FIG 2.

Phenazine production in King’s B broth by the 63 strains under study. Three phenazine compounds (PCA, PCN, and 2-OH-PHZ) were quantified from 5-day-old KB broth cultures using HPLC. The colors correspond to PCA (white), PCN (gray), and 2-OH-PHZ (black). The symbol “–” indicates the absence of phenazine detection. Phenazine production by the different strains was compared between each other using Kruskal-Wallis and post hoc tests. Two groups of strains were statistically discriminated, one group encompassing the strains with high phenazine production (H) and the other encompassing the strains with low phenazine production (L). Error bars represent the standard errors. The colors used for each strain correspond to the following phylogenetic groups: P. fluorescens subgroup (orange), P. gessardii subgroup (yellow), CMR12a/CMR5c subgroup (green), and P. chlororaphis subgroup (blue).