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Chinese Journal of Biological Control ›› 2023, Vol. 39 ›› Issue (6): 1418-1433.DOI: 10.16409/j.cnki.2095-039x.2023.02.057

• RESEARCH REPORTS • Previous Articles     Next Articles

Optimization of Fermentation Conditions of Biocontrol Bacteria HMQ20YJ04 and Evaluation of Its Effect on Botrytis cinerea

ZHANG Jinkui1,2, XU Shengjun2,3,4, LI Jiping1,2,3,4, MA Yannan1,2, JING Zhuoqiong2,3,4, GUO Zhijie2,3,4, ZHENG Guo1,2,3,4   

  1. 1. College of Plant Protection, Gansu Agricultural University, Lanzhou 730070, China;
    2. Institute of Plant Protection, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China;
    3. Scientific Observing and Experiment Station of Crop Pests in Tianshui, Ministry of Agriculture and Rural Affairs, Gangu 741200, China;
    4. National Agricultural Experimental Station for Plant Protection at Gangu, Ministry of Agriculture and Rural Affairs, Gangu 741200, China
  • Received:2023-01-13 Online:2023-12-08 Published:2023-12-20

Abstract: Strain HMQ20YJ04 is an antagonistic bacterium isolated and screened from saline-alkali soil in Minqin, Gansu Province, which has strong antifungal activity against various plant pathogenic fungi. In order to improve the control effect of fermentation liquid, the number of viable bacteria in fermentation liquid was used as the detection index, the fermentation medium components and shake flask fermentation conditions were screened and optimized by single-factor test, orthogonal test, Plackett-Burman test and response surface method. The results showed that the optimal composition of fermentation medium were soluble starch 5 g/L, yeast extract 10 g/L, MgSO4‧7H2O 5 g/L and NaCl 5 g/L and the optimal fermentation conditions were rotation speed 200 r/min, inoculation amount 5%, temperature 32 ℃, cultivation time 60 h and initial pH 6.5. The results of pot experiments in greenhouse showed that the fermentation liquid of strain HMQ20YJ04 had a good control effect on tomato gray mold, with the control effect of 63.03%. The above results provided a basis for the research and development of Bacillus subtilis strain HMQ20YJ04 agent and its application in biological control of tomato gray mold.

Key words: Botrytis cinerea, Bacillus subtilis, orthogonal experiment design, Plackett-Burman test, response surface method

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