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Tonoplast fine structure and osmotic regulation in Porphyra umbilicalis

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Abstract

In Porphyra, an intertidal red alga, the fine structure of the tonoplast was studied by freeze-fracture electron microscopy. It was shown that density and size of intramembraneous particles on the protoplasmic fracture face vary with external osmotic potential. The frequency of particles grouped in size classes (calculated per cell) increases with increasing osmotic stress and shows a maximum in 3 to 4 x artificial seawater medium ASP12. It is concluded that the intensity of tonoplast transport, which probably is enhanced with increasing osmotic stress from 1 to 4 x media, is most likely correlated with a change in membrane fine structure of the tonoplast.

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Abbreviations

EF:

exoplasmic fracture face

PF:

protoplasmic fracture face

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Authors and Affiliations

  1. Botanisches Institut der Tierärztlichen Hochschule Hannover, Bünteweg 17D, D-3000, Hannover 71, Federal Republic of Germany

    Christian Wiencke & André Läuchli

  2. Department of Land, Air and Water Resources, University of California, 95616, Davis, CA, USA

    Christian Wiencke & André Läuchli

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  1. Christian Wiencke
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  2. André Läuchli
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Wiencke, C., Läuchli, A. Tonoplast fine structure and osmotic regulation in Porphyra umbilicalis . Planta 159, 342–346 (1983). https://doi.org/10.1007/BF00393173

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  • DOI: https://doi.org/10.1007/BF00393173

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