Genome size in Cirsium and its relation to natural hybridization
| Authors | |
|---|---|
| Year of publication | 2005 |
| Type | Article in Proceedings |
| Conference | XVII. International Botanical Congress - Abstracts |
| MU Faculty or unit | |
| Citation | |
| Web | http://www.ibc2005.ac.at |
| Field | Botany |
| Keywords | DNA content; interspecific hybridization; Asteraceae |
| Description | Nuclear DNA amounts of 12 diploid and one tetraploid taxa and 12 natural interspecific hybrids of Cirsium from 102 populations in the Czech Republic, Austria, Slovakia and Hungary were estimated using DAPI and PI flow cytometry. 2C-values of diploid (2n=34) species varied from 2.14 pg in C. heterophyllum to 3.60 pg in C. eriophorum (1.68-fold difference). The hybrids of diploid species remain diploid, and their DNA content was smaller than the mean of the parents'. Species with smaller genomes produce interspecific hybrids more frequently. Biennial species of Cirsium possessed larger nuclear DNA amounts than their perennial relatives. Genome size was negatively correlated with Ellenbergs indicator values for continentality and moisture and with eastern limits of distribution. On the contrary, C-values positively corresponded with the spinyness (degree of spinosity). AT frequency ranged from 48.38 % in C. eriophorum to 51.75 % in C. arvense. |
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