Extent and structure of genetic variation in two colonising Diplotaxis species (Brassicaceae) with contrasting breeding systems

Autor(en): Eschmann-Grupe, G
Neuffer, B 
Hurka, H
Stichwörter: colonisation Diplotaxis; CULTIVARS; Evolutionary Biology; F-statistics; FLOW; gene flow; genetic drift; isozymes; mating systems; Plant Sciences; population structure; POPULATIONS; RADISH; RAPD; VARIABILITY; WEED
Erscheinungsdatum: 2004
Herausgeber: SPRINGER WIEN
Volumen: 244
Ausgabe: 1-2
Startseite: 31
Seitenende: 43
Genetic variation within two closely related Diplotaxis species was studied as indicated by isozymes and RAPDs. These species differ in their mating systems, their life forms, and in their evolutionary history, but both are successful colonisers. The diploid perennial D. tenuifolia is an outbreeder, the allotetraploid annual to biennial D. muralis is predominantly selfing. D. muralis was nearly devoid of genetic variation due to a young phylogenetic age and/or population history. Estimations of genetic variation within D. tenuifolia and F-statistics indicated random mating at the species and population level and confirms obligate outbreeding. However, influence of genetic drift relative to gene flow was high and mirrors colonisation processes as indicated by considerable heterogeneity across populations and the lack of correlation between population divergence and geographic distance.
ISSN: 03782697
DOI: 10.1007/s00606-003-0077-z

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