TABLE 4.
Influence of E. cloacae strains differing in enterobactin and aerobactin production on population size of P. putida N1R Pvd− (pvd-inaZ) in the rhizosphere of cucumber
| E. cloacae straina | Rhizosphere population size of N1R Pvd− (pvd-inaZ)b (log10 [CFU/root system] ± SEM)
|
|
|---|---|---|
| Day 1 | Day 5 | |
| None | 5.40 ± 0.25 | 7.04 ± 0.12 |
| JL1157 | 5.88 ± 0.24 | 6.79 ± 0.14 |
| LA122 | 4.75 ± 0.24 | 6.43 ± 0.13 |
| LA266 | 5.21 ± 0.17 | 6.72 ± 0.15 |
| LA235 | 4.26 ± 0.15 | 5.97 ± 0.35 |
Root systems were dipped in aqueous suspensions of N1R Pvd− (pvd-inaZ) alone or in combination with a strain of E. cloacae (JL1157, LA122, LA266, or LA235) before planting in sterilized soil. Initial populations of E. cloacae on inoculated roots were approximately 104 CFU/root system. Mean population sizes of E. cloacae on five replicate root systems were 6.3 to 6.6 log10 (CFU/root system) at day 1 and 7.6 to 7.9 log10 (CFU/root system) at day 5.
Initial population size of N1R Pvd− (pvd-inaZ) on inoculated roots was approximately 104 CFU/root system. Mean rhizosphere population sizes were estimated from five replicate root systems at 1 or 5 days after inoculation with bacterial strains.