Alkylguanidine Inhibition of Ion Absorption in Oat Roots

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Abstract
The effect of various alkylguanidines on ion absorption and energy metabolism in oat (Avena sativa cv. Goodfield) roots has been investigated. Of several alkylguanidines tested, octylguanidine was the most effective inhibitor of both K+ and Cl− absorption by excised roots. At 225 μm octylguanidine, the transport of both ions was inhibited within 60 seconds and to a similar extent. Octylguanidine inhibited mitochondrial oxidative phosphorylation and mitochondrial adenosine 5′-triphosphatase (ATPase). The plasma membrane ATPase was also inhibited if the membranes were diluted and pretreated with Triton X-100.