| Abstract: | X-ray microanalysis was performed on hyphae of the filamentousmarine fungus Dendryphiella salina growing at different salinitiesto give sodium, potassium and chloride concentrations in thecytoplasm, vacuole and cell wall. Sodium and chloride concentrationsincreased with salinity in all compartments. Cytoplasmic andvacuolar sodium and chloride concentration were broadly similar,and vacuolar contents represented, at most, 19% of the totalprotoplasmic content of an individual ion species. Potassiumconcentrations decreased to some extent with salinity, althoughconcentrations were not severely affected by competition withsodium uptake. Results are discussed with regard to the roleof ions in the overall osmotic adjustment in this species. Key words: Dendryphiella salina, marine fungus, salt-tolerance, x-ray microanalysis |
