ISSN:
1432-2242
Keywords:
Key words Hypericum
;
FISH
;
5S/25S rRNA genes
;
Karyotype evolution
;
Polyploidy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s001220051447
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