Effect of calcium and trace metals (Cd, Cu, Mn, Ni, Zn) on root iron uptake in relation to chemical properties of the root-excreted ligands

Interferences of major cations (Ca 2+ , Mg 2+ ) and trace metals (TM, i.e. Cd 2+ , Cu 2+ , Mn 2+ , Ni 2+ and Zn 2+ ) in root Fe uptake were evaluated. Root Fe uptake was modelled including the reactions of the root exuded ligand with the soil major and trace cations. Fe uptake was simulated with dif...

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Bibliographic Details
Published in:Biometals 2023-10, Vol.36 (5), p.1013-1025
Main Authors: Moyne, Christian, Sterckeman, Thibault
Format: Article
Language:English
Subjects:
Biochemistry
Biomedical and Life Sciences
Cadmium
Calcium
Calcium ions
Cations
Cell Biology
Chemical properties
Contamination
Copper
Edetic acid
Environmental Sciences
Ethylenediaminetetraacetic acids
Exudation
Heavy metals
Iron
Life Sciences
Ligands
Magnesium
Manganese
Medicine/Public Health
Microbiology
Nickel
Nutrient deficiency
Oxalic acid
Pharmacology/Toxicology
Plant Physiology
Soil contamination
Stability
Stability constants
Trace metals
Zinc
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Summary:Interferences of major cations (Ca 2+ , Mg 2+ ) and trace metals (TM, i.e. Cd 2+ , Cu 2+ , Mn 2+ , Ni 2+ and Zn 2+ ) in root Fe uptake were evaluated. Root Fe uptake was modelled including the reactions of the root exuded ligand with the soil major and trace cations. Fe uptake was simulated with different ligands representing various affinities for the cations, the latter varying in concentration. The stability constant of Fe complexes ( K FeL ) does not influence Fe uptake, contrarily to the ligand parameters for Fe-hydroxide dissolution. Fe uptake decreases when K CaL or Ca 2+ in solution increases. Presence of TM has nearly no influence on Fe uptake when the TM complexes have low stability constants ( K ML ), as in the case of oxalate and citrate complexes. When ligands have high K ML , like EDTA, DFO-B or mugineic acid (MA), TM reduces Fe uptake by 51–55%, and much more in the case of TM contamination. Exudation of Fe ligands with low K ML has no negative effect on TM uptake, which can increase if the dissociation rate is high, as for Cu complexes. Ligands with high K ML (EDTA, DFO-B, MA) greatly reduce TM uptake, only if their hydrated cations can be absorbed. Calcium does not significantly reduce Fe uptake when Ca-complexes have K CaL  
ISSN:0966-0844
1572-8773
DOI:10.1007/s10534-023-00500-1