Figure A4.

Mean (±SE) seedling fresh biomass (mg) per wild cabbage population (B. oleracea) on the 7th day following continuous exposure to bacterial volatiles. (a) P. marginalis, P. azotoformans and the combination of both compared to 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). Significant differences are indicated by different letters above bars based on Tukey HSD multiple comparison tests in General Linear Model and the interaction with plant populations (n = 3), (p < .05). Abbreviations for the plant populations: Durdle Door (DD), Kimmeridge (KIM), Old Harry (OH), St. Aldhelms Head (SAH) and Winspit (WIN) [Correction added on 4 December first online publication: Figure A4 has been moved from Supporting Information to the Appendix section]