›› 2019, Vol. 46 ›› Issue (5): 1466-1473.doi: 10.16431/j.cnki.1671-7236.2019.05.025

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation and Identification of Mycoplasma bovis in Xinjiang

LING Chen, HAO Chengwu, HE Hai, ZHANG Fei, HOU Feng, HE Sun   

  1. Tecon Bio-technology Co,. Ltd., Urumqi 830010, China
  • Received:2018-11-25 Online:2019-05-20 Published:2019-05-20

Abstract:

In order to investigate and determine the pathogen from calf which showed pneumonia symptoms occurred in cattle farms in Xinjiang,one strain of Mycoplasma bovis was isolated from seven pneumonic lung tissue samples of calves using liquid and solid Mycoplasma medium.The isolated strain was characterized by the colonial morphologic observation and biochemistry test.Specific primers of Mycoplasma bovis and universal 16S rRNA primers of Mycoplasma were employed to amplify and the amplicons were sequenced as well.DNAStar software was used to compare the sequence between the isolate and the other strains deposited in GenBank.A phylogenetic tree of different strains based on 16S rRNA sequences was constructed by Mega 6.0 software with the Neighbor-Joining method.The results showed that colonies of isolated strain grew on solid medium were typical fried-eggs,the central depression of the colony was deep into the medium and thin and transparent periphery,and Dienes staining was dark blue.The isolated strain could not ferment glucose,not decompose urea,and not hydrolyze arginine.Hemadsorption test and hemolysis test were negative,while film and spot test and triphenyl tetrazolium chloride reduction reaction test were positive.PCR products of Mycoplasma bovis showed the specific band of 1 911 bp.Sequence analysis indicated that 16S rRNA of the isolated strain showed 99.8% homology with that of Mycoplasma bovis strain PG45,and 99.3% to 99.7% homology with that of local strains of Mycoplasma bovis (Mb NM2012,Mb HB0801,Mb Hubei-1,Mb Ningxia-1,Mb CQ-W70 and Mb 08M strains).The phylogenetic tree showed that the 16S rRNA gene of the isolated strain was closely relative with Mb Ningxia-1 and Mb 08M strains,which were in the same branch.The results confirmed that the pathogenic bacteria causing cattle death was Mycoplasma bovis,which provided theoretical basis and scientific basis for the prevention and treatment of Mycoplasma bovis in Xinjiang.

Key words: Mycoplasma bovis; isolation; identification; 16S rRNA

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