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© 1990 Oxford University Press

RESEARCH-ARTICLE

Ion Compartmentation in the Marine Fungus Dendryphiella salina in Response to Salinity: X-ray Microanalysis

N. J. W. CLIPSON1, M. A. HAJIBAGHERI2 and D. H. JENNINGS1,3

1Department of Genetics and Microbiology, University of Liverpool P.O. Box 147, Liverpool L69 3BX, UK
2School of Biological Sciences, University of Sussex Brighton, Sussex BN1 9QG, UK

3 To whom correspondence should be addressed.

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.

Key words: Dendryphiella salina, marine fungus, salt-tolerance, x-ray microanalysis


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