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2018 ; 6
(1
): 116
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Network hubs in root-associated fungal metacommunities
#MMPMID29935536
Toju H
; Tanabe AS
; Sato H
Microbiome
2018[Jun]; 6
(1
): 116
PMID29935536
show ga
BACKGROUND: Although a number of recent studies have uncovered remarkable
diversity of microbes associated with plants, understanding and managing dynamics
of plant microbiomes remain major scientific challenges. In this respect, network
analytical methods have provided a basis for exploring "hub" microbial species,
which potentially organize community-scale processes of plant-microbe
interactions. METHODS: By compiling Illumina sequencing data of root-associated
fungi in eight forest ecosystems across the Japanese Archipelago, we explored
hubs within "metacommunity-scale" networks of plant-fungus associations. In
total, the metadata included 8080 fungal operational taxonomic units (OTUs)
detected from 227 local populations of 150 plant species/taxa. RESULTS: Few
fungal OTUs were common across all the eight forests. However, in each of the
metacommunity-scale networks representing northern four localities or southern
four localities, diverse mycorrhizal, endophytic, and pathogenic fungi were
classified as "metacommunity hubs," which were detected from diverse host plant
taxa throughout a climatic region. Specifically, Mortierella (Mortierellales),
Cladophialophora (Chaetothyriales), Ilyonectria (Hypocreales), Pezicula
(Helotiales), and Cadophora (incertae sedis) had broad geographic and host ranges
across the northern (cool-temperate) region, while Saitozyma/Cryptococcus
(Tremellales/Trichosporonales) and Mortierella as well as some arbuscular
mycorrhizal fungi were placed at the central positions of the metacommunity-scale
network representing warm-temperate and subtropical forests in southern Japan.
CONCLUSIONS: The network theoretical framework presented in this study will help
us explore prospective fungi and bacteria, which have high potentials for
agricultural application to diverse plant species within each climatic region. As
some of those fungal taxa with broad geographic and host ranges have been known
to promote the survival and growth of host plants, further studies elucidating
their functional roles are awaited.
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