학술논문
Relationships and genetic diversity of endemic Elaphoglossum from St Helena.
Document Type
Article
Author
Source
Subject
*ELAPHOGLOSSUM
*GENETIC polymorphisms
*ENDANGERED species
*ANGIOSPERMS
*PLANT morphology
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Language
ISSN
0378-2697
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. [ABSTRACT FROM AUTHOR]