Molecular Ecology and Evolution
Majesky, Lubos , Vasut, Radim , Travnicek, Bohumil , Kitner, Miloslav .
Genetic variability in apomictic clones of common dandelion (Taraxacum; Asteraceae).
Clonal reproduction through seeds i.e. apomixis can be significant advantage for plants. Producing high number of seeds of genetically homogeneous plants temporarily increases the success in geographical spread. Apomictic microspecies can spread over larger regions as it is know for e.g. Rubus, Hieracium or Taraxacum. However, the absence of sex leads to mutation accumulation, decreased genetic variability of species etc. Therefore apomictic plants are considered to be blind evolutionary ends. The only source of genetic variation is through gaining the new mutations. These mutations are then inherited by the offspring in consequent lineages only. Genus Taraxacum, which consists of apomictic polyploids and diploid sexuals is represented by 2000+ taxons around the world. These facts make the genus ideal study object to address the question, whether apomictic clones are widely distributed or have just the local spread. We selected 9 morphologically uniform accessions (microspecies) and have done genotyping of 188 individuals of Taraxacum sect. Ruderalia. We used six microsatellite loci together with three AFLP primer combinations. Analyses revealed the presence of genetic differences among and the homogeneity within closely related apomictic microspecies. Low intraspecific genetic variability of apomictic microspecies as well as high interspecific genetic variability suggests that Taraxacum microspecies can be considered as clones. We showed that these clones can spread over large regions of Europe. Detected high genetic similarity between morphologically similar microspecies (T.amplum agg.) may indicate microevolutionary process of splitting the clone into novel lineages by gaining mutations.
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1 - Palacky University Olomouc, Faculty of Science, Department of Botany, Slechtitelu 11, Olomouc, CZ, 783 71 , Czech Republic
Presentation Type: Poster:Posters for Topics
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM