Journal Article

Calcium-Dependent Voltage Transients Evoked by Illumination in the Liverwort <i>Conocephalum conicum</i>

Elzbieta Krol and Kazimierz Trebacz

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 40, issue 1, pages 17-24
Published in print January 1999 | ISSN: 0032-0781
Published online January 1999 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029470
Calcium-Dependent Voltage Transients Evoked by Illumination in the Liverwort Conocephalum conicum

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The liverwort Conocephalum conicum with anion channels blocked by anthracene-9-carboxylic acid (A-9-C) and potassium channels blocked by tetraethylammonium (TEA) generates dose-dependent responses to illumination further called voltage transients (VTs). Unlike the action potentials in untreated Conocephalum thalli, VTs do not propagate and cannot be evoked by electrical stimuli. Except A-9-C, two other anion channel inhibitors: ethacrinic and niflumic acids were effective in inducing VTs. These responses were blocked by DCMU, diethylstilbestrol and vanadate, which indicates that the photosynthetic electron transfer chain and the proton pump mediate in their generation. Light-induced VTs were considerably suppressed by calcium channel inhibitors: Mn2+, Gd3+, verapamil and nifedipine, and to a less extent by La3+ and diltiazem, provided that the incubation lasted more than 2 h. The participation of voltage-independent Ca2+ permeable channels in ionic mechanism of VTs is postulated.

Keywords: Action potential; Calcium channels; Conocephalum conicum; Light-induced potential changes; Proton pump

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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