title: Ion compartmentation in Porphyra umbilicalis determined by electron-probe X-ray microanalysis.
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.
authors.affiliation: Botanisches Institut der Tierärztlichen Hochschule, Bünteweg 17D, D-3000, Hannover 71, Federal Republic of Germany.
authors.forename: C
authors.initials: C
authors.lastname: Wiencke
authors.forename: R
authors.initials: R
authors.lastname: Stelzer
authors.forename: A
authors.initials: A
authors.lastname: Läuchli