3 years ago

Population genomics in wild tomatoes - the interplay of divergence and admixture.

Laura E Rose, Thorsten Kloesges, Ian Beddows, Aparna Reddy
Hybridization between closely related plant species is widespread, but the outcomes of hybridization are not fully understood. This study investigates phylogenetic relationships and the history of hybridization in the wild tomato clade (Solanum sect. Lycopersicon).We sequenced RNA from individuals of 38 different populations and, by combining this with published data, build a comprehensive genomic dataset for the entire clade.The data indicate that many taxa are not monophyletic and many individuals are admixed due to repeated hybridization. The most polymorphic species, S. peruvianum, has two genetic and geographical subpopulations, while its sister species, S. chilense, has distinct coastal populations and reduced heterozygosity indicating a recent expansion south following speciation from S. peruvianum c. 1.25 million years ago. Discontinuous populations west of 72° are currently described as S. chilense, but are genetically intermediate between S. chilense and S. peruvianum.Based upon molecular, morphological, and crossing data, we test the hypothesis that these discontinuous 'S. chilense' populations are an example of recombinational speciation. Recombinational speciation is rarely reported, and we discuss the difficulties in identifying it and differentiating between alternative demographic scenarios. This discovery presents a new opportunity to understand the genomic outcomes of hybridization in plants.

Publisher URL: http://doi.org/10.1093/gbe/evx224

DOI: 10.1093/gbe/evx224

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.