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Natural selection can reduce the effective population size of the nonrecombining Y chromosome, whereas local adaptation of Y-linked genes can increase the population divergence and overall intra-species polymorphism of Y-linked sequences. The plant Silene latifolia evolved a Y chromosome relatively recently, and most known X-linked genes have functional Y homologues, making the species interesting for comparisons of X- and Y-linked diversity and subdivision. Y-linked genes show higher population differentiation, compared to X-linked genes, and this might be maintained by local adaptation in Y-linked genes (or low sequence diversity). Here we attempt to test between these causes by investigating DNA polymorphism and population differentiation using a larger set of Y-linked and X-linked S. latifolia genes (than used previously), and show that net sequence divergence for Y-linked sequences (measured by D(a) , also known as δ) is low, and not consistently higher than X-linked genes. This does not support local adaptation, instead, the higher values of differentiation measures for the Y-linked genes probably result largely from reduced total variation on the Y chromosome, which in turn reflect deterministic processes lowering effective population sizes of evolving Y-chromosomes.

Original publication

DOI

10.1111/j.1558-5646.2011.01410.x

Type

Journal article

Journal

Evolution

Publication Date

12/2011

Volume

65

Pages

3368 - 3380

Keywords

Adaptation, Physiological, Chromosomes, Plant, Europe, Genes, Plant, Haplotypes, Polymorphism, Genetic, Population Dynamics, Recombination, Genetic, Sequence Analysis, DNA, Sex Chromosomes, Silene