河南农业科学 ›› 2023, Vol. 52 ›› Issue (5): 121-129.DOI: 10.15933/j.cnki.1004-3268.2023.05.014

• 植物保护 • 上一篇    下一篇

小麦茎基腐病拮抗菌发酵条件优化及稳定性评价

张强,吴利民,李朋燕,赵娜,户申奥,陆宁海   

  1. (河南科技学院资源与环境学院,河南 新乡 453003)
  • 收稿日期:2022-10-12 出版日期:2023-05-15 发布日期:2023-06-09
  • 通讯作者: 陆宁海(1976−),男,甘肃宁县人,副教授,博士,主要从事植物病害生物防治研究。E-mail:gsninghai@163.com
  • 作者简介:张强(1986−),男,甘肃陇西人,讲师,博士,主要从事植物病害生物防治研究。E-mail:zhangqiang4503@163.com
  • 基金资助:
    国家重点研发计划项目(2017YFD021704);河南省科技攻关项目(212102110146)

Optimization of Fermentation Conditions and Stability Evaluation of Antagonistic Bacteria against Wheat Crown Rot

ZHANG Qiang,WU Limin,LI Pengyan,ZHAO Na,HU Shen’ao,LU Ninghai   

  1. (School of Resources and Environment,Henan Institute of Science and Technology,Xinxiang 453003,China)
  • Received:2022-10-12 Published:2023-05-15 Online:2023-06-09

摘要: :为探究解淀粉芽孢杆菌(Bacillus amyloliquefaciens)HB-081 对小麦茎基腐病原假禾谷镰刀菌(Fusarium pseudograminearum)的生防活性,采用单因素试验和正交试验对菌株HB-081发酵条件进行优化,对无菌发酵液的稳定性进行分析,并通过盆栽试验测定菌株HB-081的生防效果。结果表明,菌株HB-081最适培养基配方为麦芽糖10.0 g/L、蛋白胨15.0 g/L、氯化钾5.0 g/L;最适发酵初始pH值为6、温度为28~32 ℃、装液量为50~75 mL、接种量为2%~4%、发酵时间为48 h。无菌发酵液可以耐受100℃高温,紫外线照射180 min抑菌活性不受影响,不耐强酸和强碱,不受胃蛋白酶、胰蛋白酶及蛋白酶K的影响。通过PCR检测发现,该菌株具有脂肽类物质合成基因bacAB 和fenB。盆栽试验结果表明,优化后的菌株HB-081发酵液对小麦茎基腐病的防治效果为69.74%,高于原始发酵液的防治效果(64.31%)。

关键词: 小麦茎基腐病, 拮抗菌, 假禾谷镰刀菌, 解淀粉芽孢杆菌, 发酵条件优化, 稳定性, 生物防治

Abstract: In order to determine the antifungal activity of Bacillus amyloliquefaciens strain HB‐081 against Fusarium pseudograminearum,the fermentation conditions were optimized by single factor test and orthogonal test,the mycelial growth rate method was used to analyze the stability of the cell‐free fermentation broth and the control effect of strain HB‐081 was measured by pot experiment.The optimized medium composition was maltose 10.0 g/L,peptone 15.0 g/L,KCl 5.0 g/L.The optimal fermentation conditions were as follows:initial pH 6,temperature 28—32℃,liquid volume 50—75 mL,inoculation amount 2%—4%,culture time 48 h.The antifungal activity of cell‐free fermentation broth were free from 100℃,ultraviolet light for 180 min,pepsin,trypsin,and proteinase K.However,the cell‐free fermentation broth were not resistant to strong acid and alkali.Two biosynthetic genes of lipopeptide,bacAB and fenB were detected by using PCR.Pot experiment showed that the control efficacy of strain HB‐081 optimized fermentation broth on wheat crown rot was 69.74%,which was higher than the control efficacy(64.31%)of original fermentation broth.

Key words: Wheat crown rot, Antagonistic bacteria, Fusarium pseudograminearum, Bacillus amyloliquefaciens, Optimization of fermentation conditions, Stability, Biological control

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