Figure 2.

Population dynamics of P. syringae (a) and disease (b) in cantaloupe seedlings after inoculation with either HR⁺ or HR⁻ strains. HR⁺ strains are represented by solid lines and symbols (♦ CC0654; ▴ DC3000; ▪ USA-032) and HR⁻ strains by dashed lines and open symbols (⋄ TA-043; ▵ SZ-030; □ CC1504). At each sampling time, 3–6 seedlings were cut off at the soil level and individually macerated to determine population densities. Disease was rated on each of the 3–6 plants sampled. Plants inoculated with strains SZ-030 and CC1504 did not show any disease symptoms. Only one plant inoculated with strain DC3000 showed disease symptoms at 2 days after inoculation. For strain TA-043, half of the inoculated plants showed symptoms at 7 days after inoculation. Error bars indicate the s.e.m.