TABLE 2.
Effects of Δ(phoP)::Tn7 and Δ(phoO)::Tn7 mutations on the virulence of E. chrysanthemi 3937 on witloof chicory leaves at high and low Mg2+ concentrations
| Strain | MgCl2 concn | Size of lesion (cm2) (mean ± SE)a |
|---|---|---|
| 3937 (wild type) | 10 mM | 1.75 ± 0.03 |
| BT123 (phoP) | 10 mM | 1.20 ± 0.11b |
| 3937 (wild type) | 10 mM | 2.64 ± 0.17 |
| BT124 (phoQ) | 10 mM | 1.71 ± 0.10c |
| 3937 (wild type) | 10 μM | 1.16 ± 0.17 |
| BT123 (phoP) | 10 μM | 0.39 ± 0.03c |
| 3937 (wild type) | 10 μM | 1.23 ± 0.16 |
| BT124 (phoQ) | 10 μM | 0.50 ± 0.04c |
a
Values are the products of the length and width of the necrotic area.
b
Differences between wild-type and mutant strains are not significant according to the Student t test (P < 0.05).
c
Differences between wild-type and mutant strains are significant according to the Student t test (P < 0.05).