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- W2019440284 abstract "Plants can mobilize iron (Fe) in the rhizosphere by non-specific and specific (adaptive) mechanisms. Non-specific mechanisms are, for example, rhizosphere acidification related to high cation-anion uptake ratios, or citric acid excretion. The specific mechanisms are root responses to Fe deficiency and can be classified into two different strategies. The Strategy I is typical for dicots and monocots except for grasses (graminaceous species) and is characterized by increased plasma membrane-bound reductase activity, enhanced net excretion of protons and enhanced release of reducing compounds, mainly phenolics. The reductase activity is stimulated by low pH, and with supply of FeIII chelates, ferric reduction at the plasma membrane takes place prior to uptake. In contrast, in graminaceous species (Strategy II) these root responses are absent, but enhancement of release of FeIII chelating compounds - phytosiderophores - takes place. These phytosiderophores are very efficient in mobilizing FeIII from artificially prepared sparingly soluble inorganic compounds (e.g. FeIII hydroxide) and from calcareous soils. The ferrated phytosiderophores are taken up by grasses at rates 102 to 103 times higher than Fe supplied either as synthetic chelate or microbial siderophores (e.g. ferrioxamine B), indicating a specific membrane transport system for ferrated phytosiderophores in roots of grasses. In calcareous soils phytosiderophores not only mobilize Fe, but also Zn, Mn, and Cu by chelation. However, only the FeIII phytosiderophores are taken up preferentially by Fe deficient grasses. The ecological advantages and disadvantages of Strategy I and Strategy II for Fe acquisition from calcareous soils are discussed." @default.
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- W2019440284 date "1989-01-01" @default.
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- W2019440284 title "Role of root‐induced changes in the rhizosphere for iron acquisition in higher plants" @default.
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