Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands

Handle URI:
http://hdl.handle.net/10754/622946
Title:
Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
Authors:
Pailles, Yveline; Ho, Shwen; Pires, Inês S.; Tester, Mark A. ( 0000-0002-5085-8801 ) ; Negrão, Sónia; Schmöcke, Sandra M.
Abstract:
Endemic flora of the Galapagos Islands has adapted to thrive in harsh environmental conditions. The wild tomato species from the Galapagos Islands, Solanum cheesmaniae and S. galapagense, are tolerant to various stresses, and can be crossed with cultivated tomato. However, information about genetic diversity and relationships within and between populations is necessary to use these resources efficiently in plant breeding. In this study, we analyzed 3,974 polymorphic SNP markers, obtained through the genotyping-by-sequencing technique, DArTseq, to elucidate the genetic diversity and population structure of 67 accessions of Galapagos tomatoes (compared to two S. lycopersicum varieties and one S. pimpinellifolium accession). Two clustering methods, Principal Component Analysis and STRUCTURE, showed clear distinction between the two species and a subdivision in the S. cheesmaniae group corresponding to geographical origin and age of the islands. High genetic variation among the accessions within each species was suggested by the AMOVA. High diversity in the S. cheesmaniae group and its correlation with the islands of origin were also suggested. This indicates a possible influence of the movement of the islands, from west to east, on the gene flow. Additionally, the absence of S. galapagense populations in the eastern islands points to the species divergence occurring after the eastern islands became isolated. Based on these results, it can be concluded that the population structure of the Galapagos tomatoes collection partially explains the evolutionary history of both species, knowledge that facilitates exploitation of their genetic potential for the identification of novel alleles contributing to stress tolerance.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
Pailles Y, Ho S, Pires IS, Tester M, Negrão S, et al. (2017) Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands. Frontiers in Plant Science 8. Available: http://dx.doi.org/10.3389/fpls.2017.00138.
Publisher:
Frontiers Media SA
Journal:
Frontiers in Plant Science
Issue Date:
15-Feb-2017
DOI:
10.3389/fpls.2017.00138
Type:
Article
ISSN:
1664-462X
Sponsors:
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://journal.frontiersin.org/article/10.3389/fpls.2017.00138/full
Appears in Collections:
Articles; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorPailles, Yvelineen
dc.contributor.authorHo, Shwenen
dc.contributor.authorPires, Inês S.en
dc.contributor.authorTester, Mark A.en
dc.contributor.authorNegrão, Sóniaen
dc.contributor.authorSchmöcke, Sandra M.en
dc.date.accessioned2017-02-28T12:11:06Z-
dc.date.available2017-02-28T12:11:06Z-
dc.date.issued2017-02-15en
dc.identifier.citationPailles Y, Ho S, Pires IS, Tester M, Negrão S, et al. (2017) Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands. Frontiers in Plant Science 8. Available: http://dx.doi.org/10.3389/fpls.2017.00138.en
dc.identifier.issn1664-462Xen
dc.identifier.doi10.3389/fpls.2017.00138en
dc.identifier.urihttp://hdl.handle.net/10754/622946-
dc.description.abstractEndemic flora of the Galapagos Islands has adapted to thrive in harsh environmental conditions. The wild tomato species from the Galapagos Islands, Solanum cheesmaniae and S. galapagense, are tolerant to various stresses, and can be crossed with cultivated tomato. However, information about genetic diversity and relationships within and between populations is necessary to use these resources efficiently in plant breeding. In this study, we analyzed 3,974 polymorphic SNP markers, obtained through the genotyping-by-sequencing technique, DArTseq, to elucidate the genetic diversity and population structure of 67 accessions of Galapagos tomatoes (compared to two S. lycopersicum varieties and one S. pimpinellifolium accession). Two clustering methods, Principal Component Analysis and STRUCTURE, showed clear distinction between the two species and a subdivision in the S. cheesmaniae group corresponding to geographical origin and age of the islands. High genetic variation among the accessions within each species was suggested by the AMOVA. High diversity in the S. cheesmaniae group and its correlation with the islands of origin were also suggested. This indicates a possible influence of the movement of the islands, from west to east, on the gene flow. Additionally, the absence of S. galapagense populations in the eastern islands points to the species divergence occurring after the eastern islands became isolated. Based on these results, it can be concluded that the population structure of the Galapagos tomatoes collection partially explains the evolutionary history of both species, knowledge that facilitates exploitation of their genetic potential for the identification of novel alleles contributing to stress tolerance.en
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).en
dc.publisherFrontiers Media SAen
dc.relation.urlhttp://journal.frontiersin.org/article/10.3389/fpls.2017.00138/fullen
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectBiogeographyen
dc.subjectGalapagos Islandsen
dc.subjectGenetic diversityen
dc.subjectGenotyping-by-sequencingen
dc.subjectSolanum cheesmaniaeen
dc.subjectSolanum galapagenseen
dc.subjectTomatoen
dc.subjectWild relativesen
dc.titleGenetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islandsen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalFrontiers in Plant Scienceen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionGenomics of Plants Stress Unit, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa and Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugalen
dc.contributor.institutionDepartment of Biology and Center for Genomics and Systems Biology, New York University, New York, NY, United Statesen
kaust.authorPailles, Yvelineen
kaust.authorHo, Shwenen
kaust.authorTester, Mark A.en
kaust.authorNegrão, Sóniaen
kaust.authorSchmöcke, Sandra M.en
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