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Banana is an important economic crop in the subtropical region of China. The occurrence of banana Fusarium wilt has seriously hindered the development of banana industry in recent years. Biological control has attracted attention because of its green environmental protection and durable disease resistance. It’s very important to get the efficient biocontrol strains with different inhibition mechanisms on banana Fusarium wilt. In this study, four different types of biocontrol strains against banana Fusarium wilt which were obtained in the laboratory in the early stage were mutated by ultraviolet-nitrite compound mutagenesis, with the highest antimicrobial activity increased by 186.24% and the highest control effect increased by 46.54%. The disease prevention mechanism of the four mutants obtained was preliminarily investigated. The results showed that the strain Ba62v had the highest inhibition rate on the colony growth of Fusarium oxysporum f. sp. cubense (Foc), and could also induce the activity of SOD enzyme in banana seedlings. The strain Blz02v could promote the growth of banana seedlings and induce the activities of POD and SOD of banana seedlings. The strain Bc11v had the highest inhibition rate on the spore germination of Foc, and could induce the activities of PPO, CAT and SOD in banana seedlings. The strain Pt05v had the highest inhibition rate on the sporulation of Foc, and could induce the activities of POD, PPO and SOD in banana seedlings. The main action mechanisms of the four biocontrol mutants on Foc and hosts are different, and there is a potential for biocontrol of compound synergism, which would provide an important strain resource for the development and utilization of the disease-resistant compound fungicides in the future, and has a good application prospect.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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