Figure 4.

Primary root length (mean ± SE) of all wild cabbage (B. oleracea) population seedlings when exposed for five days to bacterial volatiles emitted by (A) P. marginalis, P. azotoformans, and the combination of both compared with the control (B. oleracea without exposure to bacterial volatiles). (B) when exposed to bacterial volatiles emitted by monocultures of S. rhizophila, P. orientalis, and P. agglomerans or control (no bacterial volatile exposure) for five days. Different letters above bars are based on Tukey HSD multiple comparison tests in general linear model (n = 15) and indicate significant differences between the treatments and the control