Biodiversity and Evolution of Plants

Research fields

Polyploidy and Hybridization

  • Polyploid differentiation in Veronica chamaedrys and V. spicata in the Balkan Peninsula
  • Polyploid speciation in Veronica cymbalaria in the Eastern Mediterranean
  • Origin of the diploid ancestors of polyploid Tragopogon species in North America
  • Consequences of hybridization of Verbascum nigrum and V. densiflorum in the area of Oldenburg
  • Threat of Sparganium angustifolium by hybridization with S. emersum
  • Consequences of hybridization of several Kale varieties
  • Differentiation of diploid and tetraploid Salicornia species in the Wadden Sea

Phylogeography and Conservation

  • Phylogeography and identification of forest refugial areas in V. chamaedrys agg.
  • Phylogeography and genetic diversity of alpine plants (V. saturejoidesV. thessalicaV. erinoides)
  • Phylogeography and hybridization in V. subg. Pseudolysimachium
  • Phylogeography and relict status of Wulfenia
  • Phylogeography of Veronica filiformis in the Caucasian-Anatolian area
  • Identifikation of pleistocene refugia of South American peat bog species
  • Sparganium angustifolium in Northwestern Germany
  • Distribution of Salicornia at the german Wadden Sea

Systematics of Veronica

  • Molecular systematics (ITS, various plastid markers, nuklear low copy genes)
  • Karyology (chromosome numbers, genome size)
  • Phytochemistry (iridoids, flavonoids)
  • Systematics of Australian Veronica
  • Account of Veronica for the Flora of North America

Evolution of annual life history

  • Correlation of selfing breeding system with annuality
  • Evolution of genome size in annuals

Breeding system evolution

  • Evolution of S-RNase in Plantaginaceae, especially in Veronica subgenus Pocilla
  • Evolution of pollen-ovule ratiosInvasion biology

Analysis of clonal distribution of Veronica filiformis in the invaded area