Runs of homozygosity reveal contrasting histories of inbreeding across global lineages of the edible porcini mushroom, Boletus edulis

Brejon Lamartinière, Etienne; Tremble, Keaton; Dentinger, Bryn T. M.; Dasmahapatra, Kanchon K.; Hoffman, Joseph I. ORCID: https://orcid.org/0000-0001-5895-8949. 2024 Runs of homozygosity reveal contrasting histories of inbreeding across global lineages of the edible porcini mushroom, Boletus edulis. Molecular Ecology, 33 (16), e17470. 13, pp. https://doi.org/10.1111/mec.17470

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Official URL: https://onlinelibrary.wiley.com/doi/10.1111/mec.17...

Abstract/Summary

Inbreeding, the mating of individuals that are related through common ancestry, is of central importance in evolutionary and conservation biology due to its impacts on individual fitness and population dynamics. However, while advanced genomic approaches have revolutionised the study of inbreeding in animals, genomic studies of inbreeding are rare in plants and lacking in fungi. We investigated global patterns of inbreeding in the prized edible porcini mushroom Boletus edulis using 225 whole genomes from seven lineages distributed across the northern hemisphere. Genomic inbreeding was quantified using runs of homozygosity (ROHs). We found appreciable variation both among and within lineages, with some individuals having over 20% of their genomes in ROHs. Much of this variation could be explained by a combination of elevation and latitude, and to a lesser extent by predicted habitat suitability during the last glacial maximum. In line with this, the majority of ROHs were short, reflecting ancient common ancestry dating back approximately 200–1700 generations ago, while longer ROHs indicative of recent common ancestry (less than approximately 50 generations ago) were infrequent. Our study reveals the inbreeding legacy of major climatic events in a widely distributed forest mutualist, aligning with prevailing theories and empirical studies of the impacts of historical glaciation events on the dominant forest tree species of the northern hemisphere.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1111/mec.17470
ISSN:	0962-1083
Additional Keywords:	Boletus edulis, ectomycorrhizal fungi, inbreeding, last glacial maximum, porcini, runs of homozygosity
Date made live:	25 Jul 2024 09:57 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/537771

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1111/mec.17470

ISSN:

0962-1083

Additional Keywords:

Boletus edulis, ectomycorrhizal fungi, inbreeding, last glacial maximum, porcini, runs of homozygosity

Date made live:

25 Jul 2024 09:57 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/537771