ArticleAnnals of botany2013
High ploidy diversity and distinct patterns of cytotype distribution in a widespread species of Oxalis in the Greater Cape Floristic Region.
Article in Annals of botany, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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15 citing papers in PubMed.
- Polyploidy meets the Cape: Evolutionary dynamics ofPlant diversity · 2026Article
- Oryzalin-induced polyploidy inFrontiers in plant science · 2025Article
- Diploid and tetraploid cytotypes of the flagship Cape species Dicerothamnus rhinocerotis (Asteraceae): variation in distribution, ecological niche, morphology and genetics.Annals of botany · 2024Article
- Morphological and environmental differentiation as prezygotic reproductive barriers between parapatric and allopatric Campanula rotundifolia agg. cytotypes.Annals of botany · 2023Article
- Ocbil Theory as a Potential Unifying Framework for Investigating Narrow Endemism in Mediterranean Climate Regions.Plants (Basel, Switzerland) · 2023Article
- Genetic diversity and karyotype of Pitcairnia azouryi: an endangered species of Bromeliaceae endemic to Atlantic Forest inselbergs.Molecular biology reports · 2020Article
- Intricate Distribution Patterns of Six Cytotypes ofFrontiers in plant science · 2020Article
- Polyploidy in the Conifer GenusFrontiers in plant science · 2019Article
- A Target Capture-Based Method to Estimate Ploidy From Herbarium Specimens.Frontiers in plant science · 2019Article
- Distribution and ecological segregation on regional and microgeographic scales of the diploidPeerJ · 2018Article
- Microsatellite primers for a species of South African everlasting daisy (Helichrysum odoratissimum; Gnaphalieae, Asteraceae).Applications in plant sciences · 2016Article
- A high frequency of allopolyploid speciation in the gymnospermous genus Ephedra and its possible association with some biological and ecological features.Molecular ecology · 2016Article
- Floral traits and pollination ecology of European Arum hybrids.Oecologia · 2016Article
- Cytotype diversity and genome size variation in Knautia (Caprifoliaceae, Dipsacoideae).BMC evolutionary biology · 2015Article
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11 authors.
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Abstract
BACKGROUND AND
aimsGenome duplication is widely acknowledged as a major force in the evolution of angiosperms, although the incidence of polyploidy in different floras may differ dramatically. The Greater Cape Floristic Region of southern Africa is one of the world's biodiversity hotspots and is considered depauperate in polyploids. To test this assumption, ploidy variation was assessed in a widespread member of the largest geophytic genus in the Cape flora: Oxalis obtusa.
methodsDNA flow cytometry complemented by confirmatory chromosome counts was used to determine ploidy levels in 355 populations of O. obtusa (1014 individuals) across its entire distribution range. Ecological differentiation among cytotypes was tested by comparing sets of vegetation and climatic variables extracted for each locality. KEY
resultsThree majority (2x, 4x, 6x) and three minority (3x, 5x, 8x) cytotypes were detected in situ, in addition to a heptaploid individual originating from a botanical garden. While single-cytotype populations predominate, 12 mixed-ploidy populations were also found. The overall pattern of ploidy level distribution is quite complex, but some ecological segregation was observed. Hexaploids are the most common cytotype and prevail in the Fynbos biome. In contrast, tetraploids dominate in the Succulent Karoo biome. Precipitation parameters were identified as the most important climatic variables associated with cytotype distribution.
conclusionsAlthough it would be premature to make generalizations regarding the role of genome duplication in the genesis of hyperdiversity of the Cape flora, the substantial and unexpected ploidy diversity in Oxalis obtusa is unparalleled in comparison with any other cytologically known native Cape plant species. The results suggest that ploidy variation in the Greater Cape Floristic Region may be much greater than currently assumed, which, given the documented role of polyploidy in speciation, has direct implications for radiation hypotheses in this biodiversity hotspot.
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