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Suillus is among the best-known examples of an ectomycorrhizal ECM fungal genus that demonstrates a high degree of host specificity. Currently recognized host genera of Suillus include Larix, Pinusand Pseudotsugawhich all belong to the pinoid clade of the family Pinaceae. Intriguingly, Suillus sporocarps have been sporadically collected in forests in which known hosts from these genera are locally absent.
To determine the capacity of Suillus to associate with alternative hosts in both the pinoid and abietoid clades of Pinaceae, we examined the host associations of two Suillus species S. Root tip collections underneath Suillus sporocarps were molecularly identified fungi: nuc rDNA internal transcribed spacer region ITS The bioassays contained both single- and two-species treatments, including a primary Larix or Pseudotsuga and a secondary Picea, Pinusor Abies host.
For the S. The field-based confirmed that Suillus fungi were able to associate with Abies and Tsuga hosts, representing novel host genera for this genus. In the bioassays, colonization on the primary hosts was detected in both single- and two-species treatments, but no colonization was present when Picea and Abies hosts were grown alone.
Removal of a primary host had no effect on percent ECM colonization, suggesting that primary hosts are not necessary for sustaining Suillus colonization once they are successfully established on secondary hosts. Collectively, our indicate that host specificity is more flexible in this genus than ly acknowledged and help to explain the presence of Suillus in forests where recognized hosts are not present. We thank Bill Bryden for assistance with spore inoculum for the Suillus glandulosus bioassay and Stuart Graham for additional Suillus punctatipes sporocarp collections.
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Advanced search. Mycologia Latest Articles. Submit an article Journal home. Research Article. Peter G. Paul, Minnesota Correspondence kennedyp umn. Received 20 Jan Log in via your institution Loading institutional options Access through your institution. Username Password Forgot password?
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