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The influence of herbivory on pre- and postzygotic stages of reproduction following open, self, and outcross pollination

Céline Ghyselen (UGent) , Dries Bonte (UGent) and Rein Brys (UGent)
(2015) AMERICAN JOURNAL OF BOTANY. 102(12). p.2013-2019
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Abstract
PREMISE OF THE STUDY: Herbivory affects pollination success and reproductive output in plants. However, the different stages in the process from pollination to seed maturation have hardly been investigated within the context of herbivory. Herbivory might affect these stages via its effect on geitonogamous pollination and thereby the proportion of self pollen delivered to the stigma and/or via its effect on the nutritional capacity of the maternal plant. METHODS: Plants of monocarpic Cynoglossum officinale were experimentally subjected to root herbivory and exposed to natural open pollination in combination with self and outcross hand pollination. We quantified pollen germination, pollen tube competition intensity, pollen tube attrition, fruit set, and seed initiation, abortion, and maturation. KEY RESULTS: Although root herbivory did not affect pollen germination or pollen tube attrition, fruit set and seed initiation and maturation were negatively affected by herbivory, but for seed initiation only in the case of outcross- and open-pollinated flowers. The intensity of pollen tube competition positively affected seed initiation, but only in plants infested with the herbivore. CONCLUSIONS: Our study demonstrates that herbivory did not affect the early stages following pollination, but significantly impacted later postpollination stages such as fruit set and seed maturation and selection based on pollen tube competition intensity on zygote development. Our findings suggest that decreased nutritional capacity of the mother plant in response to root herbivory rather than herbivory effects on pollen quality was responsible for the lower fruit and seed production in infested plants.
Keywords
Cynoglossum officinale, Boraginaceae, geitonogamy, Mogulones cruciger, pollen germination, pollen tube attrition, pollen tube competition, pollination, root herbivory, seed abortion, self pollination, CYNOGLOSSUM-OFFICINALE L, POLLEN-TUBE GROWTH, SELECTIVE SEED ABORTION, INBREEDING DEPRESSION, LINDERA BENZOIN, WILD RADISH, PLANT, CONSEQUENCES, BORAGINACEAE, LIMITATION

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Citation

Please use this url to cite or link to this publication:

Chicago
Ghyselen, Céline, Dries Bonte, and Rein Brys. 2015. “The Influence of Herbivory on Pre- and Postzygotic Stages of Reproduction Following Open, Self, and Outcross Pollination.” American Journal of Botany 102 (12): 2013–2019.
APA
Ghyselen, C., Bonte, D., & Brys, R. (2015). The influence of herbivory on pre- and postzygotic stages of reproduction following open, self, and outcross pollination. AMERICAN JOURNAL OF BOTANY, 102(12), 2013–2019.
Vancouver
1.
Ghyselen C, Bonte D, Brys R. The influence of herbivory on pre- and postzygotic stages of reproduction following open, self, and outcross pollination. AMERICAN JOURNAL OF BOTANY. 2015;102(12):2013–9.
MLA
Ghyselen, Céline, Dries Bonte, and Rein Brys. “The Influence of Herbivory on Pre- and Postzygotic Stages of Reproduction Following Open, Self, and Outcross Pollination.” AMERICAN JOURNAL OF BOTANY 102.12 (2015): 2013–2019. Print.
@article{7101831,
  abstract     = {PREMISE OF THE STUDY: Herbivory affects pollination success and reproductive output in plants. However, the different stages in the process from pollination to seed maturation have hardly been investigated within the context of herbivory. Herbivory might affect these stages via its effect on geitonogamous pollination and thereby the proportion of self pollen delivered to the stigma and/or via its effect on the nutritional capacity of the maternal plant. 
METHODS: Plants of monocarpic Cynoglossum officinale were experimentally subjected to root herbivory and exposed to natural open pollination in combination with self and outcross hand pollination. We quantified pollen germination, pollen tube competition intensity, pollen tube attrition, fruit set, and seed initiation, abortion, and maturation. 
KEY RESULTS: Although root herbivory did not affect pollen germination or pollen tube attrition, fruit set and seed initiation and maturation were negatively affected by herbivory, but for seed initiation only in the case of outcross- and open-pollinated flowers. The intensity of pollen tube competition positively affected seed initiation, but only in plants infested with the herbivore. 
CONCLUSIONS: Our study demonstrates that herbivory did not affect the early stages following pollination, but significantly impacted later postpollination stages such as fruit set and seed maturation and selection based on pollen tube competition intensity on zygote development. Our findings suggest that decreased nutritional capacity of the mother plant in response to root herbivory rather than herbivory effects on pollen quality was responsible for the lower fruit and seed production in infested plants.},
  author       = {Ghyselen, C{\'e}line and Bonte, Dries and Brys, Rein},
  issn         = {0002-9122},
  journal      = {AMERICAN JOURNAL OF BOTANY},
  keyword      = {Cynoglossum officinale,Boraginaceae,geitonogamy,Mogulones cruciger,pollen germination,pollen tube attrition,pollen tube competition,pollination,root herbivory,seed abortion,self pollination,CYNOGLOSSUM-OFFICINALE L,POLLEN-TUBE GROWTH,SELECTIVE SEED ABORTION,INBREEDING DEPRESSION,LINDERA BENZOIN,WILD RADISH,PLANT,CONSEQUENCES,BORAGINACEAE,LIMITATION},
  language     = {eng},
  number       = {12},
  pages        = {2013--2019},
  title        = {The influence of herbivory on pre- and postzygotic stages of reproduction following open, self, and outcross pollination},
  url          = {http://dx.doi.org/10.3732/ajb.1500291},
  volume       = {102},
  year         = {2015},
}

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