caa a22 4500 475794729 CHVBK 20180406123720.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1007/s001220051447 doi (NATIONALLICENCE)springer-10.1007/s001220051447 Cytogenetic characterization of three Hypericum species by in situ hybridization [Elektronische Daten] [R. Brutovská, E. Čellárová, I. Schubert] Abstract : The chromosomal positions of the 5S/25S rRNA genes of Hypericum perforatum (2n=32), H. maculatum (2n=16) and H. attenuatum (2n=32) were comparatively determined by FISH, and six, three and seven chromosome pairs of the respective karyotypes were subsequently distinguished. The rDNA loci between H. perforatum and H. maculatum seem to be identical (with respect to the ploidy difference), indicating that H. perforatum probably arose by autotetraploidization from an ancestor closely related to H. maculatum. The positional differences between the 5S rRNA gene loci of H. perforatum and H. maculatum on the one hand and H. attenuatum on the other argue against a previous hypothesis according to which H. perforatum originated from a remote interspecific hybridization between H. maculatum and H. attenuatum. Springer-Verlag Berlin Heidelberg, 2000 Key words Hypericum nationallicence FISH nationallicence 5S/25S rRNA genes nationallicence Karyotype evolution nationallicence Polyploidy nationallicence Brutovská R. Department of Experimental Botany and Genetics, Faculty of Science, P.J. áafárik University, Mánesova 23, SK-04167 Koäice, Slovakia, XX aut Čellárová E. Department of Experimental Botany and Genetics, Faculty of Science, P.J. áafárik University, Mánesova 23, SK-04167 Koäice, Slovakia, XX aut Schubert I. Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Corrensstrasse 3, D-06446 Gatersleben, Germany e-mail: Schubert@ipk-gatersleben.de Fax: (+49) 39482-5137, DE aut https://doi.org/10.1007/s001220051447 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s001220051447 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Brutovská R. Department of Experimental Botany and Genetics, Faculty of Science, P.J. áafárik University, Mánesova 23, SK-04167 Koäice, Slovakia, XX aut NATIONALLICENCE 700 1- Čellárová E. Department of Experimental Botany and Genetics, Faculty of Science, P.J. áafárik University, Mánesova 23, SK-04167 Koäice, Slovakia, XX aut NATIONALLICENCE 700 1- Schubert I. Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Corrensstrasse 3, D-06446 Gatersleben, Germany e-mail: Schubert@ipk-gatersleben.de Fax: (+49) 39482-5137, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer