Figure 5. PVs of strain M6 and 7a1 are compromised in their virulence in seed transmission assays.
Melon or watermelon seeds were inoculated with bacterial strains at 106 CFU/ml, sown and maintained in the greenhouse at 28°C for 14 days. The percentage of seedling death was determined thorough the experiment. A. Melon seedlings following inoculation with parental strain M6 and variants M6V1 and M6V2. B. Watermelon seedlings following inoculation with parental strain 7a1 and variants 7a1V1 and 7a1V2. For each combination of plant/strains, data from one experiment (with 16 plants per treatment), out of three with similar results are shown. C. Symptom severity of melon (1 to 3) and watermelon (4 to 6) plants from seed transmission assays with parental strains and PVs. 1, M6; 2, M6V1; 3, M6V2; 4, 7a1; 5, 7a1V1; 6, 7a1V2. Pictures were taken 12 days after inoculation.