浙江农业学报 ›› 2025, Vol. 37 ›› Issue (12): 2563-2573.DOI: 10.3969/j.issn.1004-1524.20240710

• 植物保护 • 上一篇    下一篇

枯草芽孢杆菌沙漠亚种kc-16培养条件的优化

杨学宇1,2(), 牛丽1, 谭琳3, 邓玉莲1, 包强4,*(), 胡秋龙1,*()   

  1. 1.湖南农业大学 园艺学院,湖南 长沙 410128
    2.湖南省烟草公司郴州市公司,湖南 郴州 423000
    3.湖南农业大学 植物保护学院,湖南 长沙 410128
    4.湖南省农业科学院 茶叶研究所,湖南 长沙 410125
  • 收稿日期:2024-08-06 出版日期:2025-12-25 发布日期:2026-01-09
  • 作者简介:杨学宇(1998—),男,山西大同人,硕士,从事茶树病虫害生物防治研究。E-mail:1743501922@qq.com
  • 通讯作者: *包强,E-mail:baoqiang0703@126.com;胡秋龙,E-mail:huqiulongnet@126.com
  • 基金资助:
    湖南省重点研发计划(2022NK2051);湖南省重点研发计划(2023NK2013);湖南省科技创新重大项目(2021NK1020);国家重点研发计划项目(2022YFD1600800)

Optimization of the culture conditions of Bacillus subtilis subsp. inaquosorum kc-16

YANG Xueyu1,2(), NIU Li1, TAN Lin3, DENG Yulian1, BAO Qiang4,*(), HU Qiulong1,*()   

  1. 1. College of Horticulture, Hunan Agricultural University, Changsha 410128, China
    2. Chenzhou Branch of Hunan Tobacco Company, Chenzhou 423000, Hunan, China
    3. College of Plant Protection, Hunan Agricultural University, Changsha 410128, China
    4. Tea Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China
  • Received:2024-08-06 Online:2025-12-25 Published:2026-01-09

摘要: 为优化枯草芽孢杆菌沙漠亚种(Bacillus subtilis subsp. inaquosorum)菌株kc-16的培养条件,提高其生物量与抑菌活性,本研究通过单因素试验初步筛选最适碳源、氮源、无机盐种类及其对应的质量分数范围,进一步采用Plackett-Burman试验确定影响菌液D600(600 nm处的吸光度)的关键因子。在此基础上,以菌液D600为响应值,通过Box-Behnken设计构建显著因子与生物量的非线性方程,预测并验证菌株kc-16的最佳培养条件。结果表明,最优培养基组分(质量分数)为0.5%乳糖、4.0%蛋白胨、0.1%硫酸镁、0.6%氯化钠、0.2%碳酸钙;培养条件为转速200 r·min-1、初始pH值7.7、温度30 ℃、接种量0.6%(体积比)。在此条件下,模型预测的发酵液D600为0.112,实测值为0.307,二者吻合较好。平板计数法结果显示,优化后的活菌数为6.7×109 CFU·mL-1,是优化前(4.0×108 CFU·mL-1)的16.75倍。本研究通过单因素试验结合响应面法实现了菌株kc-16培养条件的优化,为该菌株的规模化生产与应用提供支持。

关键词: 枯草芽孢杆菌沙漠亚种, 培养基, 响应面法, 发酵优化

Abstract:

This study aimed to optimize the culture conditions of Bacillus subtilis subsp. inaquosorum kc-16 to enhance its biomass and antimicrobial activity. The optimal carbon source, nitrogen source, types of inorganic salts, and their corresponding mass fraction ranges were preliminarily screened by single-factor experiments. Subsequently, the Plackett-Burman experiment was performed based on the D600 (absorbance at 600 nm) as an important factor from the single-factor screening results, a non-linear equation between significant factors and biomass was fitted and solved with Box-Behnken Design to predict the optimal culture conditions for strain kc-16, and the predicted results were validated. Results showed that the optimized culture medium components (mass fraction) were determined to be 0.5% lactose, 4.0% peptone, 0.1% magnesium sulfate, 0.6% sodium chloride, and 0.2% calcium carbonate. The optimal culture conditions were identified as 200 r·min-1 agitation speed, initial pH value of 7.7, temperature of 30 ℃, and inoculation amount of 0.6%. Under these conditions, the model predicted an D600 value of 0.112, which closely matched with the validated value of 0.307. Plate count results indicated that the viable cell count after optimization reached 6.7×109 CFU·mL-1, which was 16.75 times that the initial count (4.0×108 CFU·mL-1). This study achieved optimized culture conditions for strain kc-16 through a combination of single-factor experiments and response surface methodology, providing support for its large-scale production and application.

Key words: Bacillus subtilis subsp. inaquosorum, culture medium, response surface methodology, fermentation optimization

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