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Journal of Heredity Advance Access published online on December 23, 2004
Journal of Heredity, doi:10.1093/jhered/esi011
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© 2005 The American Genetic Association
Received March 24, 2004
Accepted July 20, 2004

Article

Evolution by Reticulation: European Dogroses Originated by Multiple Hybridization Across the Genus Rosa

C. M. Ritz 1*, H. Schmuths 2, and V. Wissemann 1

1 From the Institute of Systematic Botany, University of Jena, Philosophenweg 16, D-07743 Jena, Germany
2 From the the Department of Experimental Taxonomy, IPK Gatersleben, Corrensstr. 3, D-06466 Gatersleben, Germany

* To whom correspondence should be addressed.
C. M. Ritz, E-mail: christiane.ritz{at}uni-jena.de


  Abstract

The European dogroses (Rosa sect. Caninae (DC.) Ser.) are characterized by a unique meiosis system ("canina-meiosis"), which controls the heterogamous development of tetraploid egg cells and haploid pollen grains resulting in a pentaploid somatic status. This permanent anorthoploidy is supposed to have originated by a hybridization event in the postglacial period. In this study we present molecular evidence by an analysis of nuclear ribosomal DNA data that dogroses are complex allopolyploids resulting from multiple hybridization events. As previously described, the nrITS-1 region does not undergo concerted evolution in dogroses. Thus, different ITS-1 sequences persist within single individuals. Secondary structure predictions do not point to the existence of pseudogenes within these ITS-1 types. Our data suggest that the pentaploid Caninae genome originated from different members of nondogroses and the now extinct Protocaninae.


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