TABLE 2.
Na+ resistance of B. subtilis strains with mutations in the tetA(L) and/or selected mrp genes
| Strain | MIC (M)a of Na+ at:
|
|
|---|---|---|
| pH 7.0 | pH 8.3 | |
| Wild type | 1.30 ± 0.05 | 0.71 ± 0.03 |
| JC112 | 0.80 ± 0.03 | 0.40 ± 0.02 |
| VK123 | 0.27 ± 0.02 | 0.025 ± 0.01 |
| VK1 | 0.15 ± 0.02 | 0.026 ± 0.01 |
| VK1/mrpA | 1.15 ± 0.04 | 0.45 ± 0.02 |
| VK15 | 0.27 ± 0.03 | 0.026 ± 0.01 |
| VK15/mrpF | 0.45 ± 0.03 | 0.15 ± 0.02 |
| VK15/mrpFG | 0.65 ± 0.03 | 0.25 ± 0.02 |
| VK6 | 0.29 ± 0.03 | 0.025 ± 0.01 |
| VK6/mrpA | 0.62 ± 0.04 | 0.15 ± 0.02 |
| VK6/mrpF | 0.46 ± 0.02 | 0.16 ± 0.01 |
| VK6/mrpFG | 0.45 ± 0.03 | 0.15 ± 0.02 |
| VKN1 | 0.09 ± 0.03 | 0.024 ± 0.01 |
| VKN1/mrpA | 0.12 ± 0.02 | 0.035 ± 0.02 |
| VKN1/mrpFG | 0.14 ± 0.03 | 0.027 ± 0.02 |
| VKN1/mrpF | 0.092 ± 0.02 | 0.026 ± 0.02 |
a
Minimal Na+ concentration at which no growth was observed after 15 h. The values are means ± standard deviations.