Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La Soie
<p>Abstract</p> <p>Background</p> <p>Hybridisation is presumed to be an important mechanism in plant speciation and a creative evolutionary force often accompanied by polyploidisation and in some cases by apomixis. The <it>Potentilla collina</it> group const...
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| Format: | Article |
| Language: | English |
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BMC
2012-08-01
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| Series: | BMC Evolutionary Biology |
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| Online Access: | http://www.biomedcentral.com/1471-2148/12/132 |
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| author | Paule Juraj Scherbantin Antonia Dobeš Christoph |
| author_facet | Paule Juraj Scherbantin Antonia Dobeš Christoph |
| author_sort | Paule Juraj |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Hybridisation is presumed to be an important mechanism in plant speciation and a creative evolutionary force often accompanied by polyploidisation and in some cases by apomixis. The <it>Potentilla collina</it> group constitutes a particularly suitable model system to study these phenomena as it is morphologically extensively variable, exclusively polyploid and expresses apomixis. In the present study, the alpine taxon <it>Potentilla alpicola</it> has been chosen in order to study its presumed hybrid origin, identify underlying evolutionary processes and infer the discreteness or taxonomic value of hybrid forms.</p> <p>Results</p> <p>Combined analysis of AFLP, cpDNA sequences and ploidy level variation revealed a hybrid origin of the <it>P. alpicola</it> populations from South Tyrol (Italy) resulting from crosses between <it>P. pusilla</it> and two cytotypes of <it>P. argentea</it>. Hybrids were locally sympatric with at least one of the parental forms. Three lineages of different evolutionary origin comprising two ploidy levels were identified within <it>P. alpicola.</it> The lineages differed in parentage and the complexity of the evolutionary process. A geographically wide-spread lineage thus contrasted with locally distributed lineages of different origins. Populations of <it>P. collina</it> studied in addition, have been regarded rather as recent derivatives of the hexaploid <it>P. argentea</it>. The observation of clones within both <it>P. alpicola</it> and <it>P. collina</it> suggested a possible apomictic mode of reproduction.</p> <p>Conclusions</p> <p>Different hybridisation scenarios taking place on geographically small scales resulted in viable progeny presumably stabilised by apomixis. The case study of <it>P. alpicola</it> supports that these processes played a significant role in the creation of polymorphism in the genus <it>Potentilla</it>. However, multiple origin of hybrids and backcrossing are considered to produce a variety of evolutionary spontaneous forms existing aside of reproductively stabilised, established lineages.</p> |
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| institution | Directory Open Access Journal |
| issn | 1471-2148 |
| language | English |
| last_indexed | 2024-12-19T17:30:42Z |
| publishDate | 2012-08-01 |
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| spelling | doaj.art-d0774e00e0664dab9fed65928f7399992022-12-21T20:12:28ZengBMCBMC Evolutionary Biology1471-21482012-08-0112113210.1186/1471-2148-12-132Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La SoiePaule JurajScherbantin AntoniaDobeš Christoph<p>Abstract</p> <p>Background</p> <p>Hybridisation is presumed to be an important mechanism in plant speciation and a creative evolutionary force often accompanied by polyploidisation and in some cases by apomixis. The <it>Potentilla collina</it> group constitutes a particularly suitable model system to study these phenomena as it is morphologically extensively variable, exclusively polyploid and expresses apomixis. In the present study, the alpine taxon <it>Potentilla alpicola</it> has been chosen in order to study its presumed hybrid origin, identify underlying evolutionary processes and infer the discreteness or taxonomic value of hybrid forms.</p> <p>Results</p> <p>Combined analysis of AFLP, cpDNA sequences and ploidy level variation revealed a hybrid origin of the <it>P. alpicola</it> populations from South Tyrol (Italy) resulting from crosses between <it>P. pusilla</it> and two cytotypes of <it>P. argentea</it>. Hybrids were locally sympatric with at least one of the parental forms. Three lineages of different evolutionary origin comprising two ploidy levels were identified within <it>P. alpicola.</it> The lineages differed in parentage and the complexity of the evolutionary process. A geographically wide-spread lineage thus contrasted with locally distributed lineages of different origins. Populations of <it>P. collina</it> studied in addition, have been regarded rather as recent derivatives of the hexaploid <it>P. argentea</it>. The observation of clones within both <it>P. alpicola</it> and <it>P. collina</it> suggested a possible apomictic mode of reproduction.</p> <p>Conclusions</p> <p>Different hybridisation scenarios taking place on geographically small scales resulted in viable progeny presumably stabilised by apomixis. The case study of <it>P. alpicola</it> supports that these processes played a significant role in the creation of polymorphism in the genus <it>Potentilla</it>. However, multiple origin of hybrids and backcrossing are considered to produce a variety of evolutionary spontaneous forms existing aside of reproductively stabilised, established lineages.</p>http://www.biomedcentral.com/1471-2148/12/132AFLPApomixiscpDNAHybridisationIntrogressionPolyploidyReproduction mode<it>Potentilla</it>Rosaceae |
| spellingShingle | Paule Juraj Scherbantin Antonia Dobeš Christoph Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La Soie BMC Evolutionary Biology AFLP Apomixis cpDNA Hybridisation Introgression Polyploidy Reproduction mode <it>Potentilla</it> Rosaceae |
| title | Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La Soie |
| title_full | Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La Soie |
| title_fullStr | Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La Soie |
| title_full_unstemmed | Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La Soie |
| title_short | Implications of hybridisation and cytotypic differentiation in speciation assessed by AFLP and plastid haplotypes - a case study of <it>Potentilla alpicola</it> La Soie |
| title_sort | implications of hybridisation and cytotypic differentiation in speciation assessed by aflp and plastid haplotypes a case study of it potentilla alpicola it la soie |
| topic | AFLP Apomixis cpDNA Hybridisation Introgression Polyploidy Reproduction mode <it>Potentilla</it> Rosaceae |
| url | http://www.biomedcentral.com/1471-2148/12/132 |
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