Table 3.
Plant growth promoting traits of the selected rhizospheric actinomycetes under in-vitro conditions.
| Strains | Phosphate solubilization | ACCb deaminase concentration (mmol/l) | Ammonia production | HCNc production | Siderophore production | |
|---|---|---|---|---|---|---|
| SIa | Soluble P concentration (mg/100 ml) | |||||
| WA-1 | 2.33 | 72.13 ± 0.336 | 1.65 ± 0.42 d | + | + | + |
| WA-3 | 2.22 | 66.0 ± 0.40 | 1.29 ± 0.45 b | + | + | + |
| WC-3 | 2.20 | 61.46 ± 0.279 | 1.59 ± 0.38 c | + | + | + |
| WD-3 | 2.21 | 57.83 ± 0.32 | 1.9 ± 0.35 f | + | + | + |
| TA-3 | 2.25 | 62.9 ± 0.40 | 0.71 ± 0.16 a | + | + | + |
| TB-4 | 2.27 | 70.36 ± 0.33 | 1.81 ± 0.39 e | + | + | + |
a
SI, Solubilization index = the ratio of the total diameter (colony + halo zone) to the colony diameter.
b
ACC, 1-aminocyclopropane-1-carboxylate (ACC) deaminase. Different letters on bars indicate significant difference between treatments, using Duncan's multiple range test (P = 0.05).
c
HCN, Hydrogen cyanide. The symbol, + represents the positive reaction/presence of trait while symbol, − represents the negative reaction/absence of trait.