Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (1): 50-57.DOI: 10.3969/j.issn.1004-1524.2023.01.06

• Animal Science • Previous Articles     Next Articles

Study on antibacterial and quorum quenching activity of a Pseudoalteromonas sp. DL3

ZHAO Saisai1(), ZHANG Haojie1, CAI Xiulei1, WANG Lirong2, SHEN Xiaoran2, CAO Zhi1, SHAN Hu1()   

  1. 1. College of Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, Shandong, China
    2. Shandong Bilan Biotechnology Co., Ltd., Tai’an 271411, Shandong, China
  • Received:2022-05-24 Online:2023-01-25 Published:2023-02-21

Abstract:

In this study, a strain DL3 was isolated from the microbial mucous membrane of antifouling attached steel sheet in aquaculture ponds. In order to clarify the activity of this strain and its potential application as beneficial bacteria, it was preliminarily identified by bacterial isolation culture, 16S rRNA sequencing and phylogenetic analysis. Oxford cup method and plate method were used to determine the bacteriostatic activity and quorum quenching activity. Based on phylogenetic analysis of the 16S rRNA gene sequence of strain DL3, this strain had the highest similarity with Pseudoalteromonas peptidolytica NBRC 101021T, with the closest affinity of 99.64%. The bacteriostasis test showed that the strain could significantly inhibit the growth of V. anguillarum and Pseudomonas aeruginosa, and showed that could inhibit the growth of Staphylococcus aureus, Escherichi coli, Salmonella, Streptococcus, Shigella, V. fluvialis, V. orientalis, V. harveyi and Bacillus pumilus to different degrees, and the antibacterial activity was strongest when cultured till 72 h. From the results of plate test, the strain DL3 had quorum quenching activity and could quench signal molecules such as 3-OXO-C6-HSL, C10-HSL, C12-HSL and 3-OXO-C14-HSL. In this study, the strain DL3 was successfully isolated and its antagonistic activity against pathogenic bacteria was clarified, which laid a foundation for further studies on the antibacterial mechanism of strain DL3 and its active products and the application of marine microorganisms in the prevention and control of animal bacterial diseases.

Key words: Pseudoalteromonas, antibacterial activity, quorum quenching

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