Action Potentials inLupinus angustifoliusL. Shoots

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Abstract
The spread of excitation in the stem, leaves, and root of Lupinus was investigated. The stem was electrically stimulated (d.c. pulses). Potential changes in the plant were measured with extracellular contact electrodes applied at various points to the plant surface. The action potential (AP) was found to propagate solely in the stem. It is extinguished in the region of the stem apex and the root neck. It does not propagate in leaves. There arise, however, in the leaves, root, and stem apex characteristic potential changes at the moment when the AP reaches these regions, but they do not have the characteristics of AP. Attempts at evoking excitation by electrical stimulation of leaves, root, or the item apex were unsuccessful. It appears therefore that the stem plays a special role in the spread of excitation in the plant. The regularities described here differ from those obtained by stimulation of plants with damage stimuli such as touching the shoot or a leaflet with a warmed glass rod (Paszewski and Zawadzki, 1976).

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