Turgor Pressure, Volumetric Elastic Modulus, Osmotic Volume and Ultrastructure of Chlorella emersonii Grown at High and Low External NaCl

Chlorella emersonii (211/1 In) was grown at external NaCl concentrations ranging between 10 and 335 mM (0-08-1-64 MPa). Previous studies showed that there was no significant change in the internal concentrations of Na+ or CI" over this range, the concentrations remaining below 35 mM. Relative growth rates of C. emersonii were 30-45% lower in 335 mM NaCl than in 1-0 mM NaCl. Turgor pressure varied with the osmotic pressure of the growth medium. Plots of cell volume versus (external osmotic pressure)"1 indicated that cells grown in 1-0 mM NaCl (0-08 MPa) had turgor pressures ranging from 0-5 to 0-8 MPa, while cells in 335 mM NaCl (1-64 MPa) had turgor pressures

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