Table 1.
Bacterial colonization in rhizosphere soils of Chinese cabbages treated with spontaneous rifampicin-resistant mutants, H26-2 Rif and H30-3 Rif under normal and stressed conditions
| Cultivars | DASa | Bacterial colonization [Log(cfu/g of soils)b | |||
|---|---|---|---|---|---|
|
| |||||
| H26-2 Rif | H30-3 Rif | ||||
|
|
|
||||
| Non-stress | Stresses | Non-stress | Stresses | ||
| Ryeokkwang | 1 | 4.83 ± 0.19 ac | 5.33 ± 0.11 A* | 4.26 ± 0.22 a | 4.00 ± 0.01 A |
| 3 | 4.85 ± 0.20 a | 4.96 ± 0.13 A | 3.66 ± 0.08 a | 4.01 ± 0.08 A* | |
| 5 | 4.74 ± 0.19 a | 4.98 ± 0.25 A | 4.21 ± 0.21 a | 3.83 ± 0.21 A | |
| Buram-3-ho | 1 | 5.17 ± 0.13 a* | 4.62 ± 0.20 A | 3.88 ± 0.18 a | 4.04 ± 0.28 A |
| 3 | 5.35 ± 0.09 a | 5.06 ± 0.28 A | 3.83 ± 0.03 a | 3.83 ± 0.10 A | |
| 5 | 4.72 ± 0.08 b | 4.56 ± 0.20 A | 4.05 ± 0.13 a | 4.04 ± 0.10 A | |
a
DAS; days after stress treatment
b
Bacterial colonization was determined by counting colony-forming unit (cfu) in pot soils at 1, 3, 5 d after stress treatment on Chinese cabbage plants.
c
Mean ± standard errors with same letters are not significantly different between DAS at each non-stress or stresses in cultivars according to the least significantly difference test at P < 0.05. An asterisk indicates significant difference between non-stress vs. stresses at each DAS according to the t-test. Experiments were conducted twice with four replicates each.