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

Shingo Miyauchi
Emmanuelle Morin
Pierre Emmanuel Courty
Annegret Kohler
László Nagy
David Hibbett
Jesse Labbé
Francis Martin
  • Function : Correspondent author
  • PersonId : 1203179

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Abstract

Summary The ectomycorrhizal (ECM) symbiosis has independently evolved from diverse types of saprotrophic ancestors. In this study, we seek to identify genomic signatures of the transition to the ECM habit within the hyper-diverse Russulaceae. We present comparative analyses of the genomic architecture and the total and secreted gene repertoires of 18 species across the order Russulales of which 13 are newly sequenced, including a representative of a saprotrophic member of Russulaceae, Gloeopeniophorella convolvens. 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 transposable element (TE) content, a reduction in secondary metabolism clusters, and an association of small secreted proteins (SSPs) with TE “nests”, or dense aggregations of TEs. Some PCWDEs have been retained or even expanded, mostly in a species-specific manner. The genome of Gloeopeniophorella convolvens possesses some characteristics of ECM genomes (e.g., loss of some PCWDEs, TE expansion, reduction in secondary metabolism clusters). Functional specialization in ectomycorrhizal decomposition may drive diversification. Accelerated gene evolution predates the evolution of the ECM habit, indicating that changes in genome architecture and gene content may be necessary to prime the evolutionary switch.

Dates and versions

hal-04033326 , version 1 (17-03-2023)

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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-04033326⟩
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