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Intersexual conflict over seed size is stronger in more outcrossed populations of a mixed-mating plant

Raunsgard, Astrid; Opedal, Øystein Hjorthol; Ekrem, Runa K; Wright, Jonathan; Bolstad, Geir Hysing; Armbruster, William Scott; Pelabon, Christophe
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2573413
Date
2018
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  • Publikasjoner fra CRIStin - NINA [1723]
  • Scientific publications [744]
Original version
10.1073/pnas.1810979115/-/DCSupplemental
Abstract
Intersexual conflict over maternal resource allocation to offspring

can lead to the evolution of imprinted genes with parentof-

origin–specific expression. However, the precise mechanism

involved in the evolution of such imprinted genes is less well

understood, and few clear predictions have been presented.We

resolve this issue, and, using different populations of a mixedmating

plant, we demonstrate that more outcrossed paternal

populations produce larger seeds when crossed with less outcrossed

maternal populations, and vice versa. This provides clear

support for a “tug-of-war” mechanism operating between maternally

and paternally imprinted genes. Such a mechanism can

have important consequences for local adaptation in offspring

size in the presence of gene flow between populations with

different mating systems.
Journal
Proceedings of the National Academy of Sciences of the United States of America
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