Genetic Architecture of Flowering Time Differs Between Populations With Contrasting Demographic and Selective Histories.

ABSTRACT: Understanding the evolutionary factors that impact the genetic architecture of traits is a central goal of evolutionary genetics. Here, we investigate how quantitative trait variation accumulated over time in populations that colonized a novel environment. We compare the genetic architecture of flowering time in Arabidopsis populations from the drought-prone Cape Verde Islands and their closest outgroup population from North Africa. We find that trait polygenicity is severely reduced in the island populations compared to the continental North African population. Further, trait architectures and reconstructed allelic histories best fit a model of strong directional selection in the islands in accord with a Fisher-Orr adaptive walk. Consistent with this, we find that large-effect variants th

SUBMITTER: Neto C 

PROVIDER: S-EPMC10461413 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature