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Veit Herklotz Senckenberg Museum für Naturkunde, Postfach 300 154, 02806 Görlitz, Germany


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Christiane M. Ritz Senckenberg Museum für Naturkunde, Postfach 300 154, 02806 Görlitz, Germany


 

 

Spontane Hybridisierung von Hundsrosen (Rosa L. sect. Caninae (DC). Ser.) an einem natürlichen Vorkommen in der Oberlausitz (Sachsen, Deutschland)


Abstract

Spontaneous hybrid formation between dogroses (Rosa L. sect. Caninae (DC). Ser.) at a
natural site in Upper Lusatia (Saxony, Germany)
The most diverse group of wild roses in Central Europe is represented by the section Caninae, the dogroses. Species identification within dogroses is challenging because of few clearly differentiating morphological characters and frequent hybrid formation. Sweet Briars, subsection Rubigineae, are xero-thermophilous floral elements of hedges and extensive grasslands of our agricultural landscape, and they are threatened due to the proceeding land use change. Thus, in Saxony, Rosa agrestis is exclusively found at the basalt hill Strohmberg/Upper Lusatia. To characterize this population all members of subsect. Rubigineae were determined and the taxonomic important diameter of the orifice was measured over three growing seasons. Since the diameter of the orifices differed between years the determination lead to different results for some plants. For tracking the hybridogenic origin of the putative hybridogenic species Rosa agrestis we performed genetic analyses (fingerprints using microsatellites; estimation of ploidy levels) and compared its pollen and seed fertility with those of the parental species. Our data demonstrate that some individuals of R. agrestis and R. inodora and the individuals of R. caesia and R. dumalis represent hybrids originating from parental species growing at the stand. However, individuals of R. agrestis and R. inodora without hybridogenic background were found, too. Compared to the parental species we observed a reduced fitness in the hybrids because their pollen fertility and the number of fertile nutlets were significantly lower.

Keywords

hybridisation | microsatellite | polyploidy | Rosa agrestis | Rosaceae


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