Abstract
Tricholoma matsutake is an ectomycorrhizal fungus usually
associated with Pinus densiflora in South Korea. Fruiting
bodies (mushrooms) of T. matsutake are economically important
due to their attractive aroma; yet, T. matsutake is
uncultivatable and its habitat is rapidly being eradicated due
to global climate change. Root-associated bacteria can influence
the growth of ectomycorrhizal fungi that co-exist in the
host rhizosphere and distinctive bacterial communities are
associated with T. matsutake. In this study, we investigated
how these bacterial communities affect T. matsutake growth
by isolating bacteria from the roots of P. densiflora colonized
by ectomycorrhizae of T. matsutake and co-culturing rootassociated
bacteria with T. matsutake isolates. Thirteen species
of bacteria (27 isolates) were found in pine roots, all
belonging to the orders Bacillales or Burkholderiales. Two
species in the genus Paenibacillus promoted the growth of
T. matsutake in glucose poor conditions, likely using soluble
metabolites. In contrast, other bacteria suppressed the growth
of T. matsutake using both soluble and volatile metabolites.
Antifungal activity was more frequent in glucose poor conditions.
In general, pine rhizospheres harbored many bacteria
that had a negative impact on T. matsutake growth and the
few Paenibacillus species that promoted T. matsutake growth.
Paenibacillus species, therefore, may represent a promising
resource toward successful cultivation of T. matsutake.
Citations
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