Genetic differentiation during speciation in the Helianthus debilis complex [Sunflowers]

Techniques of horizontal starch gel electrophoresis were employed to estimate levels of genetic differentiation at various levels of evolutionary divergence in the Helianthus debilis complex of sunflowers. Local populations of the same taxon are genetically very similar (D = .010 ± .003). Subspecies...

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Bibliographic Details
Published in:Evolution 1983-11, Vol.37 (6), p.1119-1127
Main Author: Wain, R.P
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Alleles
Biological and medical sciences
Biological evolution
Biological taxonomies
Breeding
Evolutionary genetics
Fundamental and applied biological sciences. Psychology
Generalities
Generalities. Genetics. Plant material
Genetic distance
Genetic loci
Genetic variation
Genetics and breeding of economic plants
Genetics of eukaryotes. Biological and molecular evolution
Helianthus debilis
Keys
Plant material
Population genetics
Taxa
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Summary:Techniques of horizontal starch gel electrophoresis were employed to estimate levels of genetic differentiation at various levels of evolutionary divergence in the Helianthus debilis complex of sunflowers. Local populations of the same taxon are genetically very similar (D = .010 ± .003). Subspecies of the 'debilis' breeding assemblage (D = .080 ± .033) are eight times more differentiated than local populations. The semispecies 'debilis' and 'praecox' exhibit approximately the same degree of genetic differentiation as subspecies (D = .063 ± .015). The average genetic distance among the closely related species H. debilis and H. petiolaris increases to .142 ± .011, with the 'praecox' (D = .121 ± .000) and 'debilis' (D = .151 ± .012) breeding assemblages being approximately equally differentiated from H petiolaris. Finally, H. debilis and the distantly related species H radula are genetically quite distinct (D = .491 ± .032).
ISSN:0014-3820
1558-5646
DOI:10.1111/j.1558-5646.1983.tb00226.x