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journal1 ›› 2016, Vol. 32 ›› Issue (6): 767-774.DOI: 10.16409/j.cnki.2095-039x.2016.06.014

• RESEARCH REPORTS • Previous Articles     Next Articles

Compound Mutation of Brevibacillus brevis Strain Bb5911 and Its Control Effect on Banana Anthracnose

DU Chanjuan1, FU Gang1, PAN Lianfu1, YE Yunfeng2, ZHANG Jin1, YANG Di1, SUN Jian3   

  1. 1. Institute of Microbiology Research, Guangxi Academy of Agricultural Sciences, Nanning 530007, China;
    2. Institute of Horticultural Research, Guangxi Academy of Agricultural Sciences, Nanning 530007, China;
    3. Institute of Agro-products Processing and Technology, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
  • Received:2016-04-22 Online:2016-12-08 Published:2016-12-07

Abstract: In this study, the antagonist Brevibacillus brevis strain Bb5911 was mutated by UV-NaNO2 compound in order to improve the antifungal activity against banana anthracnose. In addition, the control effects of the mixture of this strain and prochloraz were tested for investigating its feasibility mixed with fungicide. The results showed that, the optimum mutation condition was irradiated 15 s under 20 W UV lamps at the distance of 50 cm, and then treated 60 min with 300 mmol/L NaNO2. After twice mutations, the strongest antifungal strain 5B37-3 was selected out. Its antifungal activity was 112.41% higher than that of the original strain. The minimal inhibitory concentration (MIC) of prochloraz against strain 5B37-3 was 20.83 μg/mL. The antifungal activity of strain 5B37-3 was not reduced significantly after transferring 7 times continuously. The results of inhibition spectrum test showed that the antifungal activity of strain 5B37-3 against 13 plant pathogens were all higher than that of the original strain, with the increase rate from 18.20% to 239.27%. Furthermore, the control efficiency of strain 5B37-3 on banana anthracnose was 66.55%, which was significantly higher than that of the original strain. After 15 days storage, the control efficiency of the mixture of strain 5B37-3 and 10.42 μg/mL prochloraz was 72.76%, which was similar to the 333.33 μg/mL prochloraz. But after 17 days storage, it showed lower than that of 333.33 μg/mL prochloraz significantly.

Key words: Brevibacillus brevis, compound mutation, banana anthracnose, control effect

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