Molecular evidence for hybridization in the aquatic plant Limosella on sub-Antarctic Marion Island

dc.contributor.authorChau, John H.
dc.contributor.authorGreve, Michelle
dc.contributor.authorJansen van Vuuren, Bettine
dc.date.accessioned2022-06-28T05:27:05Z
dc.date.available2022-06-28T05:27:05Z
dc.date.issued2021
dc.description.abstractDNA sequence data have become a crucial tool in assessing the relationship between morphological variation and genetic and taxonomic groups, including in the Antarctic biota. Morphologically distinct populations of submersed aquatic vascular plants were observed on sub-Antarctic Marion Island, potentially representing the two species of such plants listed in the island's flora, Limosella australis R.Br. (Scrophulariaceae) and Ranunculus moseleyi Hook.f. (Ranunculaceae). To confirm their taxonomic identity, we sequenced a nuclear locus (internal transcribed spacer; ITS) and two plastid loci (trnL-trnF, rps16) from three specimens collected on Marion Island and compared the sequences with those in public sequence databases. For all three loci, sequences from the Marion Island specimens were nearly identical despite morphological dissimilarity, and phylogenetic analyses resolved them to a position in Limosella. In phylogenetic trees and comparisons of species-specific sequence polymorphisms, the Marion Island specimens were closest to a clade comprising Limosella aquatica L., L. curdieana F.Muell. and L. major Diels for ITS and closest to L. australis for the plastid loci. Cytonuclear discordance suggests a history of hybridization or introgression, which may have consequences for morphological variability and ecological adaptation.en_US
dc.description.departmentPlant Production and Soil Scienceen_US
dc.description.librarianam2022en_US
dc.description.sponsorshipThe National Research Foundationen_US
dc.description.urihttp://journals.cambridge.org/action/displayJournal?jid=ANSen_US
dc.identifier.citationChau, J.H., Greve, M., Jansen van Vuuren, B. 2021, 'Molecular evidence for hybridization in the aquatic plant Limosella on sub-Antarctic Marion Island', Antarctic Science, vol. 33, no. 3, pp. 243-251.en_US
dc.identifier.issn0954-1020 (print)
dc.identifier.issn1365-2079 (online)
dc.identifier.other10.1017/S0954102021000079
dc.identifier.urihttps://repository.up.ac.za/handle/2263/85969
dc.language.isoenen_US
dc.publisherCambridge University Pressen_US
dc.rights© The Author(s), 2021. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence.en_US
dc.subjectCytonuclear discordanceen_US
dc.subjectGene tree incongruenceen_US
dc.subjectIntrogressionen_US
dc.subjectLimosella aquaticaen_US
dc.subjectLimosella australisen_US
dc.subjectRanunculus moseleyien_US
dc.titleMolecular evidence for hybridization in the aquatic plant Limosella on sub-Antarctic Marion Islanden_US
dc.typeArticleen_US

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