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Expanding genomics of mycorrhizal symbiosis

Journal Article · · Frontiers in Microbiology
 [1];  [2];  [2];  [1]
  1. United States Department of Energy Joint Genome Institute, Walnut Creek, CA (United States)
  2. Universite de Lorraine, Nancy (France). Lab. of Excellence for Advanced Research on the Biology of Tree and Forest Ecosystems
The mycorrhizal symbiosis between soil fungi and plant roots is a ubiquitous mutualism that plays key roles in plant nutrition, soil health, and carbon cycling. The symbiosis evolved repeatedly and independently as multiple morphotypes [e.g., arbuscular mycorrhizae (AM), ectomycorrhizal (ECM)] in multiple fungal clades (e.g., phyla Glomeromycota, Ascomycota, Basidiomycota). The accessibility and cultivability of many mycorrhizal partners make them ideal models for symbiosis studies. Alongside molecular, physiological, and ecological investigations, sequencing led to the first three mycorrhizal fungal genomes, representing two morphotypes and three phyla. The genome of the ECM basidiomycete Laccaria bicolor showed that the mycorrhizal lifestyle can evolve through loss of plant cell wall-degrading enzymes (PCWDEs) and expansion of lineage-specific gene families such as short secreted protein (SSP) effectors. The genome of the ECM ascomycete Tuber melanosporum showed that the ECM type can evolve without expansion of families as in Laccaria, and thus a different set of symbiosis genes. The genome of the AM glomeromycete Rhizophagus irregularis showed that despite enormous phylogenetic distance and morphological difference from the other two fungi, symbiosis can involve similar solutions as symbiosis-induced SSPs and loss of PCWDEs. The three genomes provide a solid base for addressing fundamental questions about the nature and role of a vital mutualism.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1213050
Alternate ID(s):
OSTI ID: 1424218
Report Number(s):
LBNL--177928
Journal Information:
Frontiers in Microbiology, Journal Name: Frontiers in Microbiology Vol. 5; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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Infection mechanisms and putative effector repertoire of the mosquito pathogenic oomycete Pythium guiyangense uncovered by genomic analysis journal April 2019
Unusual genome expansion and transcription suppression in ectomycorrhizal Tricholoma matsutake by insertions of transposable elements journal January 2020
Molecular Signalling During the Ectomycorrhizal Symbiosis book January 2019
Ericoid mycorrhizal fungi and their genomes: another side to the mycorrhizal symbiosis? journal May 2018
Tracing the origin and evolution of pseudokinases across the tree of life journal April 2019
Fungal Traits That Drive Ecosystem Dynamics on Land journal May 2015

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