Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation
Abstract Aim The objective was to find direct genetic evidence supporting introgressive hybridization between tetraploid tree birch ( Betula pubescens ) and diploid dwarf birch ( B. nana ), via triploid hybrids, and to investigate an association between the introgression and phylogeographical distri...
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crwiley:10.1111/j.1365-2699.2010.02353.x 2024-06-23T07:51:47+00:00 Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation Thórsson, Æ. Th. Pálsson, S. Lascoux, M. Anamthawat‐Jónsson, K. 2010 http://dx.doi.org/10.1111/j.1365-2699.2010.02353.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2699.2010.02353.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2699.2010.02353.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Biogeography volume 37, issue 11, page 2098-2110 ISSN 0305-0270 1365-2699 journal-article 2010 crwiley https://doi.org/10.1111/j.1365-2699.2010.02353.x 2024-06-11T04:49:25Z Abstract Aim The objective was to find direct genetic evidence supporting introgressive hybridization between tetraploid tree birch ( Betula pubescens ) and diploid dwarf birch ( B. nana ), via triploid hybrids, and to investigate an association between the introgression and phylogeographical distribution of Icelandic birch. Location Samples were collected from 463 trees in 12 woodlands in Iceland and eight locations in Norway, Sweden, Scotland and Greenland. Methods Ploidy status of individual trees was determined by chromosome counting. Variation in the chloroplast genome was assessed using polymerase chain reaction‐restriction fragment length polymorphism. The geographical distribution of the haplotypes was mapped. The haplotype variation and introgression ratios ( IG) were analysed statistically. Results Thirteen haplotypes were identified among Icelandic samples. The most common haplotype (T, 49% occurrence) was present in all ploidy groups and in all woodlands. All common haplotypes were shared between the triploid group and the parental species, indicating introgressive hybridization. This was supported by the statistical analysis of IG indices and the variation components. Considerable differences existed among samples, shaped by isolation by distance and local introgression. An east–west phylogeographical distribution in Iceland was observed. Main conclusions Despite extensive introgression across species and ploidy levels, a biogeographical pattern has been observed, and this may indicate different population histories or multiple origins of Icelandic birch. The chloroplast haplotype diversity found in Iceland resembles that found in birch populations from northern Scandinavia. Article in Journal/Newspaper Betula nana Dwarf birch Greenland Iceland Wiley Online Library Greenland Norway Journal of Biogeography 37 11 2098 2110 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Aim The objective was to find direct genetic evidence supporting introgressive hybridization between tetraploid tree birch ( Betula pubescens ) and diploid dwarf birch ( B. nana ), via triploid hybrids, and to investigate an association between the introgression and phylogeographical distribution of Icelandic birch. Location Samples were collected from 463 trees in 12 woodlands in Iceland and eight locations in Norway, Sweden, Scotland and Greenland. Methods Ploidy status of individual trees was determined by chromosome counting. Variation in the chloroplast genome was assessed using polymerase chain reaction‐restriction fragment length polymorphism. The geographical distribution of the haplotypes was mapped. The haplotype variation and introgression ratios ( IG) were analysed statistically. Results Thirteen haplotypes were identified among Icelandic samples. The most common haplotype (T, 49% occurrence) was present in all ploidy groups and in all woodlands. All common haplotypes were shared between the triploid group and the parental species, indicating introgressive hybridization. This was supported by the statistical analysis of IG indices and the variation components. Considerable differences existed among samples, shaped by isolation by distance and local introgression. An east–west phylogeographical distribution in Iceland was observed. Main conclusions Despite extensive introgression across species and ploidy levels, a biogeographical pattern has been observed, and this may indicate different population histories or multiple origins of Icelandic birch. The chloroplast haplotype diversity found in Iceland resembles that found in birch populations from northern Scandinavia. |
format |
Article in Journal/Newspaper |
author |
Thórsson, Æ. Th. Pálsson, S. Lascoux, M. Anamthawat‐Jónsson, K. |
spellingShingle |
Thórsson, Æ. Th. Pálsson, S. Lascoux, M. Anamthawat‐Jónsson, K. Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation |
author_facet |
Thórsson, Æ. Th. Pálsson, S. Lascoux, M. Anamthawat‐Jónsson, K. |
author_sort |
Thórsson, Æ. Th. |
title |
Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation |
title_short |
Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation |
title_full |
Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation |
title_fullStr |
Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation |
title_full_unstemmed |
Introgression and phylogeography of Betula nana(diploid), B. pubescens(tetraploid) and their triploid hybrids in Iceland inferred from cpDNA haplotype variation |
title_sort |
introgression and phylogeography of betula nana(diploid), b. pubescens(tetraploid) and their triploid hybrids in iceland inferred from cpdna haplotype variation |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1365-2699.2010.02353.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2699.2010.02353.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2699.2010.02353.x |
geographic |
Greenland Norway |
geographic_facet |
Greenland Norway |
genre |
Betula nana Dwarf birch Greenland Iceland |
genre_facet |
Betula nana Dwarf birch Greenland Iceland |
op_source |
Journal of Biogeography volume 37, issue 11, page 2098-2110 ISSN 0305-0270 1365-2699 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2699.2010.02353.x |
container_title |
Journal of Biogeography |
container_volume |
37 |
container_issue |
11 |
container_start_page |
2098 |
op_container_end_page |
2110 |
_version_ |
1802642924121358336 |