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Abstract
An apparent inhibition of cell division in the cyanobacterium Anacystis nidulans, caused by low Mg2+ concentrations, was abolished by increasing the medium Mn2+ concentration. Thus the mean cell volume of this organism growing in a Mg2+-limited chemostat culture decreased from an average of 1·3 to 0·4 μm3 following an increase in the reservoir Mn2+ concentration from 9·5 to 15 μm. This increase in Mn2+ had no effect on the steady-state biomass concentration, while a further elevation of the Mn2+ concentration lowered the biomass concentration, seemingly by making Mg2+ less available to the organism. The cellular Mn2+ concentration increased, while cellular Mg2+ was unaltered, following an increase in the medium Mn2+ concentration.
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© Society for General Microbiology, 1983