Redundancy analysis (RDA) results showing the influence of geographic, climatic, edaphic and host genetic factors on structure of putative ERM assemblages, residual fungal assemblages and the plant host population.

R2 values were calculated using envfit function in the vegan package (R 2.12), and P values were based on 9999 permutations.
Post-hoc marked by *, **, *** indicate significances at P<0.05, P<0.01, and P<0.001 after Holm-Bonferroni correction. MAT and MAP are mean annual temperature and mean annual precipitation; STC, STN, and STP indicate soil total carbon, soil total nitrogen and soil total phosphorus; HSTPC1 and HSTPC2 indicate the first two axes of Principle component analysis (PCA) of host population.