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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (29): 99-106.doi: 10.11924/j.issn.1000-6850.casb2025-0325

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Inhibitory Activity and Mechanism of Honokiol Against Chinese Cabbage Soft Rot

WANG Jiafei1(), LYU Hangjun1, XIE Jiale2, CAI Jin3()   

  1. 1 Modern Research Center for Traditional Chinese Medicine, Shanxi University, Taiyuan 030006
    2 School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006
    3 Institute of Applied Chemistry, Shanxi University, Taiyuan 030006
  • Received:2025-01-21 Revised:2025-05-15 Online:2025-10-15 Published:2025-10-22

Abstract:

This study aimed to investigate the antibacterial activity and mechanism of honokiol against Pectobacterium carotovorum subsp. carotovorum (Pcc). This experiment used Pcc as the test strain and honokiol as the test compound, to determine the antibacterial effect of honokiol against Pcc using the inhibition zone method and turbidimetric method, and explored its antibacterial mechanism by testing cell wall integrity, cell membrane integrity and permeability, and respiratory activity. The results of the antibacterial experiment showed that the inhibition zone diameter of 10 mg/mL honokiol was 23.71±0.86 mm, and its minimum inhibitory concentration value was 0.0156 mg/mL. After honokiol treatment, extracellular alkaline phosphatase (AKP) activity, propidium iodide (PI) fluorescence intensity, extracellular nucleic acid leakage, and protein leakage increased significantly (P<0.05), whereas cell membrane potential and total ATPase (T-ATPase) activity decreased significantly (P<0.05).These results indicated that honokiol exhibited significant antibacterial activity against Pcc by disrupting cell wall and membrane structures, increasing membrane permeability, and inhibiting respiratory function.

Key words: plant-derived fungicide, honokiol, soft rot of Chinese cabbage, antibacterial activity, antibacterial mechanism