Isolation of Endophytic Fungi from Wild Licorice and the Activity of Its Secondary Metabolites
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(1.Key Laboratory of Herbal-Tibetan Drug Screening and Deep Processing of Gansu Province, School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050;2.College of Life Sciences, Northwest Normal University, Lanzhou 730060;3.Food and Drug Administration Review and Certification Center of Gansu Province, Lanzhou 730070)

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    Abstract:

    Objective: In this study, endophytic fungi from wild Glycyrrhiza uralensis Fisch were isolated and the antibacterial and antioxidant activities of their secondary metabolites were evaluated. Method: Using fresh wild licorice as material, the different tissue parts of licorice were treated by tissue cutting method, and then the endophytic fungi were separated and purified with 9 different media and carry out molecular biological identification. The antimicrobial activities of their metabolites against five tested strains was evaluated by paper diffusion method. The antioxidant activity of the metabolites was evaluated by DPPH and ·OH radical scavenging capacity. Results: 128 strains of fungi were isolated from the plant licorice, which belonged to 5 different genera through molecular biology identification. YS-6 fermentation broth showed certain antibacterial activity against Staphylococcus aureus. The DPPH free radical scavenging rate of GS-6a fermentation broth was 97.54%, and the ·OH free radical scavenging rate of GS-6a mycelium was 98.83%. Conclusion: The resources of endophytic fungi isolated from licorice are abundant and diverse, which are good sources for screening antibacterial and antioxidant substances.

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History
  • Received:May 19,2021
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  • Online: June 15,2022
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