comparison of antibiotics and bacteriocins antibacterial activity on xanthomonas citri subsp.citri

Citrus canker is a citrus disease species created by the bacterium xanthomonas citri subsp.citri. many citrus, such as oranges, lime, and grapefruit are affected by the infectious bacteria and stems, leaves and fruits are experiencing loss. in this experiment antibacterial effects of five kinds of antibiotics including ampicillin, kanamycin, chloramphenicol, penicillin, streptomycin, cronobacteriocin dgh2 and enterobacteriocin dgh4 were evaluated on 107 strains of xanthomonascitri subsp.citri. mic and mbc data for antibiotics and bacteriocins against xanthomonas strains were performed. according to this project, xanthomonas strains were comparatively susceptible and resistant to cronobacteriocin dgh2, enterobacteriocin dgh4, ampicillin, kanamycin, chloramphenicol, penicillin and streptomycin. nigeb-183 strain is the most sensitive to these antibiotics and bacteriocins. however, only the nigeb-242r1 strain is resistant to chloramphenicol. penicillin has minimum inhibitory effects on xanthomonas strains. based on this case study, chloramphenicol is the most antibacterial activity among antibacterial agents and this compound is a good candidate for inhibitory activity. cronobacteriocin dgh2 has a moderate antibacterial activity against xanthomonas strains.