Phanerogams II

Research

Evolution of dogroses (Rosa L. sect. Caninae (DC.) Ser.)

A unique reproductive system – the Canina meiosis – evolved in allopolyploid dogroses. This mechanism allows for sexual reproduction despite the pentaploid somatic ploidy level of the plants. In our collaboration project with A. Kovařík of the Czech Academy of Sciences we explore the inheritance of sub-genomes in hybrids and investigate their behaviour during canina meiosis using fluorescence in situ hybridization and comparative genomics.

Besides their allopolyploid origin dogroses hybridize frequently. Using population genetic approaches we investigate the frequency of hybridization events and how hybrids become established in natural populations.

Cooperation partners

Aleš Kovařík, Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno

Volker Wissemann, AG Systematische Botanik, Justus-Liebig Universität Gießen

Financed by the German Research Foundation

 

 

Determination aids for the flora of Germany

Rothmaler – Field Flora of Germany

From 2010 onwards, the field flora follows a new concept. The Rothmaler flora still consists of 3 volumes (plus the volume on ornamentals) but contributions to these volumes have been changed. The base-line edition has been amended by including the majority of taxonomically critical taxa formerly only treated in the so-called critical edition.

The current 21st edition represents a revised version without major changes in content compared to the 20th edition of 2010.

The Atlas volume has been updated by including more than 200 new species; more than 50 existing drawings were revised. Both text and atlas were restructured with respect to current taxonomy; the new systematic arrangement follows concepts developed by APG III.

In 2016 the supplementary volume has been completely redesigned, and now only covers those critical taxa which have not been included in detail in the base-line edition (Ranunculus auricomus, Sorbus, Rubus, Taraxacum u. Hieracium laevigatum agg.). With this publication, the Rothmaler flora is now completely available in the new structure.

In addition to the printed volume we offer open access to a virtual herbarium of critical plant taxa in Germany.

Collaborators

Institute of Botany – Technical University Dresden

Geobotany – Martin Luther University Halle-Wittenberg

Department of Botany – Senckenberg Museum of Natural History Görlitz

Diversity and relationships of Central european strawberries (Fragaria L.)

Central European strawberries differ strongly in their generative reproductive system and ploidy: Fragaria moschata is dioecious (2n = 6x = 42), F. viridis (2n = 2x = 14) is hermaphroditic and self-incompatible and F. vesca ssp. vesca (2x) is also hermaphroditic but self-compatible. In a population genetic study we investigate the effects of the generative reproductive system and ploidy on genetic diversity of populations and the extent of hybridisation.

The hexaploid F. moschata presumably arose by hybridisation from di- or tetraploid ancestral species. Using molecular and cytogenetic methods we explore the allopolyploid origin of this species.

Until the 19th century F. moschata had been widely cultivated in Central Europe but is nowadays nearly completely replaced by modern garden strawberries (Fragaria ×ananassa). We characterize F. moschata populations escaped from cultivation in comparison to accessions of the wild species repository „Professor Staudt Collection“ of the company Hansabred in Dresden by applying microsatellite markers.

Sebastian Buschmann (PhD student)

Donam Tushabe (master student)

Cooperation partners

PD. Dr. K. Olbricht, Hansabred GmbH & Co. KG, Dresden

Prof. Dr. Ch. Neinhuis, Institut für Botanik TU Dresden

We thank the Gesellschaft zur Erforschung der Flora Deutschlands (GEFD) for financial support.