Figure 1

Swarming behaviour of S. meliloti strains. The swarming motility phenotype of S. meliloti wild-type strains Rm1021 and GR4 and their corresponding fadD-derivative mutants 1021FDC5 and QS77 was analyzed by inoculating aliquots (2 μl) of each strain prepared as described in Materials and Methods onto semisolid MM plates containing 0.6% purified agar. Replicates corresponding to the same strain were placed in a row. The photograph was taken 48 hours after inoculation and is a representative of at least three independent experiments.