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Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution
Reticulate evolution is considered to be among the main mechanisms of plant evolution, often leading to the establishment of new species. However, complex evolutionary scenarios result in a challenging definition of evolutionary and taxonomic units. In this study, we aimed to examine the evolutionar...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Oxford University Press
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5463600/ https://www.ncbi.nlm.nih.gov/pubmed/28122738 http://dx.doi.org/10.1093/aobpla/plx002 |
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author | Nierbauer, Kai Uwe Paule, Juraj Zizka, Georg |
author_facet | Nierbauer, Kai Uwe Paule, Juraj Zizka, Georg |
author_sort | Nierbauer, Kai Uwe |
collection | PubMed |
description | Reticulate evolution is considered to be among the main mechanisms of plant evolution, often leading to the establishment of new species. However, complex evolutionary scenarios result in a challenging definition of evolutionary and taxonomic units. In this study, we aimed to examine the evolutionary origin and revise the species status of Campanula baumgartenii, a rare endemic species from the polyploid complex Campanula section Heterophylla. Morphometry, flow cytometric ploidy estimation, amplified fragment length polymorphisms (AFLPs), as well as chloroplast and nuclear DNA sequence markers were used to assess the morphological and genetic differentiation among C. baumgartenii, Campanula rotundifolia and other closely related taxa. Tetra- and hexaploid C. baumgartenii is morphologically and molecularly (AFLP) differentiated from sympatric C. rotundifolia. Contrasting signals from nuclear (ITS) and chloroplast (trnL-rpl32) markers suggest a hybrid origin of C. baumgartenii with C. rotundifolia and a taxon related to the alpine Campanula scheuchzeri as ancestors. Additionally, hexaploid C. baumgartenii currently hybridizes with co-occurring tetraploid C. rotundifolia resulting in pentaploid hybrids, for which C. baumgartenii serves as both seed and pollen donor. Based on the molecular and morphological differentiation, we propose to keep C. baumgartenii as a separate species. This study exemplifies that detailed population genetic studies can provide a solid basis for taxonomic delimitation within Campanula section Heterophylla as well as for sound identification of conservation targets. |
format | Online Article Text |
id | pubmed-5463600 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-54636002017-06-14 Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution Nierbauer, Kai Uwe Paule, Juraj Zizka, Georg AoB Plants Research Article Reticulate evolution is considered to be among the main mechanisms of plant evolution, often leading to the establishment of new species. However, complex evolutionary scenarios result in a challenging definition of evolutionary and taxonomic units. In this study, we aimed to examine the evolutionary origin and revise the species status of Campanula baumgartenii, a rare endemic species from the polyploid complex Campanula section Heterophylla. Morphometry, flow cytometric ploidy estimation, amplified fragment length polymorphisms (AFLPs), as well as chloroplast and nuclear DNA sequence markers were used to assess the morphological and genetic differentiation among C. baumgartenii, Campanula rotundifolia and other closely related taxa. Tetra- and hexaploid C. baumgartenii is morphologically and molecularly (AFLP) differentiated from sympatric C. rotundifolia. Contrasting signals from nuclear (ITS) and chloroplast (trnL-rpl32) markers suggest a hybrid origin of C. baumgartenii with C. rotundifolia and a taxon related to the alpine Campanula scheuchzeri as ancestors. Additionally, hexaploid C. baumgartenii currently hybridizes with co-occurring tetraploid C. rotundifolia resulting in pentaploid hybrids, for which C. baumgartenii serves as both seed and pollen donor. Based on the molecular and morphological differentiation, we propose to keep C. baumgartenii as a separate species. This study exemplifies that detailed population genetic studies can provide a solid basis for taxonomic delimitation within Campanula section Heterophylla as well as for sound identification of conservation targets. Oxford University Press 2017-01-25 /pmc/articles/PMC5463600/ /pubmed/28122738 http://dx.doi.org/10.1093/aobpla/plx002 Text en © The Authors 2017. Published by Oxford University Press on behalf of the Annals of Botany Company. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Nierbauer, Kai Uwe Paule, Juraj Zizka, Georg Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution |
title | Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution |
title_full | Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution |
title_fullStr | Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution |
title_full_unstemmed | Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution |
title_short | Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution |
title_sort | heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5463600/ https://www.ncbi.nlm.nih.gov/pubmed/28122738 http://dx.doi.org/10.1093/aobpla/plx002 |
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