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Pollen competition reduces inbreeding depression in Collinsia heterophylla (Plantaginaceae)

Lankinen, Åsa LU and Armbruster, W S (2007) In Journal of Evolutionary Biology 20(2). p.737-749
Abstract
We tested two predictions of the hypothesis that competition between self-pollen may mitigate negative genetic effects of inbreeding in plants: (1) intense competition among self-pollen increases offspring fitness; and (2) pollen competition reduces the measured strength of inbreeding depression. We used Collinsia heterophylla (Plantaginaceae), an annual with a mixed mating system, to perform controlled crosses in which we varied both the size of the pollen load and the source of pollen (self vs. outcross). Fitness of selfed offspring was higher in the high pollen-load treatment. Our second prediction was also upheld: inbreeding depression was, on average, lower when large pollen loads were applied (11%) relative to the low pollen-load... (More)
We tested two predictions of the hypothesis that competition between self-pollen may mitigate negative genetic effects of inbreeding in plants: (1) intense competition among self-pollen increases offspring fitness; and (2) pollen competition reduces the measured strength of inbreeding depression. We used Collinsia heterophylla (Plantaginaceae), an annual with a mixed mating system, to perform controlled crosses in which we varied both the size of the pollen load and the source of pollen (self vs. outcross). Fitness of selfed offspring was higher in the high pollen-load treatment. Our second prediction was also upheld: inbreeding depression was, on average, lower when large pollen loads were applied (11%) relative to the low pollen-load treatment (28%). The reduction was significant for two fitness components relatively late in the life-cycle: number of surviving seedlings and pollen-tube growth rate in vitro. These findings suggest that intermittent inbreeding, which leads to self-fertilization in plants with genetic loads, may select for traits that enhance pollen competition. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
self-pollination, pollen-load size, mixed-mating system, prezygotic selection, mating-system evolution
in
Journal of Evolutionary Biology
volume
20
issue
2
pages
737 - 749
publisher
John Wiley & Sons
external identifiers
  • wos:000244244300032
  • scopus:33847029664
ISSN
1420-9101
DOI
10.1111/j.1420-9101.2006.01233.x
language
English
LU publication?
yes
id
e7d58940-c29d-4e9a-8ad5-78f931dc4ca1 (old id 167037)
date added to LUP
2007-07-02 12:11:39
date last changed
2017-11-12 03:21:57
@article{e7d58940-c29d-4e9a-8ad5-78f931dc4ca1,
  abstract     = {We tested two predictions of the hypothesis that competition between self-pollen may mitigate negative genetic effects of inbreeding in plants: (1) intense competition among self-pollen increases offspring fitness; and (2) pollen competition reduces the measured strength of inbreeding depression. We used Collinsia heterophylla (Plantaginaceae), an annual with a mixed mating system, to perform controlled crosses in which we varied both the size of the pollen load and the source of pollen (self vs. outcross). Fitness of selfed offspring was higher in the high pollen-load treatment. Our second prediction was also upheld: inbreeding depression was, on average, lower when large pollen loads were applied (11%) relative to the low pollen-load treatment (28%). The reduction was significant for two fitness components relatively late in the life-cycle: number of surviving seedlings and pollen-tube growth rate in vitro. These findings suggest that intermittent inbreeding, which leads to self-fertilization in plants with genetic loads, may select for traits that enhance pollen competition.},
  author       = {Lankinen, Åsa and Armbruster, W S},
  issn         = {1420-9101},
  keyword      = {self-pollination,pollen-load size,mixed-mating system,prezygotic selection,mating-system evolution},
  language     = {eng},
  number       = {2},
  pages        = {737--749},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Evolutionary Biology},
  title        = {Pollen competition reduces inbreeding depression in Collinsia heterophylla (Plantaginaceae)},
  url          = {http://dx.doi.org/10.1111/j.1420-9101.2006.01233.x},
  volume       = {20},
  year         = {2007},
}