Speciation inVirgilia (Fabaceae): Allopatric divergence followed by introgression? |
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| Authors: | Michelle van der Bank F H van der Bank B -E van Wyk |
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| Institution: | (1) Department of Botany, Rand Afrikaans University, Auckland Park, P.O. Box 524, 2006 Johannesburg, Republic of South Africa;(2) Research Unit for Aquatic and Terrestrial Ecosystems, Rand Afrikaans University, Auckland Park, P.O. Box 524, 2006 Johannesburg, Republic of South Africa |
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| Abstract: | Levels of variation revealed by starch gel-electrophoresis were compared with morphological and chemical variation within and among the species and subspecies ofVirgilia:V. oroboides subsp.oroboides, V. oroboides subsp.ferruginea andV. divaricata. The data sets exhibited concordance in that all point to a very close relationship between the taxa. Differences are mostly quantitative and an overlapping east-west gradient of character variation is indicated. Analysis of morphological and chemical characters showed thatV. oroboides subsp.ferruginea andV. divaricata are relatively distinct, whereas allozyme analysis indicated a high degree of genetic similarity among populations of these two taxa. The observed pattern of variation suggests relatively recent speciation with subsequent introgressive hybridisation resulting in a geographical and ecological gradient. |
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| Keywords: | Fabaceae Podalyrieae Virgilia Biochemical genetics electrophoresis genetic distance speciation |
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