Physiological responses of Nodularia harveyana to osmotic stress |
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Authors: | S. R. C. Warr R. H. Reed W. D. P. Stewart |
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Affiliation: | (1) Department of Biological Sciences, University of Dundee, DD1 4HN Dundee, Scotland;(2) A. R. C. Research Group on Cyanobacteria, University of Dundee, DD1 4HN Dundee, Scotland |
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Abstract: | The effects of salinity stress on biomass yield, photosynthetic O2 evolution and nitrogenase activity were investigated using axenic cultures of Nodularia harveyana (Thwaites) Thuret originally isolated from a salt marsh at Gibraltar Point, Lincolnshire, UK in 1971 and studied in this laboratory in 1983. Biomass yields, as chlorophyll a per culture, were highest in the 0 to 100% seawater (0 to 35 sea salt) range with negligible growth in 200% seawater; growth on NH4+was greater than on N2 and NO3-, which did not differ significantly from each other. In short-term experiments, photosynthetic O2 evolution remained high at salinities up to 150% seawater (52.5 sea salt); nitrogenase activity remained high at salinities up to 100% seawater (35 sea salt). The major internal low molecular weight carbohydrate which accumulated in response to increased salinity was sucrose, the levels of which fluctuated markedly and rapidly in response to salinity change. |
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