Open Access
Rhizosphere Acidification as a Response to Iron Deficiency in
C. Ric de Vos,Henk J. Lubberding,H. Frits Bienfait +2 more
- 01 Jan 1986
TL;DR: It is proposed that iron deficiency induces production of organic acids in the roots, which in beans leads to both proton excretion and an increased capacity to reduce ferric chelates via the induced electron transfer system in the root epidermis cells.
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Abstract: Iron deficiency in higher plants causes accumulation of salts of organic acids in the roots, the most characteristic being citrate. We show that citrate and malate accumulate in beans (Phaseolus vulgaris L. var Prelude), not because of a lack of the iron-containing enzyme aconitase (EC 4.2.1.3), but in close coupling to the extrusion of protons during rhizosphere acidification, one of the 'Fe-efficiency' reactions of dicotyledonous plants. When proton excretion is induced in roots of control bean plants by addition of fusicoccin, only malate, not citrate, is accumulated. We propose that iron deficiency induces production of organic acids in the roots, which in beans leads to both proton excretion and an increased capacity to reduce ferric chelates via the induced electron transfer system in the root epidermis cells. Plants growing under iron deficiency may employ different strategies to increase iron uptake: (a) dicotyledons and non-grass monocotyledons develop a strong ferric reduction activity at the root surface (2); moreover, they may acidify the rhizosphere by
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Citations
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Regulated redox processes at the plasmalemma of plant root cells and their function in iron uptake.
TL;DR: 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, oygen.
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