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Folia Geobotanica

, Volume 29, Issue 2, pp 265–275 | Cite as

Clonality as a part of the evolution process inTaraxacum

  • Jan Kirschner
  • Jan Štěpánek
Article

Abstract

A review is presented of various ecological and population aspects ofTaraxacum agamospermy. Agamospermy is compared with vegetative clonality, the former differeing in capability to generate variation, seed dispersal and often long evolutionary history. Clonal diversity of agamospermous taxa ranges from almost absolute uniclonality to high diversity of clones. Multiclonality is suggested to represent one of agamospecies' population characteristics. Biological individuality of clones allows coexistence of clones at a locality. Competition and other factors influencing number of clones at a locality are discussed. Geographical and ecological distribution of agamospermous and sexualTaraxacum taxa are evaluated, their coexistence and gene flow are addressed, and a hypothesis is presented concerning the population condition in mixed stands of sexual and asexualTaraxaca. Lastly, agamospermy is shown to significantly reduce recombination processes; it should not be considered an absolute evolutionary “blind alley”.

Keywords

Agamospermy Clonal diversity Clone coexistence Microevolution 

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References

  1. Battjes J., Menken S.B.J. &Den Nus J.C.M. (1992): Clonal diversity in some microspecies ofTaraxacum sect.Palustria (Lindb. fil.)Dahlst. from Czechoslovakia._— Bot. Jb. Syst. 114: 315–328.Google Scholar
  2. Brunton D.F. (1989): The Marsh Dandelion (Taraxacum sect.Palustria; Asteraceae) in Canada and the adjacent United States_— Rhodora 91: 213–219.Google Scholar
  3. den Nus J.C.M. &van der Hulst A. (1988): Cytogeography ofTaraxacum sect.Erythrosperma: diploid sexuals in SE and SW Europe._— Bot. J. Syst. 110: 83–93.Google Scholar
  4. den Nus J.C.M., Kirschner J., Štěpánek J. &van der Hulst A. (1990): Distribution of diploid sexual plants ofTaraxacum sect.Ruderalia in east-Central Europe, with special reference to Czechoslovakia. — Pl. Syst. Evol. 170: 71–84.CrossRefGoogle Scholar
  5. Den Nus J.C.M., Menken S.B.J. & Vlot L. (1987): Gene flow in a di-triploid mixed stand ofTaraxacum (Asteraceae) in the Odenwald, BRD, as measured by isozyme analysis.— In: Abstr. 14th Int. Bot. Congress, Berlin, p. 307.Google Scholar
  6. Doll R. (1974): Die GattungTaraxacum._— A. Ziemsen, Wittenberg-Lutherstadt.Google Scholar
  7. Elzinga D., van der Kamp J., den Nijs J.C.M. &Sterk A.A (1987): Cytogeography and ecology of diploids and triploids ofTaraxacum sectionTaraxacum in South Limburg, Netherlands._— Proc. Koninkl. Nederl. Akad. Wet., ser. C, 90: 431–442.Google Scholar
  8. Ford H. (1985): Life history strategies in two coexisting agamospecies of dandelion._— Biol. J. Linn. Soc. 25: 169–186.Google Scholar
  9. Fürnkranz D. (1965): Beiträge zur Cytogenetik experimenteller und natürlicher Hybriden beiTaraxacum.— Ber. Deutsch. Bot. Ges. 78: 139–142.Google Scholar
  10. Janzen D.H. (1977): What are dandelions and aphids._— Am. Nat. 111: 586–590.CrossRefGoogle Scholar
  11. Jenniskens M.-J.P.J., den Nus J.C.M. &Huizing B.A. (1984): Karyogeography ofTaraxacum sect.Taraxacum and the possible occurrence of facultative agamospermy in Bavaria and north-western Austria. — Phyton 24: 11–34.Google Scholar
