Resolving taxonomic complexity in diploid and tetraploid British eyebrights (Euphrasia)

Taxonomically complex groups (TCGs) are difficult to assign to species. Analyses of genetic structure have the potential to determine distinct species and improve taxonomic delimitation. Euphrasia provides a good non-model plant system for investigating species differences in TCGs. Genotyping-by-sequecing of diverse UK eyebright samples revealed both species and geographic differences: 1) northern E. micrantha is genetically distinctive, indicating a different colonization history. 2) geography plays an important role. We hypothesized that this is related to geographic differentiation caused by selfing / local hybridisation; 3) closely related species showed low species-level differentiation with a few outlier regions, these regions might underlie species differences.

DING Yanqian – Poster 2021

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