Turgor Regulation in a Brackish Water Charophyte, Lamprothamnium succinctum III. Changes in Cytoplasmic Free Amino Acids and Sucrose Contents during Turgor Regulation :

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  • Okazaki,Yoshiji
    Department of Biology, Faculty of Science, University of Tokyo:(Present)Department of Biology, Osaka Medical College
  • Sakano,Katsuhiro
    Department of Biology, Faculty of Science, University of Tokyo:(Present)Department of Applied Physiology, National Institute of Agrobiological Resources
  • Tazawa,Masashi
    Department of Biology, Faculty of Science, University of Tokyo

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Cytoplasm and cell sap of Lamprothamnium succinctum were analyzed separately for the contents of free amino acids and sucrose to find whether they contribute to turgor regulation. In the vacuole, both amino acids and sucrose were found to be minor components contributing to the generation of osmotic pressure. Their amounts were almost insensitive to changes in external osmotic pressure. In the cytoplasm, both amino acids and sucrose in the cytoplasm contributed about 20% to the osmotic pressure. Hypotonic treatment did not affect the contents of either, but hypertonic treatment, while not affecting the amino acid contents, caused a significant increase in sucrose content. The cytoplasmic sucrose content increased linearly with an increase in external osmotic pressure, accounting for 40% of the increased osmotic pressure.

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