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The hydraulic resistance (the reciprocal of the hydraulic conductivity Lp) Lp-1 was measured in cells of Chara corallina by the method of transcellular osmosis. Treatment of cells with 100 mM KCl decreased Lp-1 significantly. Subsequent treatment of the cells with 70 mM CaCl2 recovered the decreased Lp-1 to the original value. To know whether K+ or Ca2+/Mg2+ acts on the cell wall and/or the membrane, the hydraulic resistances of the cell wall (Lpw-1) and that of the membrane (Lpm-1) were determined in one and the same cell. For this, a