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Exopolysaccharide production by S. meliloti on plates with different phosphate concentrations. Plates with 0.1 mM (1 and 3) or 100 mM (2 and 4) K2HPO4 were prepared as indicated in Materials and Methods. Plates 1 and 2: A, Rm1021; B, expA; C, exoY; and D, exoY expA. Plates 3 and 4: E, expR101; F, expR101 expA; and G, expR101 exoY.
