Regulated redox processes at the plasmalemma of plant root cells and their function in iron uptake.
Plants take up iron as ferric chelates or, after reduction, as ferrous ions. Ferric reduction takes place at the plasma membrane of the root epidermis cells by a transmembrane redox system, which can be activated when iron is getting short. It is proposed that this inducible system, with NADPH as electron donor, is separate from a system, presumably present in all plant cells, which transports electrons from NADH or NADPH to ferricyanide, or, in vivo, oxygen.
Bienfait
H F
HF
D002462:Cell Membrane / Q000502:physiology*; D004579:Electron Transport; D005290:Ferric Compounds / Q000378:metabolism; D005296:Ferrous Compounds / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000378:metabolism*; D007502:Iron Chelating Agents / Q000378:metabolism; D009243:NAD / Q000378:metabolism; D009249:NADP / Q000378:metabolism; D010084:Oxidation-Reduction; D059828:Plant Cells; D010944:Plants / Q000378:metabolism; D017262:Siderophores
D005290:Ferric Compounds; D005296:Ferrous Compounds; D007502:Iron Chelating Agents; D017262:Siderophores; D009243:NAD; D009249:NADP; D007501:Iron