2019
DOI: 10.1038/s41559-019-0807-4
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Abstract: Ploidy-variable species allow direct inference of the effects of chromosome copy number on fundamental evolutionary processes. While an abundance of theoretical work suggests polyploidy should leave distinct population genomic signatures, empirical data remains sparse. We sequenced ~300 individuals from 39 populations of Arabidopsis arenosa, a naturally diploid-autotetraploid species. We find the impacts of polyploidy on population genomic processes are subtle yet pervasive, including reduced efficiency on lin… Show more

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Cited by 96 publications
(282 citation statements)
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References 91 publications
(122 reference statements)
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“…Overall, genome-wide differentiation between lyrata diploids and the tetraploid populations was extremely low (mean Rho between ploidies = 0.19) with few fixed differences (Table 1; SI Appendix, Table S4 for additional population contrasts), consistent with our previous studies in arenosa 12,13,21 . Table 1.…”
Section: Selective Sweep Signatures At Loci Involved In Adaptation Tosupporting
confidence: 88%
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“…Overall, genome-wide differentiation between lyrata diploids and the tetraploid populations was extremely low (mean Rho between ploidies = 0.19) with few fixed differences (Table 1; SI Appendix, Table S4 for additional population contrasts), consistent with our previous studies in arenosa 12,13,21 . Table 1.…”
Section: Selective Sweep Signatures At Loci Involved In Adaptation Tosupporting
confidence: 88%
“…In contrast, many populations exhibited substantial admixture signals between lyrata and arenosa, contrasting drastically in degree ( Figure 1A). Several tetraploid lyrata populations from the Wachau (SCB, SWA, MAU) displayed only slight admixture with arenosa, and populations at the Wachau margin (PIL, LOI) showed stronger admixture, probably due to the increased proximity to the Hercynian and Alpine arenosa lineages 21 .…”
Section: Resultsmentioning
confidence: 99%
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“…Presently, our results provide a testable hypothesis to explain the observed correlation of polyploidy and crop domestication 10 .More broadly, our results suggest that paleopolyploidy may leave behind a legacy of elevated genetic diversity across the duplicated remnants of diploidized genomes. Although most models and studies of polyploid evolution compare diploids and polyploids11,12,14,16,17,19,[70][71][72] , our comparison of paleologs and non-paleologs within a diploidized paleopolyploid uncovered evidence for similar dynamics ongoing within plant genomes even millions of years after whole genome duplication. The extensive genome duplication history of plants may result in genomes with different levels of diversity based on the mechanisms of gene origin.…”
mentioning
confidence: 88%
“…Polyploidy often precedes domestication and crops are nearly twice as likely to be domesticated in lineages with a relatively recent WGD compared to those without 10 . Among the potential explanations for the relationship between polyploidy and domestication, the expanded genetic diversity and plasticity of polyploid plants may be especially advantageous during domestication and crop improvement [11][12][13][14][15] . Analyses in yeast have shown that polyploid lineages not only have higher genetic diversity but also adapt to new environments faster than their lower ploidal level relatives 16 .…”
Section: Introductionmentioning
confidence: 99%