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Genetic variation, disequilibrium and natural selection on reproductive traits in Allium vineale

Författare:
Publiceringsår: 2004
Språk: Engelska
Sidor: 302-311
Publikation/Tidskrift/Serie: Journal of Evolutionary Biology
Volym: 17
Nummer: 2
Dokumenttyp: Artikel
Förlag: Blackwell Publishing

Sammanfattning

Bulbils and seeds collected from Allium vineale plants from natural populations were grown under uniform conditions. The bulbil-derived offspring represented the parental generation, whereas the seed-derived offspring represented the sexually produced offspring generation. Molecular markers were used to identify maternal genets. Variation in traits determining the allocation to sexual and asexual reproduction was partitioned among genets and ramet families in the parental and offspring generations. From observations of a release of genetic variation and slippage in the mean phenotype in the offspring generation, we inferred that there exists extensive genetic disequilibrium for reproductive traits in A. vineale populations, that most of the genetic variance is because of dominance effects, and that natural selection favours a reduced allocation to sexual reproduction. No genetic correlation between sexual and asexual allocation traits was found. We discuss the implications of these results with respect to the evolution of a mixed reproductive system in A. vineale.

Disputation

Nyckelord

  • Biology and Life Sciences
  • clonal plants
  • Allium vineale
  • disequilibrium
  • quantitative genetics
  • natural selection
  • sexual reproduction

Övriga

Published
Yes
  • Evolutionary Genetics
  • ISSN: 1010-061X

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