Table 2.
Relative proportion of bacterial orders that significantly (P < 0.05) change with plant growth, based on data from cDNA libraries.
| Bare | Bulk planted | Rhizospheric | P | |
|---|---|---|---|---|
| DAY 2 | ||||
| Firmicutes:Bacilli:Bacillales | 39.0 ± 1.3 | 28.5 ± 2.3 | - | 0.019 |
| Proteobacteria:Alphaproteobacteria:Sphingomonadales | 1.7 ± 0.0 | 1.4 ± 0.1 | - | 0.032 |
| Proteobacteria:Betaproteobacteria:Burkholderiales | 16.1 ± 1.8 | 6.3 ± 1.8 | - | 0.023 |
| Proteobacteria:Gammaproteobacteria:Pseudomonadales | 3.7 ± 0.4 | 26.8 ± 3.6 | - | 0.006 |
| DAY 4 | ||||
| Proteobacteria:Alphaproteobacteria:Caulobacterales | 4.4 ± 0.8 | 7.5 ± 0.8 | - | 0.050 |
| Proteobacteria:Alphaproteobacteria:Rhizobiales | 1.6 ± 0.1 | 2.5 ± 0.2 | - | 0.021 |
| DAY 6 | ||||
| Actinobacteria:Acidimicrobiia:Acidimicrobiales | 5.4 ± 0.3 [B] | 10.4 ± 0.3 [A] | 6.5 ± 0.3 [B] | 0.000 |
| Actinobacteria:Actinobacteria:Actinomycetales | 4.9 ± 0.1 [B] | 8.2 ± 0.6 [A] | 8.1 ± 0.1 [A] | 0.002 |
| Actinobacteria:Thermoleophilia:Solirubrobacterales | 1.1 ± 0.0 [A] | 1.2 ± 0.1 [A] | 0.7 ± 0.0 [B] | 0.001 |
| Proteobacteria:Alphaproteobacteria:Caulobacterales | 8.6 ± 0.4 [AB] | 8.1 ± 0.7 [B] | 11.5 ± 0.6 [A] | 0.026 |
| Proteobacteria:Alphaproteobacteria:Rhizobiales | 2.4 ± 0.2 [B] | 2.6 ± 0.1 [B] | 4.2 ± 0.3 [A] | 0.005 |
| Proteobacteria:Betaproteobacteria:Hydrogenophilales | 9.8 ± 0.9 [A] | 6.2 ± 0.4 [B] | 4.7 ± 0.5 [B] | 0.009 |
| Proteobacteria:Gammaproteobacteria:Pseudomonadales | 1.6 ± 0.3 [B] | 5.1 ± 1.0 [AB] | 8.7 ± 0.8 [A] | 0.004 |
| Proteobacteria:Gammaproteobacteria:Xanthomonadales | 1.6 ± 0.1 [B] | 2.5 ± 0.1 [A] | 2.2 ± 0.1 [A] | 0.004 |
| DAY 8 | ||||
| Actinobacteria:Acidimicrobiia:Acidimicrobiales | 4.4 ± 0.1 [B] | 10.0 ± 0.1 [A] | 8.5 ± 0.7 [A] | 0.001 |
| Actinobacteria:Actinobacteria:Actinomycetales | 4.4 ± 0.2 [B] | 12.7 ± 0.6 [A] | 13.8 ± 0.7 [A] | 0.000 |
| Actinobacteria:Thermoleophilia:Solirubrobacterales | 0.9 ± 0.1[A] | 1.0 ± 0.1 [A] | 0.6 ± 0.0 [B] | 0.011 |
| Proteobacteria:Alphaproteobacteria:Rhizobiales | 2.1 ± 0.1 [B] | 2.9 ± 0.1 [AB] | 4.5 ± 0.5 [A] | 0.012 |
| Proteobacteria:Alphaproteobacteria:Rhodospirillales | 3.1 ± 0.5 [A] | 1.1 ± 0.1 [B] | 1.0 ± 0.1 [B] | 0.013 |
| Proteobacteria:Alphaproteobacteria:Sphingomonadales | 20.6 ± 1.4 [A] | 7.6 ± 1.0 [B] | 6.0 ± 0.8 [B] | 0.000 |
| DAY 10 | ||||
| Actinobacteria:Acidimicrobiia:Acidimicrobiales | 3.9 ± 0.2 [C] | 12.0 ± 0.2 [A] | 8.9 ± 0.2 [B] | 0.000 |
| Actinobacteria:Actinobacteria:Actinomycetales | 4.9 ± 0.9 [B] | 15.0 ± 0.2 [A] | 15.6 ± 1.3 [A] | 0.001 |
| Firmicutes:Bacilli:Bacillales | 10.2 ± 1.9 [B] | 14.4 ± 0.8 [AB] | 18.2 ± 0.4 [A] | 0.025 |
| Proteobacteria:Alphaproteobacteria:Caulobacterales | 6.4 ± 0.1 [C] | 9.5 ± 0.3 [B] | 12.4 ± 0.4 [A] | 0.000 |
| Proteobacteria:Alphaproteobacteria:Rhizobiales | 1.6 ± 0.2 [B] | 2.8 ± 0.2 [A] | 3.5 ± 0.1 [A] | 0.001 |
| Proteobacteria:Alphaproteobacteria:Rhodospirillales | 2.5 ± 0.3 [A] | 1.0 ± 0.0 [B] | 0.8 ± 0.1 [B] | 0.003 |
| Proteobacteria:Alphaproteobacteria:Sphingomonadales | 23.3 ± 3.6 [A] | 8.0 ± 0.2 [B] | 5.8 ± 0.2 [B] | 0.005 |
| Proteobacteria:Betaproteobacteria:Hydrogenophilales | 5.0 ± 0.2 [A] | 3.5 ± 0.2 [B] | 3.5 ± 0.1 [B] | 0.004 |
Values are mean ± s.e.m. (n = 3) and bold face denote higher levels. For days 2 and 4, values in bare and bulk planted soil were compared using Student t-test. For days 6, 8, and 10, the effect of sample type was tested using ANOVA, with post-hoc comparison using Tukey-Kramer test.