Fig. 3

Principal component analysis (PCA) of bacterial communities associated with rhizosphere and roots of S. chamaejasme in the five different sampling sites along an elevation gradient. Each red circle indicates a sampling site. Distances between any two circles on the graph indicate the ecological distance between the community compositions. Ovals drawn with black dashed lines represent the associations of rhizosphere and root samples in different elevations, respectively. Vectors are indicating the importance of each single parameter (single bacterial phyla). 1, Acidobacteria; 2, Actinobacteria; 3, α-proteobacteria; 4, Armatimonadetes; 5, Bacteroidetes; 6, β-proteobacteria; 7, Chloroflexi; 8, δ-proteobacteria; 9, Firmicutes; 10, γ-proteobacteria; 11, Gemmatimonadetes; 12, Saccharibacteria; 13, Uncultured bacterium; 14, Verrucomicrobia