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The aim of this study was to investigate the effect of an ectomycorrhizal fungus ( Tuber indicum ) on the diversity of microbial communities associated with an indigenous tree,  Pinus armandii , and the microbial communities in the surrounding ectomycorhizosphere soil. High-throughput sequencing was used to analyze the richness of microbial communities in the roots or rhizosphere of treatments with or without ectomycorrhizae. The results indicated that the bacterial diversity of ectomycorhizosphere soil was significantly lower compared with the control soil. Presumably, the dominance of truffle mycelia in ectomycorhizosphere soil (80.91%) and ectomycorrhizae (97.64%) was the main factor that resulted in lower diversity and abundance of endophytic pathogenic fungi, including  Fusarium ,  Monographella ,  Ustilago  and  Rhizopus  and other competitive mycorrhizal fungi, such as  Amanita ,  Lactarius  and  Boletus . Bacterial genera  Reyranena ,  Rhizomicrobium ,  Nordella ,  Pseudomonas  and fungal genera,  Cuphophyllus ,  Leucangium ,  Histoplasma  were significantly more abundant in ectomycorrhizosphere soil and ectomycorrhizae. Hierarchical cluster analysis of the similarities between rhizosphere and ectomycorrhizosphere soil based on the soil properties differed significantly, indicating the mycorrhizal synthesis may have a feedback effect on soil properties. Meanwhile, some soil properties were significantly correlated with bacterial and fungal diversity in the rhizosphere or root tips. Overall, this work illustrates the interactive network that exists among ectomycorrhizal fungi, soil properties and microbial communities associated with the host plant and furthers our understanding of the ecology and cultivation of  T .  indicum .

Tuber indicum shapes the microbial communities of ectomycorhizosphere soil and ectomycorrhizae of an indigenous tree (Pinus armandii)