Action Potentials in Lupinus angustifolius L. shoots

In Lupinus shoots electrical stimulus (DC) produces a voltagewave identical in character with the action potential in stimulatedsimple plant cells or in nerves. These action potentials wereregistered with a Kipp and Zonen Micrograph BD3, calomel electrodes,and an electrometer (input impedance, 10¹⁴ ). The wave form and its amplitude propagation velocity, pointof initiation, threshold value of the stimulus, and refractoryperiod were considered; the interdependence between these parametersand the magnitude and manner of application of the electricalstimulus are discussed. An analogy with Pflüger's laws was found.