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• W78184245 startingPage "129" @default.
• W78184245 abstract "ABSTRACT Phytosiderophores (PS) are Fe (III)-solubilizing compounds released by the roots of Poaceae. Although still poorly quantified, the available evidence suggests that concentrations of PS in the rhizosphere are between a few and 100 μM. Daily cycles of PS in the rhizosphere occur with inputs from plants roots in the morning, the majority of PS being degraded by microorganisms, reabsorbed by plants, or adsorbed to soil solids throughout each day. Release of PS due to Fe deficiency, and direct uptake of the Fe(III)–PS complex by grass roots have been well demonstrated, but the release of PS in response to other metal deficiencies and the uptake of other metal–PS complexes is more controversial. However, irrespective of whether field-grown plants excrete PS in response to deficiencies of micronutrients other than Fe or whether they absorb significant quantities of other metal–PS complexes, metal-binding by PS in the rhizosphere may have more general implications for increased solubilization and mobilization of metals. Studies have shown that PS can solubilize other metals (e.g. Cu, Cd, Ni, Zn) in both contaminated and uncontaminated substrates. However, careful assessment of these studies reveals the use of unrealistically high concentrations of PS, poor quantification of the PS remaining in the aqueous phase, utilization of strong artificial metal sinks such as chelating resins and dialysis tubes, or microbial degradation, all of which may produce confounded results. Clearly, there is a need for more direct measurements of PS in rhizosphere soil, but in their absence, we investigated the issues by using a geochemical approach and conceptual modeling. The evidence suggests that PS could provide a soluble pool of metals for uptake with a number of potential implications: (1) increasing the bioavailability of trace metals where deficiency is the primary concern; (2) increasing the bioavailability of metals where phytotoxicity is the main concern; (3) increasing the potential for food-chain transfer hazards for metals such as Cd, where toxicity to humans and animals is the chief concern; and (4) increasing competition between Fe(III) and other metals for binding to PS complexes that may reduce solubilized Fe(III), leading to Fe deficiency." @default.
• W78184245 created "2016-06-24" @default.
• W78184245 creator A5028076782 @default.
• W78184245 creator A5069302909 @default.
• W78184245 date "2005-01-01" @default.
• W78184245 modified "2023-10-16" @default.
• W78184245 title "Metal complexation by phytosiderophores in the rhizosphere" @default.
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• W78184245 doi "https://doi.org/10.1016/b978-044451997-9/50006-4" @default.
• W78184245 hasPublicationYear "2005" @default.
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