Mobilization of heavy metals from contaminated calcareous soils by plant born, microbial and synthetic chelators and their uptake by wheat plants

Awad, F.; Römheld, Volker

doi:10.1080/01904160009382147

Cited by 50 publications

(26 citation statements)

References 20 publications

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“…3 are very similar qualitatively, and even quantitatively, and they are also reproducible (with respect to migration time, peak height, and area). This is astonishing, because at pH 9 a considerable amount of iron is present as colloidal Fe(OH) 3 which could easily alter the electrophoretic system by precipitation onto the silica surface. However, it is possible to Figure 3.…”

Section: Ce Separation Of Inorganic and Organic Fe Speciesmentioning

confidence: 99%

“…The iron chelates are then transported by a transport protein (ZmYS1) into the cytosol. This whole PS-mediated iron uptake system is called "system II" (in contrast to system I, which is effective for all other plant species), and it has been shown that also other metal ions are transported by this system (e.g., Zn, Cu, Ni, Cd) [3][4][5]. What is not yet fully understood, is the mechanism of further metal transport inside the plant, which most probably includes redox and ligand exchange reactions.…”

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confidence: 98%

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CE of phytosiderophores and related metal species in plants

et al. 2007

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Phytosiderophores (PS) and the closely related substance nicotianamine (NA) are key substances in metal uptake into graminaceous plants. Here, the CE separation of these substances and related metal species is demonstrated. In particular, the three PS 2'-deoxymugineic acid (DMA), mugineic acid (MA), and 3-epi-hydroxymugineic acid (epi-HMA), and NA, are separated using MES/Tris buffer at pH 7.3. Moreover, three Fe(III) species of the different PS are separated without any stability problems, which are often present in chromatographic analyses. Also divalent metal species of Cu, Ni, and Zn with the ligands DMA and NA are separated with the same method. By using a special, zwitterionic CE capillary, even the separation of two isomeric Fe(III) chelates with the ligand ethylenediamine-N,N'-bis(o-hydroxyphenyl)acetic acid (EDDHA) is possible (i.e., meso-Fe(III)-EDDHA and rac-Fe(III)-EDDHA), and for fast separations of NA and respective divalent and trivalent metal species, a polymer CE microchip with suppressed EOF is described. The proposed CE method is applicable to real plant samples, and enables to detect changes of metal species (Cu-DMA, Ni-NA), which are directly correlated to biological processes.

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Section: Ce Separation Of Inorganic and Organic Fe Speciesmentioning

confidence: 99%

mentioning

confidence: 98%

CE of phytosiderophores and related metal species in plants

et al. 2007

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“…Mench and Martin [94] found that soil Cd, Cu, Fe, Mn, Ni, and Zn were solubilized by root exudates of Nicotiana tabacum L., N. rustica L., and Zea mays L. Veeken and Hamelers [95] showed that the pH of the rhizosphere soils was relatively consistent between pH 3 and 5 regardless of the pH in the bulk soils, which may vary from less than 4 to greater than 8. Under the circumstances, the organic acids found in the rhizosphere are capable of forming complexes with trace element ions in solution [96][97][98], thus enhancing their mobilization and uptake by plants [99,100].…”

Section: Rationale For Root Exudate-based Trace Element Phytoavailabimentioning

confidence: 99%

Trace Elements in Biosolids‐Amended Soils

Chen

Chang

et al. 2010

Trace Elements in Soils

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“…The whole Fe(III)-phytosiderophore complex is subsequently taken up by Fe deficiency-inducible transporters of the YS1/YSL protein family (Römheld and Marschner, 1986;Curie et al, 2001). Metal chelation in the rhizosphere soil, however, is not specific for Fe(III), and consequently phytosiderophores have been found to mobilize a wide range of metals, including zinc (Zn), copper (Cu), manganese (Mn), nickel, and cadmium (Cd; Treeby et al, 1989;Awad and Rö mheld, 2000;Shenker et al, 2001). As assayed by two-electrode voltage clamp, most of these metal-phytosiderophore chelates were also transported via the maize (Zea mays) metal-phytosiderophore transporter ZmYS1 when expressed in Xenopus oocytes (Schaaf et al, 2004b).…”

mentioning

confidence: 99%