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The in vitro growth and sporulation of Frankia isolate HFPCcI3, a nitrogen‐fixing symbiont of Casuarina, was inhibited by both the toxic and osmotic effects of sodium chloride. This was demonstrated by comparing HFPCcI3 halotolerance with its tolerance to metabolically neutral melibiose osmoticum at sodium chloride and melibiose concentrations from 0 to 500 mmol L‐1. The osmotolerance of this stra
