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Experimental crosses within European Silene latifolia (Caryophyllaceae): intraspecific differentiation, distance effects, and sex ratio

Author:
  • Louise Hathaway
  • Stefan Andersson
  • Honor C Prentice
Publishing year: 2009
Language: English
Pages: 231-240
Publication/Series: Canadian Journal of Botany
Volume: 87
Issue: 3
Document type: Journal article
Publisher: Canadian Science Publishing, NRC Research Press

Abstract english

The dioecious weed Silene latifolia Poiret is thought to have spread northwards through Europe from separate southern source populations and shows a pronounced east–west pattern of differentiation in seed morphology. We used crossing experiments to investigate whether patterns of interfertility in S. latifolia are consistent with a scenario of ongoing speciation (reflected by outbreeding depression in crosses between the seed races), a scenario involving local inbreeding (reflected by heterosis in interpopulations crosses), or a combination of both scenarios. The experiments involved three western and three eastern populations, which were crossed reciprocally in all possible inter- and intra-population combinations. Inter-race cross-progenies did not have lower fitness than those from intra-racial crosses, and the results are not consistent with a scenario of incipient speciation. A pattern of overall heterosis was found in three variables, indicating the expression of inbreeding depression in progeny from intrapopulation crosses. For two fitness variables, negative relationships between interpopulation distance and heterosis, together with signs of outbreeding depression in the longest-distance crosses, suggest that there may be significant levels of genetic differentiation between geographically distant populations. The sex ratio was female-biased in most progenies, especially in those from the longest-distance crosses.

Keywords

  • Ecology
  • experimental hybridization
  • heterosis
  • inbreeding depression
  • incipient speciation
  • outbreeding depression
  • sex ratio

Other

Published
  • ISSN: 0008-4026
Stefan Andersson
E-mail: stefan [dot] andersson [at] biol [dot] lu [dot] se

Professor

Biodiversity

+46 46 222 44 08

E-A322

50

Research group

Plant Biology

Projects

 

Doctoral students and Postdocs

PhD students, main supervisor

Gróa Valgerdur Ingimudardóttir

Downloads & links

CV (pdf; 19 kb)

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