Table 1.
Reduction of wilt severity on tomato seedling pre-treated with high-molecular weight metabolites (HMWM) isolated from biocontrol Fusarium oxysporum strain CS-20.
| Concentrations of HMWM eluted from Sephadex G-50, μg/ml | Days after root inoculation |
|||
|---|---|---|---|---|
| 15 |
21 |
|||
| Average wilt severity index | Wilt severity reduction respective to control, % | Average wilt severity index | Wilt severity reduction respective to control, % | |
| 200 | 0.7c | 81 | 2.0b | 49 |
| 50 | 2.0b | 44 | 3.6a | 8 |
| 10 | 2.5b | 31 | 3.5a | 10 |
| 5 | 3.5a | 3 | 3.8a | 3 |
| 0∗ | 3.6a | - | 3.9a | - |
| 200 + 100°C, 15 min | 3.6a | 0 | 3.8a | 0 |
∗No pre-incubation in HMWM prior to inoculation with the pathogen; seedlings were immersed in sterile double distilled water. Results represent means values calculated from means obtained in each of five experiments. Numbers within the columns denoted with different lower case letters differ from each other at P ≤ 0.05.