Journal Article

Studies on Alkaline Band Formation in <i>Chara corallina</i>: Ameliorating Effect of Ca<sup>2+</sup> on Inhibition Induced by Osmotic Shock

Teruo Shimmen, Satoko Yonemura, Mio Negoro and William J. Lucas

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 9, pages 957-960
Published in print September 2003 | ISSN: 0032-0781
Published online September 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg120
Studies on Alkaline Band Formation in Chara corallina: Ameliorating Effect of Ca2+ on Inhibition Induced by Osmotic Shock

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Although the decrease in cell turgor by application of sorbitol to the external medium did not inhibit the alkaline band formation in Chara corallina, recovery of normal turgor severely inhibited it. Alkaline-loading analysis suggested that the inhibition of alkaline band formation was caused by inhibition of HCO3 influx but not that of OH efflux. In the presence of 10 mM CaCl2, the capacity of alkaline band formation was maintained during osmotic treatment. Cells could not form alkaline bands, when plasmolysis was induced by application of sorbitol at a higher concentration. Addition of 10 mM CaCl2 could ameliorate the inhibition caused by plasmolyis.

Keywords: Keywords: Alkaline band — Chara — Photosynthesis — Plasmolysis — Osmotic pressure — Turgor pressure.; Abbreviations: APW, artificial pond water; BFS, band formation solution; TAPS, N-tris(hydroxymethyl)methyl-3-aminopropanesulfonic acid.

Journal Article.  3076 words.  Illustrated.

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

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