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Influence of number of pollinations and pollen load size on maternal fitness costs in Collinsia heterophylla: implications for existence of a sexual conflict over timing of stigma receptivity.

Madjidian, Josefin LU ; Hydbom, Sofia LU and Lankinen, Åsa LU (2012) In Journal of Evolutionary Biology 25(8). p.1623-1635
Abstract
Costs related to pollen competition have rarely been considered, but are expected in the case of sexual conflict where male and female sexual functions have opposing evolutionary interests. In Collinsia heterophylla, delayed stigma receptivity is beneficial as it enhances pollen competition. A sexual conflict over timing of stigma receptivity has been proposed in this species as early pollination, following one-time pollinations, is advantageous to pollen donors at a cost of reduced maternal seed set (measured as seed number). In this study, we explored whether the maternal cost was still present following an additional pollination. We hypothesized that the cost is caused either by harm related to early pollen presence or by factors... (More)
Costs related to pollen competition have rarely been considered, but are expected in the case of sexual conflict where male and female sexual functions have opposing evolutionary interests. In Collinsia heterophylla, delayed stigma receptivity is beneficial as it enhances pollen competition. A sexual conflict over timing of stigma receptivity has been proposed in this species as early pollination, following one-time pollinations, is advantageous to pollen donors at a cost of reduced maternal seed set (measured as seed number). In this study, we explored whether the maternal cost was still present following an additional pollination. We hypothesized that the cost is caused either by harm related to early pollen presence or by factors unrelated to harm. We performed pollinations at different stages of floral development, either one or two pollinations (24-h time lag), and varied the size of the first pollen load in the latter category. Early pollination reduced seed biomass also after two-time pollinations, suggesting a persistent maternal cost of early pollen presence. Further, pollen load size modified seed production, possibly indicating that dose-dependent harm influences the maternal cost of early fertilization. Our results strongly suggest negative effects of pollen competition on maternal fitness following early pollination, which is consistent with the existence of a sexual conflict over timing of stigma receptivity. In conclusion, we propose that much could be gained if more plant studies considered the potential for fitness costs in relation to sexual conflict, particularly those investigating pollen-pistil interactions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Collinsia heterophylla, pollen–pistil interactions, pollen competition, harm, conflict cost, sexual conflict, stigma receptivity
in
Journal of Evolutionary Biology
volume
25
issue
8
pages
1623 - 1635
publisher
John Wiley & Sons
external identifiers
  • wos:000306402800016
  • pmid:22747851
  • scopus:84864008088
ISSN
1420-9101
DOI
10.1111/j.1420-9101.2012.02545.x
language
English
LU publication?
yes
id
772040db-0dc4-445c-9ad4-75f34b24add1 (old id 2967675)
date added to LUP
2012-09-05 13:48:02
date last changed
2017-10-22 03:06:52
@article{772040db-0dc4-445c-9ad4-75f34b24add1,
  abstract     = {Costs related to pollen competition have rarely been considered, but are expected in the case of sexual conflict where male and female sexual functions have opposing evolutionary interests. In Collinsia heterophylla, delayed stigma receptivity is beneficial as it enhances pollen competition. A sexual conflict over timing of stigma receptivity has been proposed in this species as early pollination, following one-time pollinations, is advantageous to pollen donors at a cost of reduced maternal seed set (measured as seed number). In this study, we explored whether the maternal cost was still present following an additional pollination. We hypothesized that the cost is caused either by harm related to early pollen presence or by factors unrelated to harm. We performed pollinations at different stages of floral development, either one or two pollinations (24-h time lag), and varied the size of the first pollen load in the latter category. Early pollination reduced seed biomass also after two-time pollinations, suggesting a persistent maternal cost of early pollen presence. Further, pollen load size modified seed production, possibly indicating that dose-dependent harm influences the maternal cost of early fertilization. Our results strongly suggest negative effects of pollen competition on maternal fitness following early pollination, which is consistent with the existence of a sexual conflict over timing of stigma receptivity. In conclusion, we propose that much could be gained if more plant studies considered the potential for fitness costs in relation to sexual conflict, particularly those investigating pollen-pistil interactions.},
  author       = {Madjidian, Josefin and Hydbom, Sofia and Lankinen, Åsa},
  issn         = {1420-9101},
  keyword      = {Collinsia heterophylla,pollen–pistil interactions,pollen competition,harm,conflict cost,sexual conflict,stigma receptivity},
  language     = {eng},
  number       = {8},
  pages        = {1623--1635},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Evolutionary Biology},
  title        = {Influence of number of pollinations and pollen load size on maternal fitness costs in Collinsia heterophylla: implications for existence of a sexual conflict over timing of stigma receptivity.},
  url          = {http://dx.doi.org/10.1111/j.1420-9101.2012.02545.x},
  volume       = {25},
  year         = {2012},
}