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http://dx.doi.org/10.5657/kfas.2002.35.2.115

Application of a New Conjugation Method to Fish Pathogenic Bacteria Containing R Plasmid for the Analysis of Drug-Resistant Status in Aquaculture  

Yoo Min Ho (Department of Aquatic Life Medicine, Pukyong National University)
Jeong Joon Beom (Department of Aquatic Life Medicine, Pukyong National University)
Kim Eun Heui (Department of Aqualife-medicine, Yosu National University)
Lee Hyoung Ho (Department of Biotechnology and Bioengineering, Pukyong National University)
Jeong Hun Do (Department of Aquatic Life Medicine, Pukyong National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.35, no.2, 2002 , pp. 115-121 More about this Journal
Abstract
To develop a new method of conjugation and to determine the distribution of R plasimds, we isolated multi-drug resistant strains from fish pathogenic bacteria in the farms of south and east seacoasts of Korea. Out of the 134 isolates examined, 10 showed resistance to chloramphenicol, tetracycline, streptomycin, ampicillin, colistin, nalidixic acid, oxolinic acid and kanamycin. One out of 10 multi-drug resistance bacteria, Vibfio damsela JE1 (V. damsela JE1), contained transferable R plasmid of chlorarnphenicol- tetracycline resistance genes and other nucleic acids encoding ampicillin and kanamycin resistance. The presence of the R plasmid was confirmed by conjugation using the chromocult medium (CC) as a selective and differential medium for transconiugants with identification based on the growth or colors of the colonies. The frequency of R plasmid transfer with filter mating method was come out much higher than that of broth mating method and appeared to be dependent upon the mating time and temperature. The optimum conditions for filter mating method were found to be 30$^{\circ}C$ and 24hrs as mating temperature and period, respectively, Moreover, donor cells with R plasmid, both isolate and standard bacteria, were shown to have an ability to transfer the plasmid against Escherichia coli K-12 HB101 (E. coli HB101) and Edwardsiella tarda (E. tarda) RE14 at fairly high frequencies, finally, we isolated 3 isolates of Sphingomonas sp., carrying R plasmid from 12 multi-drug resistant bacteria in normal microflora of the flounder (Paralichthys olivaceus) group used for the isolation of V emsela JE1 four months before. The same size and gene transfer chayateristics of R plasimds with those of V damsela JE1 confirmed that normal microflora have the reservoir activity for R plasmid in natural aquatic environment.
Keywords
Conjugation; R plasmid; Chromocult medium; Resistance; Edwardsiella tarda; Vibrio damscla;
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