Ion Compartmentation in the Marine FungusDendryphiella salinain Response to Salinity: X-ray Microanalysis

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Abstract
X-ray microanalysis was performed on hyphae of the filamentous marine fungus Dendryphiella salina growing at different salinities to give sodium, potassium and chloride concentrations in the cytoplasm, vacuole and cell wall. Sodium and chloride concentrations increased with salinity in all compartments. Cytoplasmic and vacuolar sodium and chloride concentration were broadly similar, and vacuolar contents represented, at most, 19% of the total protoplasmic content of an individual ion species. Potassium concentrations decreased to some extent with salinity, although concentrations were not severely affected by competition with sodium uptake. Results are discussed with regard to the role of ions in the overall osmotic adjustment in this species.