China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (3): 1064-1071.doi: 10.16431/j.cnki.1671-7236.2021.03.031

• Basic Veterinary Medicine • Previous Articles     Next Articles

Isolation and Identification of One Strain of Mycoplasma gallisepticum and Screening of Sensitive Traditional Chinese Medicine in vitro

GUO Yangli, SONG Xiang, LIU Naizhi, QI Xiuye, CHENG Fuliang, XU Haiyan, GU Wei   

  1. Shandong Key Laboratory of Animal Microecological Preparations, Shandong Baolai-Leelai Bioengineering Co., Ltd., Tai'an 271000, China
  • Received:2020-08-27 Online:2021-03-20 Published:2021-03-18

Abstract: The study was aimed to isolate,cultivate,identify and purify the prevalent strains of Mycoplasma gallisepticum in Tai'an,Shandong,and to screen sensitive traditional Chinese medicines against the isolates in order to provide materials for further research.The methods of liquid culture and solid culture were used to isolate,culture and purify the Mycoplasma gallisepticum strain from the tissue samples of diseased chickens,the isolate was preliminarily identified by Swiss staining and Giemsa staining,serological methods and molecular biological methods.On this basis,the micro-dilution method was used to determine the minimum inhibitory concentration (MIC) of the eight Chinese medicines against the isolated strains,in order to screen the Chinese medicines sensitive to the isolated strains.The results showed that after the isolated strains were proliferated in the liquid medium of Mycoplasma gallisepticum,the color of the medium changed from red to yellow and was translucent,after cultured in the solid medium,it showed a typical ‘fried egg’-like colony,which were consistent with the culture characteristics of Mycoplasma gallisepticum.The Swiss staining and Giemsa staining results indicated that the morphology of the bacteria was consistent with the characteristics of Mycoplasma gallisepticum.The serological identification results showed that the isolate had agglutinated with the positive serum of Mycoplasma gallisepticum.The molecular biology identification results showed the matching degree of the amplified nucleic acid sequence with Mycoplasma gallisepticum was as high as 99%.The result of MIC showed that the antibacterial activity of traditional Chinese medicines Coptis chinensis and Corcagium were sensitive to the isolated Mycoplasma gallisepticum,the MIC were ≤0.98 and 0.39 mg/mL,respectively.While the traditional Chinese medicine Fagopyrum dibotrys (D.Don) Hara and Houttuynia aucuparia were moderately sensitive to Mycoplasma gallisepticum,with MIC ≥125 mg/mL.Isatidis Radix,Nova cortices album,Angelica sinensis and Et persequebantur Josue were not sensitive to Mycoplasma gallisepticum.In conclusion,a Mycoplasma gallisepticum strain was successfully isolated in this study,and screened out four kinds of sensitive traditional Chinese medicines to this strain,which were Coptis chinesis,Corcagium,Fagopyrum dibotrys (D.Don) Hara and Houttuynia aucuparia,respectively,it provided a reference basis for further study of traditional Chinese medicine prescriptions of prevention and treatment of Mycoplasma gallisepticum.

Key words: Mycoplasma gallisepticum; isolation; traditional Chinese medicine; minimum inhibitory concentration

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