Summary
By modifying the technique of vacuolar perfusion, a new method for measuring the motive force of the rotational cytoplasmic streaming inNitella internodes was developed. The motive force, being almost independent of temperature in the range of 10–30‡ C, amounts to 1.4–2.0 dynes/cm2. The decrease in the rate of streaming with decrease in temperature is therefore explained in terms of the increase of cytoplasmic viscosity. Lowering of the tonicity of the cell sap decreases both motive force and rate of streaming, while heightening of tonicity increases both. The cell is without turgor pressure throughout. Inhibition of streaming byp-chloromerocuribenzoate is accounted for by an effect on the motive force, not on the cytoplasmic viscosity.
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The author wish to express his cordial thanks to Professor N.Kamiya of Osaka University for his valuable suggestions and advice throughout this work.
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Tazawa, M. Motive force of the cytoplasmic streaming inNitella . Protoplasma 65, 207–222 (1968). https://doi.org/10.1007/BF01666379
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DOI: https://doi.org/10.1007/BF01666379