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The cation requirements for fruiting body formation in the myxobacterium Stigmatella aurantiaca on agarose were determined. Calcium alone caused the cells to aggregate into interconnecting ridges. Under these conditions, stalk formation was severely depressed but sporangia frequently formed. The combination of magnesium and manganese was necessary for optimal formation of discrete aggregates (rather than ridges) and stalks. Manganese inhibited sporangium development. The inclusion of calcium into the magnesium-manganese medium overcame the inhibition by manganese and stimulated the production of multiple sporangia.

Effects of specific cations on aggregation and fruiting body morphology in the myxobacterium Stigmatella aurantiaca