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

Hathaway, Louise LU ; Andersson, Stefan LU and Prentice, Honor C LU (2009) In Canadian Journal of Botany 87(3). p.231-240
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
experimental hybridization, heterosis, inbreeding depression, incipient speciation, outbreeding depression, sex ratio
in
Canadian Journal of Botany
volume
87
issue
3
pages
231 - 240
publisher
Canadian Science Publishing, NRC Research Press
external identifiers
  • wos:000265544300002
  • scopus:65349088493
ISSN
0008-4026
DOI
10.1139/B08-137
language
English
LU publication?
yes
id
8dba51fe-d7f3-46e4-b97a-f08fe848a678 (old id 1397727)
date added to LUP
2009-05-20 12:59:51
date last changed
2017-11-29 10:53:21
@article{8dba51fe-d7f3-46e4-b97a-f08fe848a678,
  abstract     = {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.},
  author       = {Hathaway, Louise and Andersson, Stefan and Prentice, Honor C},
  issn         = {0008-4026},
  keyword      = {experimental hybridization,heterosis,inbreeding depression,incipient speciation,outbreeding depression,sex ratio},
  language     = {eng},
  number       = {3},
  pages        = {231--240},
  publisher    = {Canadian Science Publishing, NRC Research Press},
  series       = {Canadian Journal of Botany},
  title        = {Experimental crosses within European Silene latifolia (Caryophyllaceae): intraspecific differentiation, distance effects, and sex ratio},
  url          = {http://dx.doi.org/10.1139/B08-137},
  volume       = {87},
  year         = {2009},
}