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

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...

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Autores principales: Pailles, Yveline, Ho, Shwen, Pires, Inês S., Tester, Mark, Negrão, Sónia, Schmöckel, Sandra M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5309213/
https://www.ncbi.nlm.nih.gov/pubmed/28261227
http://dx.doi.org/10.3389/fpls.2017.00138
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author Pailles, Yveline
Ho, Shwen
Pires, Inês S.
Tester, Mark
Negrão, Sónia
Schmöckel, Sandra M.
author_facet Pailles, Yveline
Ho, Shwen
Pires, Inês S.
Tester, Mark
Negrão, Sónia
Schmöckel, Sandra M.
author_sort Pailles, Yveline
collection PubMed
description 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.
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spelling pubmed-53092132017-03-03 Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands Pailles, Yveline Ho, Shwen Pires, Inês S. Tester, Mark Negrão, Sónia Schmöckel, Sandra M. Front Plant Sci Plant Science 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. Frontiers Media S.A. 2017-02-15 /pmc/articles/PMC5309213/ /pubmed/28261227 http://dx.doi.org/10.3389/fpls.2017.00138 Text en Copyright © 2017 Pailles, Ho, Pires, Tester, Negrão and Schmöckel. http://creativecommons.org/licenses/by/4.0/ This 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.
spellingShingle Plant Science
Pailles, Yveline
Ho, Shwen
Pires, Inês S.
Tester, Mark
Negrão, Sónia
Schmöckel, Sandra M.
Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
title Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
title_full Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
title_fullStr Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
title_full_unstemmed Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
title_short Genetic Diversity and Population Structure of Two Tomato Species from the Galapagos Islands
title_sort genetic diversity and population structure of two tomato species from the galapagos islands
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5309213/
https://www.ncbi.nlm.nih.gov/pubmed/28261227
http://dx.doi.org/10.3389/fpls.2017.00138
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