Table 3. Root colonization by Bacillus amyloliquefaciens FZB42-Rif in the field.
| Cell form | Lateral root: Log 10 CFU g−1 root dry mass | ||
| at plantinga | at 2 weeks | at 5 weeks | |
| FZB42-Rif | |||
| CFU | 7.45 a | 7.22 a | 6.61 b |
| Spores | 7.25 a A | 7.13 a A | 6.44 b A |
| Vegetative cells | 7.02 a A | 6.48 b B | 6.10 b A |
| FZB42-Rif +Rs | |||
| CFU | – | 7.17 b | 6.41c |
| Spores | – | 7.05 a A | 6.30 b A |
| Vegetative cells | – | 6.44 b B | 5.69 c B |
| Tap-root: Log 10 CFU g −1 root dry mass | |||
| FZB42-Rif +Rs | |||
| CFU | – | 6.09 a | 5.15 b |
| Spores | – | 6.09 a A | 5. 01 b A |
| Vegetative cells | – | 5.50 a B | 4.44 b B |
Colonization density of FZB42-Rif on lateral and tap-roots at planting, 2 and 5 weeks after planting under the two different management practices, natural and higher pathogen pressure (+Rs). Three-way ANOVA according to Tukey HSD test revealed that the time (P = 2.16 10−11) significantly affected the density of FZB42-Rif in the rhizosphere of lettuce and that significant differences (P = 3.45 10−10) in density between spores and vegetative cells exist.
The data represents the density of FZB-Rif at planting time, hence are the same for both treatments FZB42-Rif and FZB42-Rif+Rs.
Density followed by the same small letters denote no significant differences between densities at various time points (per row) and capital letters between densities of spores and vegetative cells at the same time point (per column).