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Effect of root contact on pollen competitive ability in a hermaphroditic winter-annual herb

Lankinen, Åsa LU ; Niss, Jerker and Madjidian, Josefin A. LU (2016) In Evolutionary Ecology 30(4). p.739-754
Abstract

Presence of a root neighbor can induce changes in root allocation and pollen traits, but only a limited number of studies have investigated such effects on pollen. To learn more about effects of root contact on pollen competitive ability, we studied plants of the hermaphroditic winter-annual Collinsia heterophylla, native to California. We cultivated plants in two-pot treatments with roots kept either separate or intermingled with the same amount of resources. Pollen-tube growth rate, as an indication of pollen competitive ability, was affected by root treatment but the response varied among competing plant families. The response to root-treatment was not an effect of differential resource uptake of the two competitors. Root biomass was... (More)

Presence of a root neighbor can induce changes in root allocation and pollen traits, but only a limited number of studies have investigated such effects on pollen. To learn more about effects of root contact on pollen competitive ability, we studied plants of the hermaphroditic winter-annual Collinsia heterophylla, native to California. We cultivated plants in two-pot treatments with roots kept either separate or intermingled with the same amount of resources. Pollen-tube growth rate, as an indication of pollen competitive ability, was affected by root treatment but the response varied among competing plant families. The response to root-treatment was not an effect of differential resource uptake of the two competitors. Root biomass was significantly higher when roots were intermingled compared to separate. This finding adds to the number of species with a strategic root response in the presence of competitors, but could also be a consequence of a larger rooting volume. Allocation to pollen performance versus roots in the presence of a competitor was lower in small plants and higher in large plants, potentially implying high costs of producing competitive pollen. We conclude that our study demonstrated that pollen tube growth rate is highly sensitive to the root environment in C. heterophylla.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Allocation, Collinsia heterophylla, Plant size, Pollen-tube growth rate, Roots, Tradedy of the commons
in
Evolutionary Ecology
volume
30
issue
4
pages
16 pages
publisher
Springer
external identifiers
  • scopus:84978968810
  • wos:000379520200010
ISSN
0269-7653
DOI
10.1007/s10682-016-9839-2
language
English
LU publication?
yes
id
e4160db9-cf26-4fc2-8f07-59bb3033cf3c
date added to LUP
2016-12-13 11:38:01
date last changed
2017-05-14 04:46:11
@article{e4160db9-cf26-4fc2-8f07-59bb3033cf3c,
  abstract     = {<p>Presence of a root neighbor can induce changes in root allocation and pollen traits, but only a limited number of studies have investigated such effects on pollen. To learn more about effects of root contact on pollen competitive ability, we studied plants of the hermaphroditic winter-annual Collinsia heterophylla, native to California. We cultivated plants in two-pot treatments with roots kept either separate or intermingled with the same amount of resources. Pollen-tube growth rate, as an indication of pollen competitive ability, was affected by root treatment but the response varied among competing plant families. The response to root-treatment was not an effect of differential resource uptake of the two competitors. Root biomass was significantly higher when roots were intermingled compared to separate. This finding adds to the number of species with a strategic root response in the presence of competitors, but could also be a consequence of a larger rooting volume. Allocation to pollen performance versus roots in the presence of a competitor was lower in small plants and higher in large plants, potentially implying high costs of producing competitive pollen. We conclude that our study demonstrated that pollen tube growth rate is highly sensitive to the root environment in C. heterophylla.</p>},
  author       = {Lankinen, Åsa and Niss, Jerker and Madjidian, Josefin A.},
  issn         = {0269-7653},
  keyword      = {Allocation,Collinsia heterophylla,Plant size,Pollen-tube growth rate,Roots,Tradedy of the commons},
  language     = {eng},
  month        = {08},
  number       = {4},
  pages        = {739--754},
  publisher    = {Springer},
  series       = {Evolutionary Ecology},
  title        = {Effect of root contact on pollen competitive ability in a hermaphroditic winter-annual herb},
  url          = {http://dx.doi.org/10.1007/s10682-016-9839-2},
  volume       = {30},
  year         = {2016},
}