Pollen competition in style: Effects of pollen size on siring success in the hermaphroditic common morning glory, Ipomoea purpurea

American Journal of Botany
Britnie McCallum, Shu-Mei Chang

Abstract

Pollen size varies greatly among flowering plant species and has been shown to influence the delivery of sperm cells to the eggs. Relatively little is known, however, about the functional significance of within-species genetic variation in pollen size. This study tests whether pollen size influences the relative siring success of a pollen donor during in vivo pollen competition experiments. We used two groups of Ipomoea purpurea plants genetically divergent in their pollen sizes and applied equal number of pollen grains from one large-pollen and one small-pollen donor onto the same stigma. Using microsatellite genetic markers, we identified the pollen parent of each of the resulting progeny to determine the relative siring success of the competing donors. Competitions between donors of equal-sized pollen served as a control. Differences in pollen size significantly affected the relative siring success of a pollen donor; larger-grained individuals outcompeted smaller-grained competitors but not equal-sized competitors. Relative siring success, however, sometimes varied across different pollen recipients. Pollen size can influence the relative siring success of different individuals competing on the same stigma during postpollina...Continue Reading

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Citations

Nov 20, 2016·Journal of Evolutionary Biology·M E Dorken, L E Perry
Aug 20, 2016·American Journal of Botany·Yuliya B SorinJeffrey D Karron
Mar 17, 2016·American Journal of Botany·Joseph H Williams, Susan J Mazer
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Aug 20, 2020·Proceedings. Biological Sciences·Kai HaoShuang-Quan Huang
Oct 23, 2019·Plant Reproduction·Somayeh Naghiloo, Sedigheh Nikzat Siahkolaee
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Jun 8, 2021·Biological Reviews of the Cambridge Philosophical Society·Kazuharu OhashiJames D Thomson
Jul 25, 2021·Plant Reproduction·Joseph H Williams

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