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Physiology of the motive force of protoplasmic streaming

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Summary

  1. 1.

    The motive force responsible for the protoplasmic streaming in the myxomycete plasmodium,Physarum polycephalum, was measured by means of the double-chamber method under the influence of various chemical agents.

  2. 2.

    The motive force rather increases than decreases under anaerobic state as well as under the effect of KCN. The process is reversible.

  3. 3.

    Monoiodoacetic acid and sodium fluoride, both fermentation poisons, decrease the strength of the force back of the protoplasmic streaming.

  4. 4.

    2,4-dinitrophenol inhibits the motive force production both under aerobic and anaerobic conditions.

  5. 5.

    ATP admitted from without markedly increases the motive force of the protoplasmic streaming. The effect is manifested several minutes after the reagent is applied and continues several ten minutes after the reagent is removed.

  6. 6.

    As the fermentation poisons depresses the generation of the motive force while conditions inhibiting respiration do not depress it, it was concluded that the direct energy source of the protoplasmic streaming is ATP synthesized by fermentation process.

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Authors and Affiliations

  1. Department of Biology, Faculty of Science, Osaka University, Japan

    Noburô Kamiya, Hiromichi Nakajima & Shigemi Abe

Authors
  1. Noburô Kamiya
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  2. Hiromichi Nakajima
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  3. Shigemi Abe
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Supported by a Grant for Fundamental Scientific Research from the Ministry of Education.

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Kamiya, N., Nakajima, H. & Abe, S. Physiology of the motive force of protoplasmic streaming. Protoplasma 48, 94–112 (1957). https://doi.org/10.1007/BF01252889

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  • DOI: https://doi.org/10.1007/BF01252889

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