热带海洋学报 ›› 2023, Vol. 42 ›› Issue (3): 158-168.doi: 10.11978/2022142CSTR: 32234.14.2022142

• 海洋生物学 • 上一篇    下一篇

广西北部湾可培养黏细菌资源初探及其抗菌活性研究

卢天梅1(), 官佳松1,2, 覃诗敬1, 刘永宏1,3, 苏志维1()   

  1. 1.广西中医药大学海洋药物研究院, 广西 南宁 530200
    2.广西大学农学院, 广西 南宁 530004
    3.热带海洋生物资源与生态重点实验室(中国科学院南海海洋研究所), 广东省海洋药物重点实验室, 广东 广州 510301
  • 收稿日期:2022-06-23 修回日期:2022-08-24 出版日期:2023-05-10 发布日期:2022-09-01
  • 作者简介:

    卢天梅(1994—), 女, 广西壮族自治区桂平市人, 硕士研究生, 从事海洋药用微生物资源挖掘与利用研究。email:

  • 基金资助:
    广西中医药大学海洋药物研究院团队科研专项经费(2018ZD005-A08); 国家自然科学基金(32060098); 广西八桂学者专项经费(05019055); 广西中医药大学研究生教育创新计划项目(YCSZ2022024); 大学生创新项目(S202110600122); 广西科技计划项目(桂科AB19259010)

Preliminary study on the culturable myxobacteria resources from the Beibu Gulf, Guangxi and their antibacterial activity

LU Tianmei1(), GUAN jiasong1,2, QIN Shijing1, LIU Yonghong1,3, SU Zhiwei1()   

  1. 1. Institute of Marine Drugs, Guangxi University of Chinese Medicine, Nanning 530200, China
    2. College of Agriculture, Guangxi University, Nanning 530004, China
    3. Key Laboratory of Tropical Marine Bio-resources and Ecology (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangdong Key Laboratory of Marine Materia Medica, Guangzhou 510301, China
  • Received:2022-06-23 Revised:2022-08-24 Online:2023-05-10 Published:2022-09-01
  • Supported by:
    Scientific Research Foundation of Institute of Marine Drugs, GUCM(2018ZD005-A08); National Natural Science Foundation of China(32060098); Special Fund for Bagui Scholars to Yonghong Liu(05019055); Innovation Project of Guangxi Graduate Education of GXUCM(YCSZ2022024); University Student Innovation Project(S202110600122); Natural Science Foundation of Guangxi Zhuang Autonomous Region(AB19259010)

摘要:

采用大肠杆菌诱导法和滤纸诱导法对广西北部湾不同海洋生境采集的样品进行黏细菌的分离纯化, 基于菌落形态特征结合16S rRNA基因序列分析对黏细菌纯培养物进行初步鉴定。从21份海洋生境样品中共分离纯化得到38株黏细菌, 隶属于4属10种, 其中黏球菌属和珊瑚球菌属分别占菌株总数的63.16%和26.32%, 属于优势菌属。采用VY/2培养基进行固体培养发酵, 利用丙酮提取浓缩获得提取物, 进一步利用滤纸片琼脂扩散法对菌株粗提物进行抗菌活性初步筛选。结果发现24株黏细菌提取物对9种指示菌具有不同程度的抑制作用, 抗菌阳性率达63.16%, 其中Myxococcus macrosporus (1H01)的提取物对肺炎克雷伯菌的抑制活性显著, 优于阳性药(氨苄青霉素钠, 1mg·mL-1)。研究结果表明广西北部湾特殊海洋生境黏细菌多样性丰富, 分离出的黏细菌具有良好的抗菌活性, 为新型抗生素应用研究奠定了物质基础。

关键词: 北部湾, 黏细菌, 分离鉴定, 抗菌活性

Abstract:

The objective of this study is to isolate myxobacteria from different types of marine biotopes in the Guangxi Beibu Gulf, on the base of living-Escherichia coli and filter paper methods. 38 strains were isolated from 21 samples, and were preliminary identified based on colony morphological characteristics and 16S rRNA gene sequence analysis. The purified strains belong to 4 genera and 10 species, in which Myxococcus and Corallococcus were dominant genera, accounting for 63.16% and 26.32% of the total strains, respectively. Then the purified strains were subjected to the small-scale fermentations through the VY/2 medium, and the extracts were obtained by the extraction and concentration of acetone. The crude extracts were further screened for antimicrobial activity by filter paper agar diffusion. The results showed that the metabolites of 24 myxobacterial strains had different degrees of inhibition on 9 indicator bacteria, and the positive rate was 63.16%. Among them, the metabolites of Myxococcus macrosporus (1H01) showed significant inhibitory activity against Klebsiella pneumoniae, which was superior to the positive drugs (ampicillin sodium, 1 mg·mL-1). The results explain that the diversity of myxobateria is rich in different types marine sediment from the Guangxi Beibu Gulf, and the isolated myxobacteria has a prominent antibacterial activity, laying a foundation for the application of new antibiotics.

Key words: Beibu Gulf, myxobacteria, isolation and identification, antibacterial activity