![]() grows with pine, spruce, beech, willow, and birch, more rarely with oak, poplar, and linden, from spring to winter. The genus is characterized by smooth and viscid pileus, sterile gill edges, brown spore print, and ornamented spores without germ pore (Beker et al., 2016). Hebeloma is an ectomycorrhizal genus belonging to the family Hymenogastraceae within the order Agaricales and it includes more than 80 species in Central Europe (Boyle et al., 2006). In this sense, the biotic factors of soil environments could be closely interacting, ecologically connected entities to get a better insight into the dynamics of the land ecosystems (Bahram and Netherway, 2022 Netherway et al., 2021). The dynamics of the mycorrhizal associations are not solely regulated by the plant and the fungus partners but indeed, they represent a complex interplay that also involves soil invertebrates and microorganisms including viruses (Sutela et al., 2019). In some cases, this is achieved by establishing a communication network between the adjacent root system of individual plants via the mycelial network of the fungus partner (Boyno and Demir, 2022). nitrogen and phosphorous) to the plant partner, the fungal components of mycorrhizae can also protect the plant partner against various environmental stress conditions (Garg et al., 2017 Tripathi et al., 2017). Beyond providing inorganic nutrients (e.g. The vast majority of the extant land plants establish mycorrhizal associations with fungi to promote their robust growth (Brundrett and Tedersoo, 2018). ![]() Such structures build physicochemical interactions with each other to form unique nutrient-exchange complexes known as mycorrhizae (Kariman et al., 2018). This type of mutualistic relationship is embodied by the root system of plants and the mycelial network of fungi. Today it is evident that the colonization of land ecosystems by plants only became possible after the establishment of mycorrhizal symbiosis between fungi and plants (Genre et al., 2020). Nature of this virus transmission was discussed in relation to transient interspecific mycelial contact hypothesis. The physical proximity of the mycelial networks of both fungal specimens implied the occurrence of a virus transmission event with unknown mechanism. Bio-tracking studies revealed that viral loads of LcPV1 drop significantly in L. RdRp sequences encoded by the LcPV1 isolates from both host fungi was found to be identical. The two distinct fungal specimens inhabited the same vicinity of a campus garden. During NGS derived viral sequence analyses, we identified a partitivirus that is conspecific with the previously reported partitivirus (LcPV1) described from a saprotrophic fungus Leucocybe candicans. Here we report on the identification and complete genome characterization of three novel partitiviruses naturally infecting the ectomycorrhizal fungus Hebeloma mesophaeum. Mycorrhizal fungi host diverse mycoviruses that contribute to our understanding of their diversity and evolution.
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