The Water Permeability of Cells of Chara Australis R.Br.

Abstract

Measurements have been made of the "osmotic" water permeability (Pos) of internodal cells of Ohara australis using the method of transcellular osmosis. The mean value was 5·6 /1-3//1-2 ? min. atm, which is close to that obtained by Kamiya and Tazawa (1956) with cells of Nitella. A small difference between rates of water movement into and out of the cell is ascribed to an assymetry of the driving forces in the system and not to a real difference in permeability.