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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Evolutionary history of polyploid complex Galium pumilum in Central Europe
 Knotek, Adam ; Kolář, Filip (advisor) ; Urfus, Tomáš (referee)
The thesis summarizes current knowledge about the polyploid complex of Galium pummilum agg. in Central Europe. This work should provide a theoretical background for a following diploma thesis. Most species of the aggregate are difficult to be determined due to considerable morphological variability and a complex evolutionary history probably involving recurrent polyploidization and hybridization events. Currently, new molecular methods are changing our opinion on the taxonomical classification within the group. Except for G. pumilum MURRAY, the other species show rather disjunctive distribution and are found on relict habitats. This could be caused by postglacial migration and subsequent area fragmentation. Most of the previous studies focused on Galium were published by Friedrich Ehrendorfer, who since the 50th defined division of the complex on the basis of chorological, karyological and morphological data. With new molecular methods, his hypotheses are now exposed to verification. Galium sudeticum TAUSCH. represents an enigmatic and vulnerable taxon of the Czech flora, that raises various interesting questions from both evolutionary and conservation points of view. It has a remarkable disjunct distribution in the Giant mountains (Krkonoše) and in one serpentine area in western Bohemia...
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