Table 3.
Plant growth promoting activities of twelve rice endophytic strains re-isolated from the root interior of rice seedlings grown in gnotobiotic tube culture in Hoagland liquid
| Bacterial isolates | IAA production (μg mL−1) | Siderophore production | ACC deaminase activity (OD 540 nm) | Phosphate solubilization | HCN production |
|---|---|---|---|---|---|
| REN1 | 13.28 ± 0.3 | ++ | 0.73 ± 0.03 | − | + |
| REN10 | 13.19 ± 0.2 | + | 0.43 ± 0.05 | − | − |
| REN11 | 12.72 ± 1.8 | +++ | 0.52 ± 0.06 | − | − |
| REN13 | 16.06 ± 0.3 | +++ | 0.46 ± 0.04 | − | − |
| REN21 | 11.65 ± 0.7 | − | 0.51 ± 0.02 | − | − |
| REN42 | 14.60 ± 0.5 | ++ | 0.43 ± 0.02 | + | − |
| REN50 | 17.86 ± 0.3 | − | 0.65 ± 0.01 | − | − |
| REN52 | 10.88 ± 0.2 | − | 0.53 ± 0.04 | + | − |
| REN33 | 14.04 ± 0.8 | − | 0.49 ± 0.05 | − | − |
| REN14 | 12.34 ± 0.3 | ++ | 0.42 ± 0.03 | − | − |
| REN19 | 13.32 ± 0.6 | − | 0.54 ± 0.02 | − | − |
| REN44 | 8.69 ± 0.3 | − | 0.61 ± 0.01 | − | − |
± shows standard deviation. The presence of an activity is indicated by + and the absence is indicated by - . Symbols: +, 1 to 3 mm; ++, 4 to 6 mm; +++, more than 6 mm diameter of halo on agar plates