北方农业学报 ›› 2025, Vol. 53 ›› Issue (5): 57-66.doi: 10.12190/j.issn.2096-1197.2025.05.06

• 种质资源·植物保护 • 上一篇    下一篇

嗜线虫沙雷氏菌对小菜蛾高毒力菌株的筛选及毒力测定

许超莹1, 杨超凡1, 宋萍1, 李鑫2, 南宫自艳1   

  1. 1.河北农业大学 植物保护学院,河北 保定 071000;
    2.湖南省微生物所,湖南 长沙 410125
  • 收稿日期:2025-05-23 出版日期:2025-10-20 发布日期:2026-01-20
  • 通讯作者: 南宫自艳(1976—),女,副教授,博士,主要从事害虫生物防治与分子生物学方面的研究工作。 李 鑫(1989—),男,副研究员,博士,主要从事蔬菜病虫害绿色防控方面的研究工作。
  • 作者简介:许超莹(2002—),男,硕士研究生,研究方向为害虫生防微生物的研究应用。
  • 基金资助:
    湖南省重点研发计划项目(2023NK2030); 湖南省农业科技创新资金项目(2024CX115)

Screening and virulence determination of highly virulent strains of Serratia nematodiphila against Plutella xylostella

XU Chaoying1, YANG Chaofan1, SONG Ping1, LI Xin2, NANGONG Ziyan1   

  1. 1. College of Plant Protection,Hebei Agricultural University,Baoding 071000,China;
    2. Hunan Institute of Microbiology,Changsha 410125,China
  • Received:2025-05-23 Online:2025-10-20 Published:2026-01-20

摘要: 【目的】 筛选针对小菜蛾(Plutella xylostella)的高效微生物生防菌株。【方法】 对嗜线虫沙雷氏菌(Serratia nematodiphila)FQ268、LJ232、YC310、YC278菌株进行生理生化测定;采用浸叶法筛选高活性菌株,然后对其进行抗生素敏感性试验和小菜蛾杀虫毒力测定。【结果】 4个嗜线虫沙雷氏菌菌株均为革兰氏阴性菌;甲基红试验、吲哚试验、纤维素降解试验和解脂活性试验结果均为阴性,过氧化氢酶试验和柠檬酸利用试验结果均为阳性;4个菌株均能利用葡萄糖和甘露醇产酸,不能利用果糖和肌醇。筛选得到的高活性菌株为嗜线虫沙雷氏菌FQ268,其对头孢曲松、硫酸庆大霉素和诺氟沙星敏感,对利福平、头孢拉定、青霉素、红霉素、四环素具有耐药性。嗜线虫沙雷氏菌FQ268发酵液(5.58×109 CFU/mL)对小菜蛾2龄幼虫48和72 h的LC50分别为1.742×109和2.566×107 CFU/mL。【结论】 嗜线虫沙雷氏菌FQ268对小菜蛾2龄幼虫有较高的杀虫活性,是较为高效的微生物生防菌株。

关键词: 嗜线虫沙雷氏菌, 小菜蛾, 菌株筛选, 毒力测定

Abstract: 【Objective】 To screen highly effective microbial biocontrol strains against Plutella xylostella.【Methods】 The strains of Serratia nematodiphila(FQ268,LJ232,YC310,and YC278) were subjected to physiological and biochemical characterization. High-activity strains were screened using the leaf-dip method,followed by antibiotic susceptibility testing and insecticidal virulence determination against P. xylostella.【Results】 All four S. nematodiphila strains were Gram-negative. The methyl red test,indole test,cellulose degradation test,and lipase activity test were negative,while the catalase test and citrate utilization test were positive. All four strains could utilize glucose and mannitol to produce acid but could not utilize fructose and inositol. The high-activity strain identified was S. nematodiphila FQ268,which was susceptible to ceftriaxone,gentamicin sulfate,and norfloxacin,but resistant to rifampicin,cefradine,penicillin,erythromycin,and tetracycline. The fermentation broth of S. nematodiphila FQ268(5.58×109 CFU/mL) exhibited LC50 values of 1.742×109 and 2.566×107 CFU/mL against second-instar larvae of P. xylostella at 48 and 72 h,respectively.【Conclusion】 S. nematodiphila FQ268 shows high insecticidal activity against second-instar larvae of P. xylostella and represents a relatively efficient microbial biocontrol strain.

Key words: Serratia nematodiphila, Plutella xylostella, Strain screening, Virulence determination

中图分类号: 

  • S476.11