Higher host plant specialization of root-associated endophytes than mycorrhizal fungi along an arctic elevational gradient

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  • Nerea Abrego, University of Helsinki, Norwegian University of Science and Technology
  • ,
  • Tea Huotari, University of Helsinki
  • ,
  • Ayco J. M. Tack, Stockholm University
  • ,
  • Björn D. Lindahl, Swedish University of Agricultural Sciences
  • ,
  • Gleb Tikhonov, University of Helsinki, Aalto University
  • ,
  • Panu Somervuo, University of Helsinki
  • ,
  • Niels Martin Schmidt
  • Otso Ovaskainen, Norwegian University of Science and Technology, University of Helsinki
  • ,
  • Tomas Roslin, University of Helsinki, Swedish University of Agricultural Sciences
Abstract How community-level specialization differs among groups of organisms, and changes along environmental gradients, is fundamental to understanding the mechanisms influencing ecological communities. In this paper, we investigate the specialization of root-associated fungi for plant species, asking whether the level of specialization varies with elevation. For this, we applied DNA barcoding based on the ITS region to root samples of five plant species equivalently sampled along an elevational gradient at a high arctic site. To assess whether the level of specialization changed with elevation and whether the observed patterns varied between mycorrhizal and endophytic fungi, we applied a joint species distribution modeling approach. Our results show that host plant specialization is not environmentally constrained in arctic root-associated fungal communities, since there was no evidence for changing specialization with elevation, even if the composition of root-associated fungal communities changed substantially. However, the level of specialization for particular plant species differed among fungal groups, root-associated endophytic fungal communities being highly specialized on particular host species, and mycorrhizal fungi showing almost no signs of specialization. Our results suggest that plant identity affects associated mycorrhizal and endophytic fungi differently, highlighting the need of considering both endophytic and mycorrhizal fungi when studying specialization in root-associated fungal communities.
Original languageEnglish
JournalEcology and Evolution
Pages (from-to)8989-9002
Number of pages14
Publication statusPublished - 2020

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