Nitrogen-fixing inhibition by KCl in a blue-green algaAnabaena cylindrica |
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Authors: | Yi Ping Guo Houliang Huang Kaiyao |
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Institution: | (1) College of Life Sciences, Wuhan University, 430072 Wuhan, China |
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Abstract: | Growing in the medium containing 0.10 mol/L KCl for three days, the nitrogen-fixing activity ofAnabaena cylindrica decreased by 95%. Extent of the inhibition was enchanced with increased KCl concentrations. The biggest decrease of nitrogen-fixing
activity was between 0.02–0.05 mol/L KCl. The same decline on growth was between 0.05–0.10 mol/L KCl. The longer treating-time
was, the lower nitrogen-fixing activity was. A short time of KCl-treatment (for 4 h) resulted in 66.4% decrease of the activity.
Under effecting of KCl for three days, the frequency of heterocyst differentiation decreased from 7.2% to 2.1%.
Supported by the National Natural Science Foundation of China
Yi Ping: born in 1974, Graduate student |
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Keywords: | Anabaena cylindrica salt stress nitrogen-fixing activity |
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