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The study was aimed to explore the resistance to Colletotrichum siamense, dominant specie of rubber tree induced by Burkholderia arboris DHR18. The enzyme activity changes on the treatments of different concentrations of DHR18 fermentation broth and co-treatments of DHR18 with C. siamense CH-1 using rubber clone GT1 were studied. Five defensive enzymes including catalase (CAT), peroxidase (POD), phenylalanin ammonialyase (PAL), and superoxide dismutase (SOD) were assayed. Results indicated that treatments with 1×108 CFU/mL, 1×107 CFU/mL, 1×106 CFU/mL of DHR18 fermentation broth showed significant higher activities of CAT, POD, PAL, SOD and PPO in rubber leaves compared to the control group. The enzyme activities with broth concentration 1×107 CFU/mL were the highest. The activity peak of the five enzymes was 1 009.14, 29 138.67, 110.24, 902.42 and 148.00 U/g, respectively, which was 2.68, 3.35, 1.88, 3.97 and 4.51 times of the control group, respectively. Under the co-treatments of B. arboris DHR18 and C. siamense CH-1, treatment group inoculated with DHR18 fermentation broth before inoculated with CH-1, the enzyme activities were higher than other co-treatment groups, and significantly higher than that of the control group. Activity peak of CAT, POD, PAL, SOD and PPO was 1 230.85, 45 504.67, 117.53, 1 342.17 and 134.40 U/g, respectively. They were 4.56, 3.10, 2.04, 3.28 and 5.98 times that of the control group, respectively; The plate inhibition rate of strain DHR18 against C. siamense was 71.56%, the preventive effect against C. siamense on rubber saplings was 81.79%, and the control effect was 44.35%. The results showed that Burkholderia arboris DHR18 could promote the activity of defense-related enzymes in rubber trees and induce systemic resistance in rubber trees. The induced resistance may be one of the reasons for the control of C. siamense by B. arboris DHR18.
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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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