Impact of demography on linked selection in two outcrossing Brassicaceae species.

ABSTRACT: Genetic diversity is shaped by mutation, genetic drift, gene flow, recombination, and selection. The dynamics and interactions of these forces shape genetic diversity across different parts of the genome, between populations and species. Here, we have studied the effects of linked selection on nucleotide diversity in outcrossing populations of two Brassicaceae species, Arabidopsis lyrata and Capsella grandiflora, with contrasting demographic history. In agreement with previous estimates, we found evidence for a modest population size expansion thousands of generations ago, as well as efficient purifying selection in C. grandiflora. In contrast, the A. lyrata population exhibited evidence for very recent strong population size decline and weaker efficacy of purif

SUBMITTER: Mattila TM 

PROVIDER: S-EPMC6745670 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature