Ion metabolism in a halophilic blue-green alga,Aphanothece halophytica |
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Authors: | Donald M Miller Jay H Jones John H Yopp Donald R Tindall Walter E Schmid |
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Institution: | (1) Department of Physiology, Southern Illinois University, 62901 Carbondale, Illinois, USA;(2) Department of Botany, Southern Illinois University, 62901 Carbondale, Illinois, USA |
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Abstract: | The intracellular ion content of the halophilic blue-green alga, Aphanothece halophytica was studied as a function of age, external sodium and external potassium concentration. Intracellular Na+ was found to be about 0.38 millimoles/g dry mass. Intracellular K+ concentrations were as high as 1 M and varied directly with external salinity. Intracellular Ca++ and Mg++ were in the range previously reported for fresh water blue-green algae despite their extremely high extracellular concentrations. Average cell size is consistent at room temperature with two exceptions. When the outside K+ is lower than 6.5 mM the cells tend to be smaller with less intracellular K+ and high Ca++. In stationary phase cultures the cells are larger with high intracellular Mg++ and low K+. |
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Keywords: | Aphanothece halophytica Ion metabolism Blue-green alga Halophilism |
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