FIG. 1.

Bacteriolytic activity of group III inhibitor. Purified supernatant from an S. ipomoeae strain 91-03 culture was added to a final concentration of 20% (vol/vol) to logarithmically growing broth cultures of representative group I, II, or III strains, and at the indicated time points, samples of each culture were measured spectrophotometrically for absorbance at 600 nm (A) or were diluted serially and plated on agar media for subsequent determination of CFU (B). ▪, strain 88-35 (group II) without inhibitor; ▴, strain 78-61 (group I) without inhibitor; ⧫, strain 88-03 (group III) without inhibitor; □, strain 88-35 with inhibitor added; ▵, strain 78-61 with inhibitor added; ◊, strain 88-03 with inhibitor added.