Effects of Enrofloxacin on the Growth and Attachment of Bdellovibrio Bacteria

Abstract:

In the experiment, the production of plagues by Bdellovibrio bacteria in solid medium cultivation, the reproduction of Bdellovibrio bacteria in liquid medium cultivation and the attachment of Bdellovibrio bacteria to carrier were observed, which aimed to study the effects of enrofloxacin on the growth and attachment ability of Bdellovibrio bacteria BDF-H16. Results indicated that in solid medium cultivation, the production of plagues by Bdellovibrio bacteria BDF-H16 was inhibited by different concentrations (2 μg/mL, 5 μg/mL, 10 μg/mL, 20 μg/mL, 50 μg/mL) of enrofloxacin and the inhibitory effects of enrofloxacin became stronger with the increase of the concentration of enrofloxacin. Similarly, in liquid medium cultivation, the reproduction of Bdellovibrio bacteria BDF-H16 was also obviously inhibited by different concentrations of enrofloxacin and higher concentrations of enrofloxacin such as 10 μg/mL, 20 μg/mL, 50 μg/mL had stronger inhibitory effects on the reproduction of BDF-H16. However, the growth tendency of Bdellovibrio bacteria BDF-H16 was not inhibited in 10 μg/mL enrofloxacin. Additionally, when zeolite was added, enrofloxacin had also inhibitory effects on the numbers of Bdellovibrio bacteria BDF-H16 attached to zeolite. With the increase of the concentrations of enrofloxacin, the numbers of Bdellovibrio bacteria BDF-H16 attached to zeolite became smaller and smaller. However, the attachment rate of Bdellovibrio bacteria BDF-H16 to zeolite became higher under 2 μg/mL-20 μg/mL enrofloxacin. The results above showed that enrofloxacin had inhibitory effects on the plague production and reproduction of Bdellovibrio bacteria BDF-H16, but the attachment ability of Bdellovibrio bacteria BDF-H16 was strengthened in liquid medium cultivation with 2 μg/mL-20 μg/mL enrofloxacin and zeolite, and adding zeolite helped to reduce the adverse effects of enrofloxacin on Bdellovibrio bacteria BDF-H16.