Evoluční mechanismy a vztahy mezi taxony rodu Pilosella

Urfus, Tomáš

Several case studies at diffrent levels (population, regional, comparative etc.) were carried out to evaluate the importance of different sources of variation and to follow microevolutionary traits in Pilosella (Asteraceae). The gradient of different spatial levels and comparative studies of closely related taxa group (characterised by partly different type of ongoing microevolution - genus Picris) revealed some common processes while at the same time highlighted the uniqueness of genus Pilosella. Microevolutionary potential was studied at the population level using morphometric approach (hybridization tendencies of highly complex hybrid swarm in Prague - Praha Vysočany). Cytogeography of Pilosella officinarum was then investigated at the regional scale (Central Europe). Tetraploid cytotype was detected almost exclusively in Bohemia region and further to the west whereas pentaploid and hexaploid cytotypes prevailed in Moravia and Slovakia and further to south- east. Cytogeography was followed by morphometric evaluation of three most abundant ploidy levels (4x, 5x and 6x) of P. officinarum combined with the analyses of reproduction mode. Results confirmed the possibility to distinguish the particular cytotypes ...

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