Microsatellite analysis of four similar Euphrasia (Orobanchaceae) species changes the traditional view of this group
Methods and key results – We conducted a survey of the genetical and morphological diversity in 42 populations, which were assigned to four species based on morphology. Using microsatellite analysis, we discovered three genetic groups within our data set. Whereas E. stricta and E. nemorosa comprised separate clusters, most of the early-flowering populations identified as E. coerulea and E. slovaca formed one common cluster. Traditional characters such as corolla length, branching and the presence of a long awn on the bracts were identified in multivariate analyses as the most reliable morphological differences between genetically defined E. stricta and E. nemorosa. Early-flowering populations differed generally by their low number of nodes. In spite of their genetic similarity, they differed morphologically between the two geographical areas. In spite of the assumption of different selfing rates correlated with corolla size, differences in genetic diversity among populations with different corolla sizes were not found.
Conclusions – There are three well supported groups in the studied dataset of Euphrasia species. Delimitation of E. stricta and E. nemorosa is in concert with traditional views, but delimitation of the third group changes the traditional distinction of two mostly early-flowering species in the study area.
Document Type: Regular Paper
Publication date: 01 March 2016
Plant Ecology and Evolution (a continuation of Belgian Journal of Botany, incorporating Systematics and Geography of Plants) is an international journal devoted to ecology, phylogenetics and systematics of all 'plant' groups in the traditional sense (including algae, cyanobacteria, fungi, myxomycetes), also covering related fields such as comparative and developmental morphology, conservation biology, ecophysiology, evolution, phytogeography, pollen and spores, population biology, and vegetation studies. It is published by the Royal Botanical Society of Belgium and the Botanic Garden Meise and contains original research papers, review articles, checklists, short communications and book reviews.
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