Genetic isolation between two recently diverged populations of a symbiotic fungus

Sara Branco, Pierre Gladieux, Christopher E. Ellison, Alan Kuo, Kurt Labutti, Anna Lipzen, Igor V. Grigoriev, Hui Ling Liao, Rytas Vilgalys, Kabir G. Peay, John W. Taylor, Thomas D. Bruns

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Abstract Fungi are an omnipresent and highly diverse group of organisms, making up a significant part of eukaryotic diversity. Little is currently known about the drivers of fungal population differentiation and subsequent divergence of species, particularly in symbiotic, mycorrhizal fungi. Here, we investigate the population structure and environmental adaptation in Suillus brevipes (Peck) Kuntze, a wind-dispersed soil fungus that is symbiotic with pine trees. We assembled and annotated the reference genome for Su. brevipes and resequenced the whole genomes of 28 individuals from coastal and montane sites in California. We detected two clearly delineated coast and mountain populations with very low divergence. Genomic divergence was restricted to few regions, including a region of extreme divergence containing a gene encoding for a membrane Na+/H+ exchanger known for enhancing salt tolerance in plants and yeast. Our results are consistent with a very recent split between the montane and coastal Su. brevipes populations, with few small genomic regions under positive selection and a pattern of dispersal and/or establishment limitation. Furthermore, we identify a putatively adaptive gene that motivates further functional analyses to link genotypes and phenotypes and shed light on the genetic basis of adaptive traits.

Original languageEnglish (US)
Pages (from-to)2747-2758
Number of pages12
JournalMolecular ecology
Issue number11
StatePublished - Jun 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics


  • Suillus brevipes
  • adaptation
  • mycorrhizal fungi
  • population genomics


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