Abstract:

In order to research the inducible resistance mechanism of marine biocontrol bacteria TC-1 against the banana vasicular wilt in the potted trial. The inducible resistance function of TC-1 was explored by comparing the differences of five defense enzymes activities of banana seedling, which were treated via four methods. No treatment was given in normal control group, inducing with fermentation broth of TC-1, inoculating with spore suspension of Fusarium oxysporum f. sp. cubense race 4 (FOC4), inducing after inoculating with spore suspension of FOC4. The results showed that there were no significant differences on the five kinds of defense enzymes activities in unvaccinated bananas between banana seedlings treated with marine bacteria TC-1 and seedlings with untreated (P>0.05). The five kinds of defense enzymes activities were significantly induced in the banana seedlings inoculated FOC4 after treated with TC-1. The activities of POD and PPO in leaf were respectively increased 248% and 12% at 6 day after treatment (DAT); the activities of PAL and SOD were respectively increased 16% and 10% at 9 DAT. The activity of CAT was respectively increased 363% at 12 DAT simultaneously,, compared to untreated plant. It was concluded that strain TC-1 could played an important role on induction disease resistance to FOC4 by increasing activities of CAT, POD PPO, PAL and SOD in banana plant.