Open AccessElectrical properties of Lupinus angustifolius L. stem. II. Accommodation and anode break excitation
Author(s) -
Tadeusz Zawadzki,
Halina Dziubińska
Publication year - 2015
Publication title -
acta societatis botanicorum poloniae
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 29
eISSN - 2083-9480
pISSN - 0001-6977
DOI - 10.5586/asbp.1979.010
Subject(s) - rheobase , accommodation , excitation , lupinus angustifolius , stimulus (psychology) , limiting , chemistry , time constant , biophysics , membrane potential , physics , biology , botany , optics , electrical engineering , mechanical engineering , psychology , engineering , quantum mechanics , psychotherapist
Under electrical stimulation of Lupinus stem phenomena of accommodation and anode break excitation appear. Their characteristic is the same as in the axon or nerve. Only their duration is about 103-104 longer in plants. The constant characterizing the rate of accommodation was calculated. A limiting threshold value was found beyond which excitation occurs, irrespective of the rate of stimulus rise (voltage gradient). The accommodation rate is approximately constant, whereas the range of accommodation varies and is dependent on the difference between the rheobase value and the limiting threshold value. Hence plants with a low rheobase are characterized by a wider range of accommodation. It is suggested that the changes in potential (including AP) recorded on the stem surface are connected with changes of the potential on cell membranes (Sibaoka, 1962)