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The method of cyclic voltammetry was applied to a bioelectrochemical system consisting of a palladium electrode inserted into a cotton plant and a reference electrode connected to the stem. Preliminary in vitro tests of the electrode system in a phosphate buffer established basic cyclic voltammograms and the presence of palladium oxides. Subsequent in vivo tests in a commercial cotton field yielded the same basic voltammogram. These results indicate the absence of an active redox couple in the plant apoplast electrolyte in the range of rest potentials normally encountered by the electrode system.Additionalin vitro tests suggest the influence of oxygen on the rest potentials of cotton. The voltammograms from different anatomical regions of the plant were essentially the same. During the last decade, an electrochemical technique has been developed which permits the measurement of electrical potentials of higher plants (1). The Key words: biological, electrode, voltammetry, metal. technique consist of placing a noble metal electrode into plant tissue and a silver chloride reference electro.de in the soil to form a galvanic circuit. A high impedance amplifier measures the electrical potential ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-17 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-17 to IP

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