Ion compartmentation in Porphyra umbilicalis determined by electron-probe X-ray microanalysis |
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| Authors: | Christian Wiencke Ralf Stelzer André Läuchli |
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| Institution: | 1. Botanisches Institut der Tier?rztlichen Hochschule, Bünteweg 17D, D-3000, Hannover 71, Federal Republic of Germany
2. Department of Land, Air and Water Resources, University of California, 95616, Davis, CA, USA
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| Abstract: | The ion composition of cell compartments in the intertidal red alga Porphyra umbilicalis adapted for two weeks in 3.5 x artificial seawater was determined by X-ray microanalysis of unfixed, frozen, bulk specimens. A procedure is described for the calculation of ion concentrations in the main cell compartment, cytoplasm, vacuoles and plastid. The results indicate high K+ and low Na+ concentrations in cytoplasm and plastid. Sodium ions are preferentially localized in vacuoles. Both, vacuoles and plastid contain high Cl- concentrations. |
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