Geographical pattern in genome size of Festuca pallens: phylogeographical interpretation of distribution range of polyploid complex
| 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; Poaceae |
| Description | Considerable genome size variability in both ploidy levels and at various spatial scales was detected in Festuca pallens Host using DAPI stained flow-cytometry. Witnin- and among related sites, DNA content was relatively homogenous. However, mean differences up to 5.9 % between nearby localities or up to 11.6 % within the populations were rarely detected. Within the whole distribution area, maximum differences 15.9 % (in diploids) and 14.0 % (in tetraploids) were observed. In both ploidy levels, genome size was correlated with geographical coordinates, with the largest genomes situated in the southeastern parts. Mutual geographic relation between DNA content of diploids and tetraploids was confirmed. Tetraploids have in general lower DNA content than expected by doubling of their diploid progenitors. The main differences in DNA content of tetraploids were attributed with affiliation to 3 different, taxonomically unevaluated types. Affinity of larger genomes to different types of glacial vegetation (steppes rather than periglacial tundra, together with relation to relict habitats in diploids, give reasons for phylogeographic interpretations. |
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