Table 2.
Population densities of culturable aerobic heterotrophic bacteria and the number of isolated bacteria from rhizospheres of S. alterniflora and J. roemerianus collected on Deer Island.
| Site | Plant species | Population density (Log CFU/g-1 ± SD)a |
The number of isolates recovered onb |
Total isolates per site | ||
|---|---|---|---|---|---|---|
| 1/3 KMB | 1/10 TSB | 1/3 KMB | 1/10 TSB | |||
| DIMR1 | S. alterniflorac | 7.5 ± 0.3 A | 7.7 ± 0.7 A∗ | 54 | 98 | 152 |
| DIMR2 | S. alterniflora | 7.2 ± 0.5 B | 7.6 ± 0.6 A∗ | 56 | 129 | 185 |
| Natural marsh | S. alterniflora | 7.0 ± 0.5 B | 7.2 ± 0.4 B∗ | 82 | 108 | 190 |
| DIMR1 | J. roemerianusd | 6.4 ± 0.6 B | 6.6 ± 0.7 A† | 21 | 95 | 116 |
| Natural marsh | J. roemerianus | 6.7 ± 0.6 A | 6.7 ± 0.5 A† | 22 | 86 | 108 |
aPopulation densities of heterotrophic bacteria were determined on 1/3 KMB and 1/10 TSB by the terminal dilution endpoint assay. bMorphologically distinct rhizobacteria from the roots of S. alterniflora and J. roemerianus were selected by dilution plating on 11/3 KMB and 1/10 TSB. cDifferences among treatments with S. alterniflora were determined by standard one-way analysis of variance (ANOVA) with mean comparisons among treatments performed by the Fisher’s protected least significant difference (LSD) or ∗Kruskal–Wallis tests (both at P = 0.05). dDifferences among treatments with J. roemerianus were determined by the two-sample t-test or †Wilcoxon Rank Sum test (both at P = 0.05).