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Comparative analyses of population structure in two subspecies of Nigella degenii: Evidence for diversifying selection on pollen-color dimorphisms

Jörgensen, Tove LU ; Richardson, D S and Andersson, Stefan LU (2006) In Evolution 60(3). p.518-528
Abstract
Flower color can be a major determinant of plant fitness, not only because of preferential visitation by pollinators but also because of pleiotropic relationships between the expression of floral pigments and biochemically related compounds that influence vegetative performance variables. Different environments may therefore favor different pigmentation phenotypes. We examined whether spatially varying selection has played a major role in shaping large-scale patterns of differentiation in two subspecies of Nigella degenii (Ranunculaceae), with particular emphasis on pollen color. The two subspecies appear to have been genetically isolated for substantial periods of time and, therefore, provide a "replicated test" for the effect of natural... (More)
Flower color can be a major determinant of plant fitness, not only because of preferential visitation by pollinators but also because of pleiotropic relationships between the expression of floral pigments and biochemically related compounds that influence vegetative performance variables. Different environments may therefore favor different pigmentation phenotypes. We examined whether spatially varying selection has played a major role in shaping large-scale patterns of differentiation in two subspecies of Nigella degenii (Ranunculaceae), with particular emphasis on pollen color. The two subspecies appear to have been genetically isolated for substantial periods of time and, therefore, provide a "replicated test" for the effect of natural selection. Estimates of population structure based on a suite of floral and vegetative characters were compared with the corresponding data for amplified fragment length polymorphism (AFLP) markers, which were assumed to be selectively neutral. We found low levels of genetic structure within the subspecies using both the AFLP markers (F-ST <= 0.05) and quantitative characters (Q(ST) <= 0.15), with no statistically significant differences between the two measures. There is, therefore, no evidence of diversifying selection being important in structuring variation in quantitative characters within each of the two subspecies. In contrast, estimates of differentiation in pollen color (F-ST <= 0.10) significantly exceeded the neutral expectations (estimated from AFLP data), Suggesting that local adaptation has played a key role in the evolution of this monogenic character. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Evolution
volume
60
issue
3
pages
518 - 528
publisher
Wiley-Blackwell
external identifiers
  • wos:000236698100010
  • pmid:16637497
  • scopus:33646928422
ISSN
1558-5646
language
English
LU publication?
yes
id
44e8cdb8-fd1c-4fab-b4a6-4bd1141e19ce (old id 159486)
alternative location
http://www.bioone.org/archive/0014-3820/60/3/pdf/i0014-3820-60-3-518.pdf
date added to LUP
2007-07-02 11:50:38
date last changed
2019-05-28 02:23:50
@article{44e8cdb8-fd1c-4fab-b4a6-4bd1141e19ce,
  abstract     = {Flower color can be a major determinant of plant fitness, not only because of preferential visitation by pollinators but also because of pleiotropic relationships between the expression of floral pigments and biochemically related compounds that influence vegetative performance variables. Different environments may therefore favor different pigmentation phenotypes. We examined whether spatially varying selection has played a major role in shaping large-scale patterns of differentiation in two subspecies of Nigella degenii (Ranunculaceae), with particular emphasis on pollen color. The two subspecies appear to have been genetically isolated for substantial periods of time and, therefore, provide a "replicated test" for the effect of natural selection. Estimates of population structure based on a suite of floral and vegetative characters were compared with the corresponding data for amplified fragment length polymorphism (AFLP) markers, which were assumed to be selectively neutral. We found low levels of genetic structure within the subspecies using both the AFLP markers (F-ST &lt;= 0.05) and quantitative characters (Q(ST) &lt;= 0.15), with no statistically significant differences between the two measures. There is, therefore, no evidence of diversifying selection being important in structuring variation in quantitative characters within each of the two subspecies. In contrast, estimates of differentiation in pollen color (F-ST &lt;= 0.10) significantly exceeded the neutral expectations (estimated from AFLP data), Suggesting that local adaptation has played a key role in the evolution of this monogenic character.},
  author       = {Jörgensen, Tove and Richardson, D S and Andersson, Stefan},
  issn         = {1558-5646},
  language     = {eng},
  number       = {3},
  pages        = {518--528},
  publisher    = {Wiley-Blackwell},
  series       = {Evolution},
  title        = {Comparative analyses of population structure in two subspecies of Nigella degenii: Evidence for diversifying selection on pollen-color dimorphisms},
  volume       = {60},
  year         = {2006},
}