期刊
EVOLUTION
卷 65, 期 12, 页码 3368-3380出版社
WILEY
DOI: 10.1111/j.1558-5646.2011.01410.x
关键词
Background selection; Da; KST; local adaptation; Silene latifolia; Y chromosome
资金
- NERC
- BBSRC
- Leverhulme Trust
- Biotechnology and Biological Sciences Research Council [BB/E020909/1] Funding Source: researchfish
- Natural Environment Research Council [NBAF010002, NE/F018991/1, NE/B504249/2] Funding Source: researchfish
- BBSRC [BB/E020909/1] Funding Source: UKRI
- NERC [NE/F018991/1, NBAF010002] Funding Source: UKRI
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 Da, also known as d) 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.
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