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Chinese Journal of Biological Control ›› 2024, Vol. 40 ›› Issue (5): 1128-1134.DOI: 10.16409/j.cnki.2095-039x.2024.02.032

• RESEARCH REPORTS • Previous Articles    

Metabolite of Symbiotic Bacteria from Steinernema feltiae SRP 18-91 and Their Antibacterial Activity

ZHANG Jinhua1, TIAN Chengli1, SU Lanqi2, SUN Hui1, DING Yan1, LI Maohai1, LI Li1   

  1. 1. Institute of Plant Protection, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Gongzhuling 136100, China;
    2. Collage of Plant Protection, Jilin Agricultural University, Changchun 130000, China
  • Received:2023-12-06 Published:2024-10-11

Abstract: This study aimed to determine the inhibitory effect of the fermentation broth of symbiotic bacteria from Steinernema feltiae SRP 18-91 on 5 plantpathogenic fungi by mycelial growth. The results suggested that the Colletotrichum fragariae Brooks and Phytophthora sojae Kaufmann & Gedemann had high sensitivity to broth, with inhibitory rates of 96.8% and 90.8%, respectively. Maximum effectiveness of fermentation broth against Heterodera glycines Ichinohe was 61.47% in soybean pot culture experiment. The symbiotic bacteria of S. feltiae SRP 18-91 was identified to be a Xenrohabdus bovineii SRP 18-91 by 16S rRNA sequence analysis. Further study showed that the major compounds of the liquid extract from symbiotic bacteria were triterpenoid, valerate metabolites, pentamycin, hydroxyquinoline, and amino acid compound by LC/MS. The abundance of 8-hydroxyquinoline was the highest in all the components.

Key words: entomopathogenic nematode, symbiotic bacterium, metabolic product, antifungal activity

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