Journal Article

Inhibition of Electrogenesis by Aluminum in Characean Cells

Reona Takabatake and Teruo Shimmen

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 11, pages 1264-1271
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029114
Inhibition of Electrogenesis by Aluminum in Characean Cells

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The effects of aluminum (AI) on electrogenesis at the plasma membrane were examined in internodal cells of Chara corallina. After treating cells with 0.1 mM A1C13 (pH 4.5), we measured both the membrane potential and the membrane resistance in artificial pond water (pH 5.6). Electrogenesis at the membrane was significantly inhibited by the treatment with A1C13 A decrease in the pump current of the electrogenic proton pump and/or a decrease in the electrical resistance (an increase in conductance) of the passive diffusion channel were considered to be responsible for the inhibition of electrogenesis. CaCI3 had a partial ameliorating effect. Both malic acid and citric acid were very effective in reversing the effects of A1C13. In addition, these organic acids restored electrogenesis in cells that had been treated with A1CI3. It is suggested that Al affects electrogenesis from the exterior of the membrane, at least during the initial stages of treatment (4-24 h).

Keywords: Aluminum; Chara; Electrogenesis; Membrane potential; Membrane resistance

Journal Article.  0 words. 

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

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