  12. King L.M. &Schaal B.A. (1990): Genotypic variation within asexual lineages ofTaraxacum officinale_— Proc. Natl. Acad. Sci. USA 87: 998–1002.PubMedCrossRefGoogle Scholar
  13. Kirschner J. &Štěpánek J. (1987): Again on the sections inTaraxacum (Cichoriaceae). Studies inTaraxacum 6_— Taxon 36: 608–617.CrossRefGoogle Scholar
  14. Loenhoud P.J. &Duyts H. (1981): A comparative study of the germination ecology., of some microspecies ofTaraxacum Wigg._— Acta Bot. Neerl. 30: 161–182.Google Scholar
  15. Małecka J (1973): Problems in the mode of reproduction in microspecies ofTaraxacum sectionPalustria Dahlstedt_— Acta Biol. Cracov., ser. bot. 16: 37–84.Google Scholar
  16. Menken S.B.J. &Morita T. (1989): Uniclonal population structure in the pentaploid obligate agamospermTaraxacum albidum,Dahlst_— Plant Species Biol. 4: 29–36.CrossRefGoogle Scholar
  17. Mogie M. &Ford H. (1988): Sexual and asexualTaraxacum species._— Biol. J. Linn. Soc. 35: 155–168.Google Scholar
  18. Mogie M. &Richards A.J. (1983): Satellited chromosomes, systematics and phylogeny inTaraxacum (Asteraceae)._— Pl. Syst. Evol. 141: 219–229.CrossRefGoogle Scholar
  19. Morita T., Sterk A. &den Nus J.C.M. (1990): The significance of agamospermous triploid pollen donors in the sexual relationship between diploids and triploids inTaraxacum (Compositae)_— Plant Species Biol. 5: 167–176.CrossRefGoogle Scholar
  20. Ogawa K., &Mototani I. (1991): Land-use selection by dandelions in the Tokyo Metropolitan Area, Japan. — Ecol. Res. 6: 233–246.CrossRefGoogle Scholar
  21. Øllgaard H. (1978): New species ofTaraxacum from Denmark._— Bot. Not. 131: 497–521.Google Scholar
  22. Oosterveld P. (1983):Taraxacum species as ecological indicators for grassland management_— Envir. Monit. Assessment 3: 381–389.CrossRefGoogle Scholar
  23. Richards A.J. (1970): Eutriploid facultative agamospermy inTaraxacum_— New Phytol. 69: 761–774.CrossRefGoogle Scholar
  24. Richards A.J. (1986): Plant breeding systems._— Allen & Unwin, London.Google Scholar
  25. Solbrig O.T. &Simpson B.B. (1974): Components of regulation of a population of dandelions in Michigan. — J. Ecol. 62: 473–486.CrossRefGoogle Scholar
  26. Solbrig O.T. &Simpson B.B. (1977): A garden experiment on competition between biotypes of the common dandelion (Taraxacum officinale.)._— J. Ecol. 65: 427–430.CrossRefGoogle Scholar
  27. Sörensen T. (1958): Sexual chromosome aberrants in triploid apomicticTaraxaca_— Bot. Tidskr. 54: 1–22.Google Scholar
  28. Sterk A. A. (1987a): Paardebloemen. Planten zonder vader._— KNNV, Utrecht.Google Scholar
  29. Sterk A. A. (1987b): Aspects of the population biology of sexual dandelions in the Netherlands._— In:Huiskes A.H.L. Blom C.W.P.M. & Rozema J. [eds.]. Vegetation between land and sea, pp. 284–290. Dordrecht.Google Scholar
  30. van Oostrum H., Sterk A.A. &Wijsman H.J.W. (1985): Genetic variation in agamospermous microspecies ofTaraxacum sect.Erythrosperma and sect.Obliqua_— Heredity 55: 223–228.Google Scholar
  31. von Hofsten C.G (1954): Studier över släktetTaraxacum Wigg. med. särskild, hänsyntill gruppenVulgaria Dt. i Skandinavien._— LTs Jörlag, Stockholm.Google Scholar

Copyright information

© Institute of Botany 1994

Authors and Affiliations

  • Jan Kirschner
    • 1
  • Jan Štěpánek
    • 1
  1. 1.Institute of BotanyAcademy of Sciences of the Czech RepublicPrůhoniceCzech Republic

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