FIGURE 5.

Plant phylogeny and flowering time influence rhizosphere bacterial community composition. Rhizosphere bacterial community beta-diversity (weighted-UniFrac distance) is positively correlated with plant host phylogenetic distance (A), days between sampling (B), and increases with plant host taxonomic rank (C). Colored bars indicate correspondence of plant phylogenetic distances and taxonomic rank between (A,C). Influence of time and plant phylogeny on bacterial taxa abundance is illustrated with two Streptomyces OTUs (D). OTUs increase in abundance over time as a result of selective enrichment in maize (top panel) or enrichment over time independent of plant phylogeny (bottom panel) (DESeq2: log₂-fold change per day = 0.08 ± 0.01 and 0.07 ± 0.01 in top and bottom panels, respectively; p < 0.05). Weighted-UniFrac distances calculated on mean genotype OTU abundances (A) and plot level OTU abundances (B,C).