Fig. 4

Fungal communities are separable by rhizocompartment and endocompartment. a Principal component analysis of OTUs abundance data indicates that the largest separation between rhizocompartment and endocompartment is spatial proximity to the root (PC1) and the second largest source of variation is host genotype and inoculation (PC2). b Co-occurrence networks were constructed based on correlation analysis of taxonomic profiles. Connections were drawn between nodes that were significantly (P < 0.01; Spearman’s rank correlation test) and highly correlated. The size and color of each node were proportional to the number of connections and module of the microbe, respectively. The colors of the links were mapping to the correlation (Red: positive correlation; Blue: negative correlation). c Cladogram indicating the phylogenetic distribution of fungal lineages associated with the rhizospheric and entospheric communities. The circles from inside to outside indicate fungal taxonomic levels from phylum to genus. Each small circle at each classification level represents a classification at that level, and each circle’s diameter is proportional to the taxon’s abundance. Yellow dots represent fungi not significantly varying in abundance among treatments. Biomarker fungi are coloured according to their correspondingly class colors on the right. Red nodes represent the fungal taxa that play an important role in the red group, the green nodes represent the fungal taxa that play an important role in the green group, which is applicable to the other circles. The names of the species in English letters are shown in the illustration on the right