Data from: The effects of haploid selection on Y chromosome evolution in two closely related dioecious plants
The evolution of sex chromosomes is usually considered to be driven by sexually antagonistic selection in the diploid phase. However, selection during the haploid gametic phase of the lifecycle has recently received theoretical attention as possibly playing a central role in sex chromosome evolution...
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Zusammenfassung: | The evolution of sex chromosomes is usually considered to be driven by
sexually antagonistic selection in the diploid phase. However, selection
during the haploid gametic phase of the lifecycle has recently received
theoretical attention as possibly playing a central role in sex chromosome
evolution, especially in plants where gene expression in the haploid phase
is extensive. In particular, male-specific haploid selection might favour
the linkage of pollen beneficial alleles to male sex determining regions
on incipient Y chromosomes. This linkage might then allow such alleles to
further specialise for the haploid phase. Purifying haploid selection is
also expected to slow the degeneration of Y-linked genes expressed in the
haploid phase. Here, we examine the evolution of gene expression in flower
buds and pollen of two species of Rumex to test for signatures of haploid
selection acting during plant sex chromosome evolution. We find that genes
with high ancestral pollen expression bias occur more often on sex
chromosomes than autosomes and that genes on the Y chromosome are more
likely to become enriched for pollen expression bias. We also find that
genes with low expression in pollen are more likely to be lost from the Y
chromosome. Our results suggest that sex-specific haploid selection during
the gametophytic stage of the lifecycle may be a major contributor to
several features of plant sex chromosome evolution. |
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DOI: | 10.5061/dryad.69k0b3r |