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Stoichiometric Correlation of Malate Accumulation with Auxin-dependent K⁺-H⁺ Exchange and Growth in Avena Coleoptile Segments ^1,2

^a Botanisches Institut der Technischen Hochschule, D-6100 Darmstadt, Germany

The action of auxin in the promotion of growth has been suggested in the literature to depend on cell wall acidification. In a former investigation by the present authors the electrochemical balance in auxin-induced proton extrusion was shown to be maintained by potassium net uptake. The present paper reports data demonstrating that the elongation of Avena coleoptile segments is accompanied by an accumulation of malate, which is stoichiometrically correlated with potassium uptake. We concluded that this malate accumulation is required in a mechanism regulating intracellular pH.

² The result of this paper has been communicated orally at the 1974 conference of the Deutsche Botanische Gesellschaft, Würzburg, September 26, 1974.