Fig. 2.

Bacterial populations in the root systems of acyl-homoserine lactone-producing (AHL) and -degrading (AiiA) tobacco plants. Number of Gram-negative and -positive bacteria from (A) AHL tobacco and (B) AiiA tobacco roots. The detail methods used to isolate Gram-negative bacteria and Gram-positive bacteria were described in Materials and Method. Bars represent the mean of 10 replications per treatment. The experiment was repeated three times with similar results.