Figure 1.

Effect of Notopterygium incisum crude extract on rhlI (A) and phzA1 (B) expression by disc diffusion assay. Reporter strains were mixed with the Luria–Bertani (LB) agar medium (Luria–Bertani broth with 0.8% agar), and after incubation, images of the plates were captured under both white light (left) and in dark (right). In dark, inhibition of light production of the reporters is visualized as dark zones around the samples. The concentrations of crude extracts used in each spot are indicated on the right. (C) The growth comparison by CFU counting using drop plate method. The grayish color on the right was due to the color of the crude extract. The samples were tested in triplicate in three columns.