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Genetic Differentiation During Speciation in the Helianthus debilis Complex

Richard P. Wain
Evolution
Vol. 37, No. 6 (Nov., 1983), pp. 1119-1127
DOI: 10.2307/2408835
Stable URL: http://www.jstor.org/stable/2408835
Page Count: 9
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Genetic Differentiation During Speciation in the Helianthus debilis Complex
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Abstract

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).

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