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中国生物防治学报 ›› 2024, Vol. 40 ›› Issue (2): 424-434.DOI: 10.16409/j.cnki.2095-039x.2024.02.005

• 研究论文 • 上一篇    

生防菌Y26的鉴定、发酵优化及其杀线虫活性测定

梅凤珍1, 周明超1, 杨丹1, 李香风5, 孔令安3, 刘建斌4, 史凤玉1,2   

  1. 1. 河北科技师范学院农学与生物科技学院, 昌黎 066004;
    2. 河北科技师范学院河北省作物逆境生物学重点实验室, 昌黎 066004;
    3. 中国农业科学院植物保护研究所/植物病虫害生物学国家重点实验室, 北京 100193;
    4. 北京市农林科学院植物营养与资源环境研究所, 北京 100097;
    5. 河北省邯郸市园林局, 邯郸 056000
  • 收稿日期:2023-09-01 发布日期:2024-04-28
  • 通讯作者: 史凤玉,副教授,E-mail:shify2021@163.com。
  • 作者简介:梅凤珍,女,硕士研究生,E-mail:386631317@qq.com。
  • 基金资助:
    河北省重点研发计划项目( 21326502D);植物病虫害生物学国家重点实验室开放基金( SKL0F202115)

Identification,Fermentation Optimization and Determination of Nematicidal Activity of Biocontrol Bacterium Y26

MEI Fengzhen1, ZHOU Mingchao1, YANG Dan1, LI Xiangfeng5, KONG Lingan3, LIU Jianbin4, SHI Fengyu1,2   

  1. 1. College of Agronomy and Biotechnology, Hebei Normal University of Science and Technology, Changli 066004, China;
    2. Key Laboratory of crop stress biology, Hebei Normal University of Science and technology, Changli 066004, China;
    3. State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    4. Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China;
    5. Handan Garden Bureau of Hebei Province, Handan 056000, China
  • Received:2023-09-01 Published:2024-04-28

摘要: 为防治黄瓜根结线虫病,本实验室前期从黄瓜根际土壤分离出的一株细菌Y26,测定其发酵液对根结线虫的生物活性,经发酵液处理后的根结线虫校正死亡率为95.12%,卵孵化的相对抑制率为83.51%,故菌株Y26可作为根结线虫生防菌资源;通过形态学观察及分子生物学方法鉴定菌株Y26为短小芽胞杆菌Bacillus pumilus;通过Plackett-Burma法和响应面分析试验得到菌株Y26发酵优化的条件是:玉米粉2.14%,豆饼粉3%,K2HPO4 0.57%,MgSO4·7H2O 0.21%,种龄12 h,pH为7.2,接种量2%,培养温度28℃,装瓶量为50 mL/250 mL,发酵优化后,菌液中芽胞浓度提高25.69%,10%发酵液对根结线虫的校正死亡率从优化前的78.03%提高到93.32%。研究结果表明,经发酵优化后的Y26菌液杀线虫活性显著提高,可作为杀线生物菌剂开发应用。

关键词: 根结线虫, 短小芽胞杆菌, 鉴定, 发酵条件优化

Abstract: To control the root-knot nematode disease in cucumber,a bacterial strain Y26 was isolated from cucumber rhizosphere soil in the laboratory.Bio-activity of fermentation broth against root-knot nematodes was determined.The corrected mortality rate of the second-stage juveniles treated with fermentation broth for 24 hours was 95.12%,and the relative inhibition rate of eggs hatching reached 83.51% after 48 hours of fermentation broth treatment,so strain Y26 can be used as a bacterial control resource for root-knot nematodes disease.Strain Y26 was identified as Bacillus pumilus by morphological observation and molecular identification.The optimized conditions for fermentation of strain Y26 by Plackett-Burma design and response surface analysis were corn flour 2.14%,bean cake flour 3%,K2HPO4 0.57%,MgSO4·7H2O 0.21%,cultural time 12 hours,pH 7.2,inoculation amount 2%,cultural temperature 28℃,and the media amount was 50 mL/250 mL.After fermentation optimization,the spore concentration was increased by 25.69%,the corrected mortality rate of 10% fermentation broth increased from 78.03% to 93.32% before optimization.The results showed that the activity of optimized Y26 fermentation broth root-knot nematodes was significantly increased and could be developed and applicated as a biological nematicide.

Key words: root-knot nematode, Bacillus pumilus, identification, optimization of fermentation conditions

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