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Allozyme variation in diploid, polyploid and mixed-ploidy populations of the Pilosella alpicola group (Asteraceae): relation to morphology, origin of polyploids and breeding system

  • Šingliarová, Barbora Slovak Academy of Sciences, Institute of Botany, Bratislava, Slovakia
  • Chrtek, Jindřich Academy of Sciences of the Czech Republic, Institute of Botany, Průhonice, Czech Republic - Department of Botany, Charles University, Praha, Czech Republic
  • Plačková, Ivana Academy of Sciences of the Czech Republic, Institute of Botany, Průhonice, Czech Republic
  • Mráz, Patrik Slovak Academy of Sciences, Institute of Botany, Bratislava, Slovakia - Department of Biology, Unit of Ecology and Evolution, University of Fribourg, Switzerland
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    29.06.2011
Published in:
  • Folia Geobotanica. - 2011, vol. 46, no. 4, p. 387-410
Allopolyploidy
Alps
Apomixis
Autopolyploidy
Balkans
Carpathians
Genetic diversity
Hieracium
Primary contact zone
English The Pilosella alpicola group includes four species (P. alpicola s.str., P. ullepitschii, P. rhodopea and P. serbica) with allopatric distributions (Alps, Balkans, Carpathians) and contrasting cytotype patterns (diploid, diploid-polyploid and polyploid species). Whereas diploid taxa (P. ullepitschii and P. serbica) reproduce sexually, the mode of reproduction of polyploid cytotypes reflects their origin: autopolyploids of P. rhodopea reproduce sexually, while allopolyploid cytotypes of P. alpicola s.str. apomictically. We used allozymes to elucidate overall genetic variation within the group and to test their utility for taxon discrimination, assessment of polyploid origin and possible correlations with breeding systems. Variation of five allozyme systems encoded by eight polymorphic loci and 29 alleles was studied in 20 populations and 298 plants representing all taxa. Allozymes were proved to be only of limited usefulness for the taxonomic classification within the P. alpicola group. The Western Carpathian populations of P. ullepitschii formed the only genetically well-differentiated group. The same allele suite shared by all cytotypes of P. rhodopea and presence of both balanced and unbalanced heterozygotes in tetraploids was consistent with autopolyploid origins of polyploids and provided further evidence for a primary contact zone. An isolated relic population of P. rhodopea from the Southern Carpathians exhibited lowered values of genetic diversity when compared to the core area. Pronounced fixed heterozygosity was found in P. alpicola s.str., supporting its allopolyploid origin. In accordance with assumptions, genotypic variability was significantly higher in sexually reproducing diploid and diploid-polyploid taxa than in apomictic P. alpicola s.str.
Faculty
Faculté des sciences et de médecine
Department
Département de Biologie
Language
  • English
Classification
Botany
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/302161
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