Table 2.
Plant growth-promoting characteristics of the isolates from grapevine rhizosphere soil.
| Strain | Drought tolerance (OD600 at −0.30MPa) | Indoleacetic acid (IAA) production (μg/ml) | Nitrogen fixation | Phosphorus-solubilizing circle (mm) | Phosphate dissolving (μg/ml) | Exopolysaccharides production (mg/mg protein) |
|---|---|---|---|---|---|---|
| DR1 | 0.25 | 4.46±0.27f | + | 6.51±0.29d | 49.37±0.39e | 4.10 |
| DR2 | – | 8.33±0.44cd | + | 7.62±0.30d | 52.25±0.64d | 4.44 |
| DR3 | 1.05 | 10.29±0.21b | + | 14.17±0.08a | 64.07±0.79a | 9.43 |
| DR4 | – | 9.08±0.20c | + | 9.91±0.24c | 57.06±0.48c | 4.16 |
| DR5 | – | 8.07±0.13d | + | 7.36±0.13d | 51.89±0.33d | 3.52 |
| DR6 | 0.84 | 11.14±0.11a | + | 11.65±0.91b | 58.97±0.17b | 7.38 |
| DR7 | – | 5.44±0.41e | + | 7.60±0.11d | 51.84±0.28d | – |
Values are the mean±SE (n=3). Different lowercase letters indicate significant differences according to Duncan’s multiple range test at the P<0.05 level.