The Turbo Reductase in Plant Plasma Membranes
Plants get hold of the necessary inor9nic constituents by absorption from the soil. Ions like K+, Mg2+, NO3 - are normally present in the soil solution. However, in normal soils, iron is only present at very low concentrations. Ferric is precipitated by OH- and can attain levels above 1 µM only at pH values below 3. In the presence of oxygen and organic matter, ferrous is rapidly oxidized to ferric. In water culture, plants need soluble iron concentrations (realized by chelation with compounds like EDTA) around 1 µM (Lindsay and Schwab, 1982).
KeywordsHelianthus Annuus Ferric Salt Plant Plasma Membrane Ferric Chelate Ferric Reduce Activity
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