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When nickel-depleted cells of Anabaena cylindrica with nitrogenase repressed by growth on ammonia or into late stationary phase) were used to re-initiate nitrogen-fixing growth in fresh nickel-depleted medium a pronounced growth lag was observed. The growth lag was not observed in the presence of NiS04 (0.68~~). It was associated with delayed heterocyst differentiation, delayed nitrogenase synthesis and inhibition of pigment synthesis. During the lag a pronounced but transient accumulation of cyanophycin was observed, followed by an accumulation of urea in the growth medium. It is proposed that nickel depletion results in a diversion of ammonia from protein synthesis into cyanophycin, thereby delaying the de rwvo synthesis of proteins and enzymes required for the synthesis of active nitrogenase.

A Role for Nickel in Cyanobacterial Nitrogen Fixation and Growth via Cyanophycin Metabolism