Introgression shapes fruit color convergence in invasive Galápagos tomato

Abstract
Data availability
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Abstract

Invasive species represent one of the foremost risks to global biodiversity. Here, we use population genomics to evaluate the history and consequences of an invasion of wild tomato-Solanum pimpinellifolium-onto the Galápagos islands from continental South America. Using >300 archipelago and mainland collections, we infer this invasion was recent and largely the result of a single event from central Ecuador. Patterns of ancestry within the genomes of invasive plants also reveal post-colonization hybridization and introgression between S. pimpinellifolium and the closely related Galapagos endemic Solanum cheesmaniae. Of admixed invasive individuals, those that carry endemic alleles at one of two different carotenoid biosynthesis loci also have orange fruits-characteristic of the endemic species-instead of typical red S. pimpinellifolium fruits. We infer that introgression of two independent fruit color loci explains this observed trait convergence, suggesting that selection has favored repeated transitions of red to orange fruits on the Galapagos.

Data availability

Raw, demultiplexed ddRAD reads have been deposited under NCBI BioProject PRJNA661300 and will be available once processed by NCBI. Genotype files, associated datasets, and analysis scripts have been deposited on Dryad (https://doi.org/10.5061/dryad.2v6wwpzkm).Additionally, data posted to Dryad can also be accessed at https://github.com/gibsonMatt/galtom.

The following data sets were generated

(2020) Data from: Reconstructing the history and biological consequences of a plant invasion on the Galápagos islands
Dryad Digital Repository 10.5061/dryad.2v6wwpzkm.

https://doi.org/10.5061/dryad.2v6wwpzkm

The following previously published data sets were used

1. Pease JB
2. Haak DC
3. Hahn MW
4. Moyle LC
(2016) Phylogenomics reveals three sources of adaptive variation during a rapid radiation
Dryad Digital Repository 10.5061/dryad.182dv.

https://doi.org/10.5061/dryad.182dv
1. Gibson MJS
2. Moyle LC
(2020) Regional differences in the abiotic environment contribute to genomic divergence within a wild tomato species
Dryad Digital Repository 10.5061/dryad.8gtht76k4.

https://doi.org/10.5061/dryad.8gtht76k4

Article and author information

Author details

Matthew JS Gibson

Department of Biology, Indiana University, Bloomington, United States

For correspondence
gibsomat@indiana.edu

Competing interests
The authors declare that no competing interests exist.

"This ORCID iD identifies the author of this article:" 0000-0001-7855-1628
Maria de Lourdes Torres

Colegio de Ciencias Biológicas y Ambientales, Laboratorio de Biotecnología Vegetal; Universidad San Francisco de Quito and University of North Carolina at Chapel Hill, Universidad San Francisco de Quito; Galapagos Science Center, Quito, Ecuador

Competing interests
The authors declare that no competing interests exist.

"This ORCID iD identifies the author of this article:" 0000-0001-7207-4568
Yaniv Brandvain

University of Minnesota, St Paul, United States

Competing interests
The authors declare that no competing interests exist.
Leonie Moyle

Department of Biology, Indiana University, Bloomington, United States

Competing interests
The authors declare that no competing interests exist.

Funding

National Science Foundation (IOS 1127059)

Leonie Moyle

Indiana University Bloomington (Brackenridge)

Matthew JS Gibson

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Copyright

This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.