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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Importance of hybridization in genus Sorbus evolution
 Ondříčková, Klára ; Urfus, Tomáš (advisor) ; Krahulec, František (referee)
From a lot of reason it is really complicated to evaluate biosystematicaly the facultative apomictic groups like a Pilosella, Rubus or Sorbus. How to define the taxons is complicated because of still ongoing microevolutional processes such as inter- specific hybridization, polyploidization and apomixis. Due to these procedures there appear speciations of many genetically different lineages that are separate in the repro- duction. They evince an immense variability on the morphological level. The apomixis itself can be modified a lot and it is combined with other reproductive strategies usually. It was possible to put the hybridization experiments into practice thanks to the huge collection of mainly middle European taxons representatives from genus Sorbus, in Dendrology garden in Průhonice. The trees used for the experimental crossing, were inspected to the microsatellite analysis to specify in more detail their membership of taxons identity. The analysis of new-emerged seeds was performed by flow cytometery (Flow cytometric seed screen - FCSS) enabling very quick detection of reproductive pathways, how the seeds were formed. It has been definitely demonstrated, that the var- iability of the reproductive pathways is very wide, even between each individual cross- ing. There were detected the...
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Hybridization within genus Sorbus in Central Europe
 Ondříčková, Klára ; Urfus, Tomáš (advisor) ; Knotek, Adam (referee)
The genus Sorbus is a very complicated group. Thanks to mikroevolutionary processes such as interspecific hybridization, polyploidy and apomixis produce large quantities of genetically distinct lineages. Hybridization between basic species (S. aria agg., S. torminalis, S. aucuparia, S. chamaemespilus) formed hybridogenous group which speciation is often associated with just polyploidy and apomixis formation, often only optional. Another type of reproduction is observed vegetative layering. The whole group is mophological very variable and taxonomic categorization of certain groups is not solved yet. The work also includes an introduction to the group Sorbus sudetica agg., which representative S. sudetica is endemic to Giant Mountains. At the end there are the current results and the methods that will be used for the master's thesis.
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