Table 1.
Physiological and biochemical characterization of rhizobacterial isolates.
| Characteristics | TRS-1 | TRS-3 | TRS-5 | TRS-2 | TRS-4 | TRS-7 | TRS-8 |
|---|---|---|---|---|---|---|---|
| Gram stain | +ve | +ve | +ve | +ve | +ve | +ve | +ve |
| pH optimum (range) | 7.0 (6.5–8.0) | 7.0 (7.5–8.0) | 6.0 (7.0–8.5) | 7.0 (5.0–8.0) | 7.0 (6.0–8.0) | 7.0 (7.0–8.5) | 7.0 (7.0–8.5) |
| Temperature optimum (range) °C | 30 (30–40) | 30 (28–40) | 30 (30–40) | 37 (28–45) | 37 (28–45) | 28 (28–40) | 28 (28–40) |
| Motility | Motile | Motile | Motile | Motile | Motile | Non- motile | Non- motile |
| Nature |
Facultative Anaerobic |
Aerobic |
Aerobic |
Aerobic |
Aerobic |
Aerobic |
Aerobic |
|
Biochemical tests | |||||||
| Indole test | - | - | - | - | - | - | - |
| Methyl red test | + | - | - | - | - | - | - |
| Voges Proskauer test | + | + | + | + | + | + | + |
| Starch hydrolysis | + | + | - | - | - | + | + |
| H2S production test | + | - | - | - | - | - | - |
| Catalase test | + | + | + | + | + | + | + |
| Glucose utilization | + | + | + | + | + | + | + |
Physiological and biochemical characterization of rhizobacterial isolates was carried out under identical conditions. ‘+’, positive; ‘-’, negative result for the test.