Abstract: By means of liquid culture, the inhibition of 5 antibiotics on bacteria contaminated by culture medium and degradation of edge cells of pea root were determined. The results showed that the five kinds of antibiotics in 50~4 000 mg/L concentration gradient, in both the edge bacterial cell cultures of certain inhibitory effect. Among them, the appropriate selective concentrations of roxithromycin, cefuroxime octyl and enol were 2 000, 1 000 and 1 000 mg/L, respectively, and the inhibitory rates reached 93.48%, 58.70% and 91.30%, respectively. The degradation of penicillin, roxithromycin, cefuroxime octyl, gentamicin and enol at 500, 500, 1 000, 1 000 and 500 mg/L on marginal cells was slow, which was 63.89%, 58.95%, 60.80%, 73.15% and 58.95%, respectively. The effect on marginal cells was significantly enhanced with the increase of concentration.

Key words: antibiotics, bacterial contamination, marginal cells, inhibition