Data from: The battle of the sexes over seed size: support for both kinship genomic imprinting and interlocus contest evolution

utcrossing creates a venue for parental conflict. When one sex provides
parental care to offspring fertilized by several partners, the
nonproviding sex is under selection to maximally exploit the caring sex.
The caring sex may counteradapt, and a coevolutionary arms race ensues.
Genetic models of this conflict include the kinship theory of genomic
imprinting (parent-of-origin-specific expression of maternal-care
effectors) and interlocus conflict evolution (interaction between male
selfish signals and female abatement). Predictions were tested by
measuring the sizes of seeds produced by within-population crosses
(diallel design) and between-population crosses in outcrossing and selfing
populations of Arabidopsis lyrata. Within-population diallel crosses
revealed substantial maternal variance in seed size in most populations.
The comparison of between- and within-population crosses showed that seeds
were larger when pollen came from another outcrossing population than when
pollen came from a selfing or the same population, supporting interlocus
contest evolution between male selfish genes and female recognition genes.
Evidence for kinship genomic imprinting came from complementary trait
means of seed size in reciprocal between-population crosses independent of
whether populations were predominantly selfing or outcrossing. Hence, both
kinship genomic imprinting and interlocus contest are supported in
outcrossing Arabidopsis, whereas only kinship genomic imprinting is
important in selfing populations.