TABLE 1.
Growth-promoting characteristics of isolatesa
| Isolateb | Antagonistic effect (diam of zone of inhibition [mm])c | Phosphate solubilization efficiency (%) | Chitinase enzyme activity (%) | IAA production (mg/liter) |
|---|---|---|---|---|
| ABS6 | 5.3 ± 0.1 d | 55.7 ± 0.0 e | 13.7 ± 0.5 h | 2.0 ± 0.0 h |
| ADS14* | 7.6 ± 0.1 b | 62.3 ± 0.1 b | 45.6 ± 0.1 b | 10.1 ± 0.0 a |
| AKR5 | 2.0 ± 0.0 e | 38.3 ± 0.2 j | 1.4 ± 0.0 j | 2.2 ± 0.1 h |
| AT-IKS | 1.1 ± 0.0 f | 22.9 ± 0.8 m | 1.7 ± 0.0 j | 7.4 ± 0.2 b |
| AT-ILR | 2.2 ± 0.0 e | 37.4 ± 0.3 j | 2.1 ± 0.0 j | 4.8 ± 0.0 f |
| AT-SKR | 1.1 ± 0.0 f | 29.5 ± 0.3 l | 1.2 ± 0.1 j | 1.6 ± 0.2 i |
| EBS8* | 10.6 ± 0.0 a | 69.5 ± 0.4 a | 42.2 ± 0.2 c | 5.5 ± 0.2 e |
| EPR2* | 7.5 ± 0.3 b | 61.9 ± 0.0 b | 69.6 ± 0.0 a | 6.3 ± 0.1 d |
| EPR3 | 1.6 ± 0.5 ef | 0.0 ± 0.0 n | 0.0 ± 0.0 j | 1.1 ± 0.1 i |
| EPR4 | 5.2 ± 0.0 d | 60.4 ± 0.4 c | 26.7 ± 0.2 f | 6.1 ± 0.0 d |
| EPR7 | 2.1 ± 0.0 e | 31.1 ± 0.0 k | 13.8 ± 0.8 h | 5.4 ± 0.2 e |
| IBS8 | 5.1 ± 0.0 d | 52.4 ± 0.2 f | 35.1 ± 2.9 d | 4.7 ± 0.0 f |
| IGBR11* | 7.4 ± 0.3 b | 62.0 ± 0.0 b | 41.4 ± 0.4 c | 7.2 ± 0.0 b |
| IGGR11 | 6.2 ± 0.0 c | 57.6 ± 0.2 d | 20.3 ± 0.0 g | 6.4 ± 0.0 cd |
| ILS13 | 6.7 ± 0.2 c | 44.9 ± 0.7 g | 20.6 ± 0.1 g | 6.8 ± 0.0 bc |
| IPR1 | 5.1 ± 0.0 d | 41.8 ± 0.8 hi | 11.1 ± 0.0 i | 6.5 ± 0.0 cd |
| OSR7 | 5.3 ± 0.2 d | 40.7 ± 0.4 i | 31.8 ± 0.0 e | 2.6 ± 0.2 h |
| TDS9 | 5.3 ± 0.2 d | 42.3 ± 0.1 h | 14.7 ± 0.0 h | 5.8 ± 0.0 de |
| UNS9 | 5.4 ± 0.2 d | 55.2 ± 0.4 e | 21.3 ± 0.1 g | 3.6 ± 0.4 g |
| None | 0.0 ± 0.0 g | 0.0 ± 0.0 n | 0.0 ± 0.0 j | 0.0 ± 0.0 j |
a
Three isolates were used for testing IAA production and five for the other assays. Values are means ± standard deviations. Values followed by different letters within a column indicate significant differences according to the Student-Newman-Keuls multiple-range test (α = 0.05).
b
Isolates followed by an asterisk were chosen for further characterization.
c
In vitro antagonistic effect against F. verticillioides.