Universität zu Köln

Beddows, Ian, Reddy, Aparna, Kloesges, Thorsten and Rose, Laura E. (2017). Population Genomics in Wild Tomatoes-The Interplay of Divergence and Admixture. Genome Biol. Evol., 9 (11). S. 3023 - 3039. OXFORD: OXFORD UNIV PRESS. ISSN 1759-6653

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Abstract

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 data set 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, Solanum peruvianum, has two genetic and geographical subpopulations, while its sister species, Solanum chilense, has distinct coastal populations and reduced heterozygosity indicating a recent expansion south following speciation from S. peruvianum circa 1.25 Ma. Discontinuous populations west of 72 degrees 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Beddows, Ian UNSPECIFIED UNSPECIFIED UNSPECIFIED Reddy, Aparna UNSPECIFIED UNSPECIFIED UNSPECIFIED Kloesges, Thorsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Rose, Laura E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-211667
DOI:	10.1093/gbe/evx224
Journal or Publication Title:	Genome Biol. Evol.
Volume:	9
Number:	11
Page Range:	S. 3023 - 3039
Date:	2017
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1759-6653
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SOLANUM SECTION LYCOPERSICON; HYBRID SPECIATION; NATURAL-SELECTION; DNA-CONTENT; EVOLUTIONARY; GENETICS; HYBRIDIZATION; POLYMORPHISM; SOLANACEAE; HISTORY Multiple languages Evolutionary Biology; Genetics & Heredity Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21166