Population Genomics of the "Arcanum" Species Group in Wild Tomatoes: Evidence for Separate Origins of Two Self-Compatible Lineages

Given their diverse mating systems and recent divergence, wild tomatoes ( section ) have become an attractive model system to study ecological divergence, the build-up of reproductive barriers, and the causes and consequences of the breakdown of self-incompatibility. Here we report on a lesser-studi...

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Published inFrontiers in plant science Vol. 12; p. 624442
Main Authors Florez-Rueda, Ana M, Scharmann, Mathias, Roth, Morgane, Städler, Thomas
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers 19.03.2021
Frontiers Media S.A
Subjects
Biodiversity
Genetics
Life Sciences
mating systems
nucleotide diversity
Plant Science
Plants genetics
population genomics
Populations and Evolution
self-fertilization
Solanum
species delimitation
S-locus
species delimitation
population genomics
mating systems
Solanum
nucleotide diversity
self-fertilization
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Summary:Given their diverse mating systems and recent divergence, wild tomatoes ( section ) have become an attractive model system to study ecological divergence, the build-up of reproductive barriers, and the causes and consequences of the breakdown of self-incompatibility. Here we report on a lesser-studied group of species known as the "Arcanum" group, comprising the nominal species , , and . The latter two taxa are self-compatible but are thought to self-fertilize at different rates, given their distinct manifestations of the morphological "selfing syndrome." Based on experimental crossings and transcriptome sequencing of a total of 39 different genotypes from as many accessions representing each species' geographic range, we provide compelling evidence for deep genealogical divisions within ; only the self-incompatible lineage known as "var. marañón" has close genealogical ties to the two self-compatible species. Moreover, there is evidence under multiple inference schemes for different geographic subsets of var. marañón being closest to and , respectively. To broadly characterize the population-genomic consequences of these recent mating-system transitions and their associated speciation events, we fit demographic models indicating strong reductions in effective population size, congruent with reduced nucleotide and -locus diversity in the two independently derived self-compatible species.
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PMCID: PMC8018279
This article was submitted to Plant Systematics and Evolution, a section of the journal Frontiers in Plant Science
These authors share first authorship
Present address: Ana M. Florez-Rueda, Plant Developmental Genetics, Department of Plant and Microbial Biology and Zurich–Basel Plant Science Center, University of Zurich, Zurich, Switzerland Mathias Scharmann, Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland Morgane Roth, GAFL INRAE, Montfavet, France
Reviewed by: Carolina Carrizo García, Instituto Multidisciplinario de Biologia Vegetal (IMBIV), Argentina; Rocio Santos-Gally, National Autonomous University of Mexico, Mexico; Gustavo Adolfo Silva-Arias, Technical University of Munich, Germany
Edited by: Adrien Sicard, Swedish University of Agricultural Sciences, Sweden
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2021.624442