international journal on plant-soil relationships

Band

383

Seiten

59-71

Anzahl der Seiten

13

ISSN

0032-079X

DOI

https://doi.org/10.1007/s11104-014-2128-3

Publikationsdatum

2014

Peer-reviewed

Ja

ÖFOS 2012

104004 Chemische Biologie, 105906 Umweltgeowissenschaften

Schlagwörter

ASJC Scopus Sachgebiete

Soil Science, Plant Science

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/metal-mobilization-from-soils-by-phytosiderophores--experiment-and-equilibrium-modeling(a6e94494-09aa-443e-be63-cf28ec6970ca).html