Abstract
Summary The action of valinomycin on self-sustained transpiration oscillations of primary Avena leaves has been investigated. If given to excised, non-oscillating leaves, valinomycin induced transpiration oscillations. However, if given to excised leaves which were already oscillating (such oscillations being achieved by means of a previously published method), valinomycin damped the oscillations. Two hypothesis for the action of valinomycin were tested. Since details in the valinomycin effects could be repeated by a mechanical increase of the water flow resistance of the leaf, the conclusion drawn was that valinomycin interfered with the water regulatory system mainly by increasing the water flow resistance.
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