Microbial communities inhabiting the fairy ring of Floccularia luteovirens and isolation of potential mycorrhiza helper bacteria.

Floccularia luteovirens, an important edible mushroom widely distributed in the Qinghai-Tibet plateau, is ecologically important as an ectomycorrhizal fungus and can form the fairy ring. To explore the influence of F. luteovirens fairy ring on soil microbial communities, we compared the soil microbial communities in three different fairy ring zones (inside the fairy ring (IN); beneath the fairy ring (ON); and outside the fairy ring (OUT)). A total of 1.77 million bacterial reads and 1.59 million fungal reads were obtained. Moreover, sequence clustering yielded 519,613 (57,735 per sample) bacterial OTUs, and 513,204 (57,023 per sample) fungal OTUs representing. Microbial diversity was lower in samples from the ON zone compared with the other two zones. Mycorrhiza helper bacteria (MHB) such as Bradyrhizobium and Paenibacillus were more common in the ON zone, and we isolated four potential MHB from rhizosphere soil. Canonical correspondence analysis showed that the soil nutritional condition and physical changes caused by F. luteovirens shaped the microbial communities in the ON zone. This is the first report on the study of soil microbial diversity influenced by fairy ring F. luteovirens, and further studies need to be conducted to study the ecological function influenced by this species.