Abstract
Isosakuranetin (ISK; 5,7-dihydroxy 4′-methoxy flavanone) is a plant exudate with known cytotoxic and fungicide properties. When tested on wheat root segments at a concentration of 70 μM it inhibited K + dependent H + extrusion and net uptake of K +, while leaving the membrane potential (PD) unaltered. Fusicoccin (FC) + ISK treatment resulted in a slight membrane depolarization, while ISK alone did not alter O 2 consumption or alternative oxidase activity. ISK did not increase the pyruvate content in incubated root tissues or inhibit Fe 2+ uptake. The observed drop in K + net uptake depended on a decrease in K + influx into the cell, leading to the suggestion that ISK may act on wheat root segments as an inhibitor of K + permeation. The lack of proton leakage and membrane disruption by ISK made this compound a weak candidate as a phytoalexin, and suggesting a major role as an allelopathic molecule.
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