Abstract
Higher concentrations of NaCl inhibit the growth and reduce the specific growth rate of the freshwater cyanobacterium Anabaena doliolum. Among the nitrogen sources tried, nitrate protected the cyanobacterial cells most from salt toxicity. However, supplementing of medium with nitrate could increase the adaptability of the cells at sublethal doses but it would not permit growth at otherwise lethal doses of 300 mmol 1‐1 NaCl. Nitrate uptake was proportionally related to the NaCl level in the medium. The uptake of sodium was minimum when nitrate was simultaneously available to the cells, indicating the interaction of nitrate with the Na+ carrier. Na+ efflux was maximum in N2, ammonia, urea and nitrate in decreasing order. This led to the conclusion that Na+ influx plays the critical role in salt tolerance, rather than its efflux.
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