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

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.17892· OSTI ID:1856713
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  1. Clark Univ., Worcester, MA (United States)
  2. Univ. de Lorraine, Champenoux (France)
  3. Aix‐Marseille Univ. (France); USC1408 Architecture et Fonction des Macromolécules Biologiques (AFMB), Marseille (France)
  4. Univ. de Bourgogne Franche‐Comté, Dijon (France)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); USDOE Joint Genome Institute (JGI), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  7. Biological Research Centre, Szeged (Hungary); Eötvös Loránd Univ., Budapest (Hungary)
  8. Aix‐Marseille Univ. (France); King Abdulaziz Univ., Jeddah (Saudi Arabia)
  9. Univ. of Tennessee, Knoxville, TN (United States)
  10. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  11. Univ. de Lorraine, Champenoux (France); Beijing Forestry Univ. (China)
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 hyperdiverse 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. Here, some PCWDEs have been retained or even expanded, mostly in a species-specific manner. The genome of G. convolvens possesses some characteristics of ECM genomes (e.g. loss of some PCWDEs, TE expansion, reduction in secondary metabolism clusters). Functional specialization in ECM 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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1856713
Alternate ID(s):
OSTI ID: 1855295
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 5 Vol. 233; ISSN 0028-646X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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