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Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte
BACKGROUND: Mating system is one of the major determinants of intra- and interspecific genetic structure, but may vary within and between plant populations. Our study model included all known populations of Moehringia tommasinii (Caryophyllaceae), a narrow endemic plant inhabiting rock crevices in t...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10411015/ https://www.ncbi.nlm.nih.gov/pubmed/37553615 http://dx.doi.org/10.1186/s12870-023-04384-8 |
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author | Surina, Boštjan Balant, Manica Glasnović, Peter Radosavljević, Ivan Fišer, Živa Fujs, Nataša Castro, Sílvia |
author_facet | Surina, Boštjan Balant, Manica Glasnović, Peter Radosavljević, Ivan Fišer, Živa Fujs, Nataša Castro, Sílvia |
author_sort | Surina, Boštjan |
collection | PubMed |
description | BACKGROUND: Mating system is one of the major determinants of intra- and interspecific genetic structure, but may vary within and between plant populations. Our study model included all known populations of Moehringia tommasinii (Caryophyllaceae), a narrow endemic plant inhabiting rock crevices in the northwestern Adriatic, and some populations of co-occurring and widespread M. muscosa, an ecologically divergent relative with an overlapping flowering period. We performed reciprocal crosses within and between taxa and used molecular markers to assess the extent of gene flow within and between populations and taxa. Using coefficient of inbreeding, population size, seed weight, pollen-to-ovule ratio, and flower display size, we also looked for evidence of a selfing syndrome. RESULTS: A surprisingly high variation in mating systems was observed among populations of M. tommasinii. These populations exhibited genetic structuring, with their size positively correlated with both seed weight and pollen production. Although a selfing syndrome could not be confirmed as the majority of selfing resulted from allogamous treatments, the occurrence of selfing was notable. In the presence of M. muscosa, at a site where both species coexist closely, a distinct pattern of fruit production was observed in M. tommasinii following various pollination treatments. Molecular and morphometric data provided evidence of hybridization followed by local extinction at this site. CONCLUSIONS: Population size proved to be the most important factor affecting the mating system in genetically structured populations of M. tommasinii. Lighter seeds and lower pollen production observed in populations with pronounced selfing do not provide enough evidence for the selfing syndrome. Detected gene flow between M. tommasinii and the sympatric M. muscosa suggested weak reproductive barriers between the taxa, which could pose a conservation problems for the former species. Hybridization leading to local extinction may also resulted in floral polymorphism and disruption of mating patterns of M. tommasinii. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12870-023-04384-8. |
format | Online Article Text |
id | pubmed-10411015 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-104110152023-08-10 Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte Surina, Boštjan Balant, Manica Glasnović, Peter Radosavljević, Ivan Fišer, Živa Fujs, Nataša Castro, Sílvia BMC Plant Biol Research BACKGROUND: Mating system is one of the major determinants of intra- and interspecific genetic structure, but may vary within and between plant populations. Our study model included all known populations of Moehringia tommasinii (Caryophyllaceae), a narrow endemic plant inhabiting rock crevices in the northwestern Adriatic, and some populations of co-occurring and widespread M. muscosa, an ecologically divergent relative with an overlapping flowering period. We performed reciprocal crosses within and between taxa and used molecular markers to assess the extent of gene flow within and between populations and taxa. Using coefficient of inbreeding, population size, seed weight, pollen-to-ovule ratio, and flower display size, we also looked for evidence of a selfing syndrome. RESULTS: A surprisingly high variation in mating systems was observed among populations of M. tommasinii. These populations exhibited genetic structuring, with their size positively correlated with both seed weight and pollen production. Although a selfing syndrome could not be confirmed as the majority of selfing resulted from allogamous treatments, the occurrence of selfing was notable. In the presence of M. muscosa, at a site where both species coexist closely, a distinct pattern of fruit production was observed in M. tommasinii following various pollination treatments. Molecular and morphometric data provided evidence of hybridization followed by local extinction at this site. CONCLUSIONS: Population size proved to be the most important factor affecting the mating system in genetically structured populations of M. tommasinii. Lighter seeds and lower pollen production observed in populations with pronounced selfing do not provide enough evidence for the selfing syndrome. Detected gene flow between M. tommasinii and the sympatric M. muscosa suggested weak reproductive barriers between the taxa, which could pose a conservation problems for the former species. Hybridization leading to local extinction may also resulted in floral polymorphism and disruption of mating patterns of M. tommasinii. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12870-023-04384-8. BioMed Central 2023-08-09 /pmc/articles/PMC10411015/ /pubmed/37553615 http://dx.doi.org/10.1186/s12870-023-04384-8 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. |
spellingShingle | Research Surina, Boštjan Balant, Manica Glasnović, Peter Radosavljević, Ivan Fišer, Živa Fujs, Nataša Castro, Sílvia Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte |
title | Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte |
title_full | Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte |
title_fullStr | Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte |
title_full_unstemmed | Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte |
title_short | Population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte |
title_sort | population size as a major determinant of mating system and population genetic differentiation in a narrow endemic chasmophyte |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10411015/ https://www.ncbi.nlm.nih.gov/pubmed/37553615 http://dx.doi.org/10.1186/s12870-023-04384-8 |
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