Relationships and genetic diversity of endemic Elaphoglossum from St Helena |
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| Authors: | Antonia Eastwood Johannes Vogel Mary Gibby Quentin C B Cronk |
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| Institution: | (1) Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, UK;(2) Botany Department, Natural History Museum, Cromwell Road, London, SW7 5BD, UK;(3) Botanical Garden and Centre for Plant Research, University of British Columbia, 6804, SW Marine Drive, Vancouver, British Columbia, Canada |
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| Abstract: | Allozyme polymorphism was used 1) to investigate the relationships of three threatened species of Elaphoglossum from St Helena, E. nervosum, E. bifurcatum and E. dimorphum, and 2) to estimate levels of genetic diversity and its partitioning among populations. Despite showing morphological and ecological variation, the three species are closely related with high genetic identities. Evidence from one enzyme locus (Mdh-1) suggests that E. dimorphum is of hybrid origin involving E. nervosum and E. bifurcatum. Levels of genetic diversity were low in the three species, but comparable with other insular endemic angiosperms. Populations of E. nervosum and E. bifurcatum showed significant genetic differentiation, which should be taken into account in any conservation programme. |
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| Keywords: | Elaphoglossum St Helena isozyme analysis island endemics genetic diversity conservation |
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