Effects of Anion Channel Inhibitors on Light-Induced Potential Changes in the Liverwort Conocephalum conicum

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概要

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• The effect of three different anion channel inhibitors, namely (5-nitro-2-3-phenylpropyl-amino)benzoic acid (NPPB), Zn^<2+> and anthracene-9-carboxylic acid (A-9-C) on the action potential in the liverwort Conocephalum conicum were tested. All three caused an increase of the excitability threshold and a decrease of action potential amplitudes. This confirms the involvement of anion channels in the action potentials in Conocephalum. In plants treated with 1 or 2 mM A-9-C but not with NPPB (50 or 100 μM) and Zn^<2+> (100 or 500 μM), a light-induced transient depolarization occurred. In contrast to action potentials, the amplitude of this voltage transient depended on the light intensity and on the duration of preceding dark period. Also in contrast to action potentials, which are blocked by TEA, when applied together with A-9-C, TEA even increased the amplitudes of the light-induced voltage transients to up to 170 mV. The depolarization was obviously limited by the voltage-dependent opening of K^+ channels in the absence of TEA. The amplitude of the light-induced voltage transients (in the presence of TEA) increased in elevated CaCl_2 concentrations pointing to a Ca^<2+> permeability giving rise to the depolarization. However, none of the Ca^<2+> channel blockers tested, La^<3+>, Gd^<3+>, nifedipine, verapamil or diltiazem, had an effect. The light-induced voltage transients in A-9-C treated plants are quite different from light- and electrically triggered action potentials but share some similarities with light-induced generator potentials.

• 日本植物生理学会の論文

著者

• Simonis Wilhelm

  Lehrstuhl Botanik I Der Universitat Wurzburg

• Trebacz K

  Maria Curie‐sklodowska Univ. Lublin Pol

• Trebacz Kazimierz

  Department Of Biophysics Institute Of Biology Maria Curie-sklodowska University

• Schonknecht Gerald

  Lehrstuhl Botanik I der Universitat Wurzburg

関連論文

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• Effects of Anion Channel Inhibitors on Light-Induced Potential Changes in the Liverwort Conocephalum conicum
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• Low-Temperature Induced Transmembrane Potential Changes in the Liverwort Conocephalum conicum
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