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Large-scale genome sequencing of mycorrhizal fungi provides insights into the early evolution of symbiotic traits

Shingo Miyauchi 1 Enikő Kiss 2 Alan Kuo 3 Elodie Drula 4 Annegret Kohler 1 Marisol Sánchez-García 5 Emmanuelle Morin 1 Bill Andreopoulos 3 Kerrie Barry 6 Gregory Bonito 7 Marc Buée 1 Akiko Carver 3 Cindy Chen 3 Nicolas Cichocki 1 Alicia Clum 3 David Culley 8 Pedro Crous Laure Fauchery 1 Mariangela Girlanda Richard Hayes 3 Zsófia Kéri 2 Kurt Labutti 3 Anna Lipzen 3 Vincent Lombard 4 Jon Magnuson 8 François Maillard 1 Claude C. Murat 1 Matt Nolan 3 Robin Ohm 3 Jasmyn Pangilinan 3 Maíra de Freitas Pereira 1 Silvia Perotto Martina Peter 9 Stephanie Pfister 9 Robert Riley 3 Yaron Sitrit 10 J. Benjamin Stielow Gergely Szöllősi 2 Lucia Žifčáková 11 Martina Štursová 11 Joseph Spatafora 12 Leho Tedersoo 13 Lu-Min Vaario 14 Akiyoshi Yamada 15 Mi Yan 3 Pengfei Wang Jianping Xu 16 Tom Bruns 17 Petr Baldrian 11 Rytas Vilgalys 18 Christophe Dunand 19 Bernard Henrissat 20, 4 Igor Grigoriev 3 David Hibbett 5 László Nagy 2 Francis M. Martin 1, 21 
Abstract : Mycorrhizal fungi are mutualists that play crucial roles in nutrient acquisition in terrestrial ecosystems. Mycorrhizal symbioses arose repeatedly across multiple lineages of Mucoromycotina, Ascomycota, and Basidiomycota. Considerable variation exists in the capacity of mycorrhizal fungi to acquire carbon from soil organic matter. Here, we present a combined analysis of 135 fungal genomes from 73 saprotrophic, endophytic and pathogenic species, and 62 mycorrhizal species, including 29 new mycorrhizal genomes. This study samples ecologically dominant fungal guilds for which there were previously no symbiotic genomes available, including ectomycorrhizal Russulales, Thelephorales and Cantharellales. Our analyses show that transitions from saprotrophy to symbiosis involve (1) widespread losses of degrading enzymes acting on lignin and cellulose, (2) co-option of genes present in saprotrophic ancestors to fulfill new symbiotic functions, (3) diversification of novel, lineage-specific symbiosis-induced genes, (4) proliferation of transposable elements and (5) divergent genetic innovations underlying the convergent origins of the ectomycorrhizal guild.
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Submitted on : Friday, December 18, 2020 - 4:01:50 PM
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Shingo Miyauchi, Enikő Kiss, Alan Kuo, Elodie Drula, Annegret Kohler, et al.. Large-scale genome sequencing of mycorrhizal fungi provides insights into the early evolution of symbiotic traits. Nature Communications, Nature Publishing Group, 2020, 11 (1), ⟨10.1038/s41467-020-18795-w⟩. ⟨hal-03082507⟩



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