Mar 24, 2020

Phylogenetic diversity of 200+ isolates of the ectomycorrhizal fungus Cenococcum geophilum associated with Populus trichocarpa soils in the Pacific Northwest, USA and comparison to globally distributed representatives

BioRxiv : the Preprint Server for Biology
J. VelezChristopher W Schadt


The ectomycorrhizal fungal symbiont Cenococcum geophilum is of great interest as it is globally distributed, associates with many plant species, and has resistance to multiple environmental stressors. C. geophilum is only known from asexual states but is often considered a cryptic species complex, since extreme phylogenetic divergence is often observed within morphologically identical strains. Alternatively, C. geophilum may represent a highly diverse single species, which would suggest cryptic but frequent recombination. Here we describe a new isolate collection of 229 C. geophilum isolates from soils under Populus trichocarpa at 123 collection sites spanning a ~283 mile north-south transect in Washington and Oregon, USA (PNW). To further understanding of the phylogenetic relationships within C. geophilum, we performed maximum likelihood phylogenetic analyses to assess divergence within the PNW isolate collection, as well as a global GAPDH phylogenetic analysis of 789 isolates with publicly available data from the United States, Europe, Japan, and other countries. Phylogenetic analyses of the PNW isolates revealed three distinct phylogenetic groups, with 15 clades that strongly resolved at >80% bootstrap support based on a GAP...Continue Reading

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Mentioned in this Paper

AS 2
Recombination, Genetic
Genome, Human
Mutation Abnormality
Population Group

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