The ectomycorrhizal basidiomycete <i>Laccaria bicolor</i> releases a secreted β‐1,4 endoglucanase that plays a key role in symbiosis development

Zhang, Feng; Anasontzis, George E; Labourel, Aurore; Champion, Charlotte; Haon, Mireille; Kemppainen, Minna; Commun, Carine; Deveau, Aurélie; Pardo, Alejandro Guillermo; Veneault‐Fourrey, Claire; Kohler, Annegret; Rosso, Marie‐Noëlle; Henrissat, Bernard; Berrin, Jean‐Guy; Martin, Francis

doi:10.1111/nph.15113

Cited by 61 publications

(50 citation statements)

References 37 publications

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“…This observation recalls other mycorrhizal systems, like the ECM formed by Tuber melanosporum, where the upregulation of a GH45 gene suggests a role in ECM development [20]. A recent study on the ECM fungus Laccaria bicolor suggests that a GH5 endoglucanase may have an important role in reshaping the plant cell wall during symbiosis [38], and it has been speculated that endoglucanases may be responsible for plant-cell remodeling during early fungal colonization on poplar [19].…”

Section: Discussionsupporting

confidence: 71%

The Dark Side of Orchid Symbiosis: Can Tulasnella calospora Decompose Host Tissues?

Adamo

Chialva

Calevo

et al. 2020

IJMS

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Photosynthetic orchids associate with mycorrhizal fungi that can be mostly ascribed to the “rhizoctonia” species complex. Rhizoctonias’ phylogenetic diversity covers a variety of ecological/nutritional strategies that include, beside the symbiosis establishment with host plants, endophytic and pathogenic associations with non-orchid plants or saprotrophic soil colonization. In addition, orchid mycorrhizal fungi (OMF) that establish a symbiotic relationship with an orchid host can later proliferate in browning and rotting orchid tissues. Environmental triggers and molecular mechanisms governing the switch leading to either a saprotrophic or a mycorrhizal behavior in OMF remain unclear. As the sequenced OMF genomes feature a wide range of genes putatively involved in the degradation of plant cell wall (PCW) components, we tested if these transitions may be correlated with a change in the expression of some PCW degrading enzymes. Regulation of several genes encoding PCW degrading enzymes was evaluated during saprotrophic growth of the OMF Tulasnella calospora on different substrates and under successful and unsuccessful mycorrhizal symbioses. Fungal gene expression in planta was investigated in two orchid species, the terrestrial Mediterranean Serapias vomeracea and the epiphytic tropical Cattleya purpurata. Although we only tested a subset of the CAZyme genes identified in the T. calospora genome, and we cannot exclude therefore a role for different CAZyme families or members inside a family, the results showed that the degradative potential of T. calospora is finely regulated during saprotrophic growth and in symbiosis, often with a different regulation in the two orchid species. These data pose novel questions about the role of fungal PCW degrading enzymes in the development of unsuccessful and successful interactions.

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Section: Discussionsupporting

confidence: 71%

The Dark Side of Orchid Symbiosis: Can Tulasnella calospora Decompose Host Tissues?

Adamo

Chialva

Calevo

et al. 2020

IJMS

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“…Their secreted proteases, LPMOs, and laccases may act in concert to decay available SOM compounds. Alternative hypotheses for the role of the remaining PCWDEs in ectomycorrhizal fungi include the remodeling of root cell walls during host colonization 42 .…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2020

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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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“…In this special issue, Zhang et al . (; in this issue of New Phytologist , pp. 1309–1321) uncover a new function.…”

Section: Ectomycorrhizal Symbiosismentioning

confidence: 98%

Cross‐scale integration of mycorrhizal function

et al. 2018

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The ectomycorrhizal basidiomycete Laccaria bicolor releases a secreted β‐1,4 endoglucanase that plays a key role in symbiosis development

Cited by 61 publications

References 37 publications

The Dark Side of Orchid Symbiosis: Can Tulasnella calospora Decompose Host Tissues?

The Dark Side of Orchid Symbiosis: Can Tulasnella calospora Decompose Host Tissues?

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

Cross‐scale integration of mycorrhizal function

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