dc.contributor.author	MATOLWENI, LUZUKO ORLYN
dc.contributor.author	BALKWILL, KEVIN
dc.contributor.author	MCLELLAN, TRACY
dc.date.accessioned	2016-03-31T12:55:57Z
dc.date.available	2016-03-31T12:55:57Z
dc.date.issued	2012-02-03
dc.description	Begonia dregei and B. homonyma (Begoniaceae), rare plants endemic to coastal forests of eastern South Africa, are two closely related species with high levels of variation among populations in the shape of leaves. Distribution of genetic variation and genetic relatedness were investigated in 12 populations of B. dregei and seven of B. homonyma using polyacrylamide gel electrophoresis. Twelve of the 15 enzyme loci examined were polymorphic, but only seven loci were polymorphic within at least one population. Genetic diversity measures indicated that the among-population gene differentiation represents >90% of the total genetic component in both species considered individually or combined. This indicated restricted gene ﬂow, consistent with the limited dispersal abilities of Begonia generally and the ancient separation of isolated forest patches. Genetic distances among populations are much higher than usually found within species. Allozyme data provide no support for the recognition of B. dregei and B. homonyma as distinct species.	en_ZA
dc.description.abstract	Excellent models for the study of evolutionary pro¬cesses are often provided by taxa that pose the greatest problems in systematics (Wolf, Soltis, and Soltis, 1991). Endemic plants provide a superb tool for studying the dynamic processes of speciation and evolution, particu¬larly island endemic plants (Ito and Ono, 1990; Aradya, Mueller-Dombois, and Ranker, 1991; Barrett, 1996). Ev¬idence of most evolutionary events that formed continen¬tal biota has been lost because such biota are so ancient (Carson, 1987). Complex patterns of variation may blur species boundaries and lead to taxonomic complexity.	en_ZA
dc.identifier.uri	http://hdl.handle.net/10539/20145
dc.language.iso	en	en_ZA
dc.subject	African coastal forests	en_ZA
dc.subject	Begonia	en_ZA
dc.subject	Begoniaceae	en_ZA
dc.subject	genetic drift	en_ZA
dc.subject	genetic population structure	en_ZA
dc.subject	habitat frag¬mentation	en_ZA
dc.title	GENETIC DIVERSITY AND GENE FLOW IN THE MORPHOLOGICALLY VARIABLE, RARE ENDEMICS BEGONIA DREGEI AND BEGONIA HOMONYMA (BEGONIACEAE)	en_ZA
dc.type	Article	en_ZA

GENETIC DIVERSITY AND GENE FLOW IN THE MORPHOLOGICALLY VARIABLE, RARE ENDEMICS BEGONIA DREGEI AND BEGONIA HOMONYMA (BEGONIACEAE)

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