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Contrasting demographic histories revealed in two invasive populations of the dry rot fungus Serpula lacrymans

Inger Skrede, Claude Murat, Jaqueline Hess, Sundy Maurice, Jørn Henrik Sønstebø, Annegret Kohler, Dominique Barry‐Etienne, Dan Eastwood Orcid Logo, Nils Högberg, Francis Martin, Håvard Kauserud

Molecular Ecology, Volume: 30, Issue: 12, Pages: 2772 - 2789

Swansea University Author: Dan Eastwood Orcid Logo

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DOI (Published version): 10.1111/mec.15934

Abstract

Globalization and international trade have impacted organisms around the world leading to a considerable number of species establishing in new geographic areas. Many organisms have taken advantage of human-made environments, including buildings. One such species is the dry rot fungus Serpula lacryma...

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Published in: Molecular Ecology
ISSN: 0962-1083 1365-294X
Published: Wiley 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa57678
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Abstract: Globalization and international trade have impacted organisms around the world leading to a considerable number of species establishing in new geographic areas. Many organisms have taken advantage of human-made environments, including buildings. One such species is the dry rot fungus Serpula lacrymans, which is the most aggressive wood-decay fungus in indoor environments in temperate regions. Using population genomic analyses of 36 full genome sequenced isolates, we demonstrated that European and Japanese isolates are highly divergent and the populations split 3000–19,000 generations ago, probably predating human influence. Approximately 250 generations ago, the European population went through a tight bottleneck, probably corresponding to the fungus colonization of the built environment in Europe. The demographic history of these populations, probably lead to low adaptive potential. Only two loci under selection were identified using a Fst outlier approach, and selective sweep analyses identified three loci with extended haplotype homozygosity. The selective sweep analyses found signals in genes possibly related to decay of various substrates in Japan and in genes involved DNA replication and protein modification in Europe. Our results suggest that the dry rot fungus independently established in indoor environments in Europe and Japan and that invasive species can potentially establish large populations in new habitats based on a few colonizing individuals.
Keywords: demographic inference; dry rot; fungi; population genomics; selection
College: Faculty of Science and Engineering
Funders: Universitetet i Oslo; Laboratory of Excellence ARBRE, Region Lorraine, European Regional Development Fund, Grant/Award Number: ANR-11-LABX0002-01; Beijing Forest University; The Reserach Council of Norway, Grant/Award Number: 221840
Issue: 12
Start Page: 2772
End Page: 2789

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