Evolutionary transition to the ectomycorrhizal habit in the genomes of a hyperdiverse lineage of mushroom‐forming fungi - Archive ouverte HAL Access content directly
Journal Articles New Phytologist Year : 2022

Evolutionary transition to the ectomycorrhizal habit in the genomes of a hyperdiverse lineage of mushroom‐forming fungi

Brian Looney
  • Function : Author
Shingo Miyauchi
Emmanuelle Morin
Pierre Emmanuel Courty
  • Function : Author
Annegret Kohler
Alan Kuo
Kurt Labutti
Anna Lipzen
Kerrie Barry
Igor Grigoriev
David Hibbett
  • Function : Author
Francis Martin

Abstract

The ectomycorrhizal (ECM) symbiosis has independently evolved from diverse types ofsaprotrophic ancestors. In this study, we seek to identify genomic signatures of the transitionto the ECM habit within the hyperdiverse Russulaceae.We present comparative analyses of the genomic architecture and the total and secretedgene repertoires of 18 species across the order Russulales, of which 13 are newly sequenced,including a representative of a saprotrophic member of Russulaceae,Gloeopeniophorellaconvolvens.The genomes of ECM Russulaceae are characterized by a loss of genes for plant cell wall-degrading enzymes (PCWDEs), an expansion of genome size through increased transposableelement (TE) content, a reduction in secondary metabolism clusters, and an association ofsmall secreted proteins (SSPs) with TE ‘nests’, or dense aggregations of TEs. Some PCWDEshave been retained or even expanded, mostly in a species-specific manner. The genome ofG.convolvenspossesses some characteristics of ECM genomes (e.g. loss of some PCWDEs, TEexpansion, reduction in secondary metabolism clusters).Functional specialization in ECM decomposition may drive diversification. Accelerated geneevolution predates the evolution of the ECM habit, indicating that changes in genome archi-tecture and gene content may be necessary to prime the evolutionary switch

Dates and versions

hal-03606184 , version 1 (11-03-2022)

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Brian Looney, Shingo Miyauchi, Emmanuelle Morin, Elodie Drula, Pierre Emmanuel Courty, et al.. Evolutionary transition to the ectomycorrhizal habit in the genomes of a hyperdiverse lineage of mushroom‐forming fungi. New Phytologist, 2022, 233 (5), pp.2294-2309. ⟨10.1111/nph.17892⟩. ⟨hal-03606184⟩
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