FIG 2.

Principal coordinates analysis reveals the similarities of bacterial root communities in VOC-exposed plants and those from biowalls. Open symbols, communities from VOC⁺ and biowall-grown roots, which generally clustered on the upper end of the third principal coordinate axis; filled symbols, VOC⁻ and soil-grown roots. Different shapes reveal different experiments, whereas different colors help to distinguish the host plant species considered in this pooled analysis. While these results were based on community similarity measures obtained with the Bray-Curtis metric, weighted UniFrac distances yielded generally similar findings (data not shown).