Abstract
The finding that fusicoccin (FC) markedly stimulates in higher plant tissues the energy-dependent transport of protons, monovalent cations, amino acids and sugars, suggested the possibility that it might specifically influence some general physicochemical characteristic of the cell membrane. The effect of FC on passive solute transport in vivo and on the electric conductance of artificial phospholipid membranes (BLM) was thus investigated. FC did not influence passive transport (uptake) of urea and thiourea and water permeability (influx and efflux) in pea internode, maize coleoptile and maize root segments. Also the electric conductance of BLM (soybean lecithin), and valinomycin-mediated K + transport across the BLM were not influenced by FC. These results are in agreement with the hypothesis that the effects of FC on solute transport depend on its interaction with some specific protein component, rather than on its capacity to induce specific changes of the lipid component of the cell membrane.
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