Cited by 432Chromosomal and Genetic VariationsPlant Diversity and EvolutionGenomics and Phylogenetic Studies

Phylogenomics reveals three sources of adaptive variation during a rapid radiation

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Pease, James B., Haak, David C., Hahn, Matthew W., Moyle, Leonie C.·2016·PLOS Biology

Abstract

Speciation events often occur in rapid bursts of diversification, but the ecological and genetic factors that promote these radiations are still much debated. Using whole transcriptomes from all 13 species in the ecologically and reproductively diverse wild tomato clade (Solanum sect. Lycopersicon), we infer the species phylogeny and patterns of genetic diversity in this group. Despite widespread phylogenetic discordance due to the sorting of ancestral variation, we date the origin of this radiation to approximately 2.5 million years ago and find evidence for at least three sources of adaptive genetic variation that fuel diversification. First, we detect introgression both historically between early-branching lineages and recently between individual populations, at specific loci whose functions indicate likely adaptive benefits. Second, we find evidence of lineage-specific de novo evolution for many genes, including loci involved in the production of red fruit color. Finally, using a "PhyloGWAS" approach, we detect environment-specific sorting of ancestral variation among populations that come from different species but share common environmental conditions. Estimated across the whole clade, small but substantial and approximately equal fractions of the euchromatic portion of the genome are inferred to contribute to each of these three sources of adaptive genetic variation. These results indicate that multiple genetic sources can promote rapid diversification and speciation in response to new ecological opportunity, in agreement with our emerging phylogenomic understanding of the complexity of both ancient and recent species radiations.

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Crossref · 10.1371/journal.pbio.1002379

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  • In the wild tomato clade (Solanum section Lycopersicon), ancestral standing variation, introgression, and new mutations have contributed approximately equally to this recent adaptive radiation.

    “This is illustrated by analyses of the wild tomato clade (Solanum section Lycopersicon), in which ancestral standing variation, introgression, and new mutations have contributed approximately equally to this recent adaptive radiation (Pease et al., 2016).”

    From Genomics of plant speciation (2023) · cites this paper as Pease et al., 2016

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Authors
Pease, J. B., Haak, D. C., Hahn, M. W., & Moyle, L. C.
Affiliations
Indiana University Bloomington (US)
Corresponding author
Moyle, Leonie C.
Venue
PLOS Biology
Published
2016-02-12
Volume
14
Issue
2
Pages
e1002379
ISSN
  • 1544-9173 (ISSN-L)
  • 1545-7885
OpenAlex
W2272393905
Cited by
432
References
104
Citations by year
2026: 34 · 2025: 37 · 2024: 37 · 2023: 40 · 2022: 36 · 2021: 50 · 2020: 45 · 2019: 50 · 2018: 43 · 2017: 36 · 2016: 22 · 2015: 1
FWCI
58.95
Type
journal article
Language
en
Open access
Locations
  • PLoS Biology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • VTechWorks (Virginia Tech) (submittedVersion, cc-by)
Funders
  • National Science Foundation (1136707)
  • Division of Environmental Biology (1136707)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Plant Diversity and Evolution
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
species radiation, speciation, adaptive genetic variation, introgression, de novo gene evolution, phylogenetic incongruence, whole transcriptome, diversification
MeSH terms
Polymorphism, Genetic, Solanum lycopersicum, Genomics, Genetic Speciation

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