Island species radiation and karyotypic stasis in <Emphasis Type="Italic">Pachycladon</Emphasis>allopolyploids |
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Authors: | Terezie Mandáková Peter B Heenan Martin A Lysak |
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Institution: | 1.Department of Functional Genomics and Proteomics,Masaryk University, and CEITEC, Masaryk University,Brno,Czech Republic;2.Allan Herbarium, Landcare Research,Lincoln,New Zealand |
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Abstract: | Background
Pachycladon (Brassicaceae, tribe Camelineae) is a monophyletic genus of ten morphologically and ecogeographically differentiated, and
presumably allopolyploid species occurring in the South Island of New Zealand and in Tasmania. All Pachycladon species possess ten chromosome pairs (2n = 20). The feasibility of comparative chromosome painting (CCP) in crucifer species
allows the origin and genome evolution in this genus to be elucidated. We focus on the origin and genome evolution of Pachycladon as well as on its genomic relationship to other crucifer species, particularly to the allopolyploid Australian Camelineae
taxa. As species radiation on islands is usually characterized by chromosomal stasis, i.e. uniformity of chromosome numbers/ploidy
levels, the role of major karyotypic reshuffling during the island adaptive and species radiation in Pachycladon is investigated through whole-genome CCP analysis. |
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