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A polygenic genetic architecture of flowering time in the worldwide Arabidopsis thaliana population.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology. (Örjan Carlborg)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology. (Örjan Carlborg)ORCID iD: 0000-0002-2722-5264
2019 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 36, no 1, p. 141-154Article in journal (Refereed) Published
Abstract [en]

Here, we report an empirical study of the polygenic basis underlying the evolution of complex traits. Flowering time variation measured at 10 and 16 °C in the 1,001-genomes Arabidopsis thaliana collection of natural accessions were used as a model. The polygenic architecture of flowering time was defined as the 48 loci that were significantly associated with flowering time - at 10 and/or 16 °C and/or their difference - in this population. Contributions from alleles at flowering time associated loci to global and local adaptation were explored by evaluating their distribution across genetically and geographically defined subpopulations across the native range of the species. The dynamics in the genetic architecture of flowering time in response to temperature was evaluated by estimating how the effects of these loci on flowering changed with growth temperature. Overall, the genetic basis of flowering time was stable - about 2/3 of the flowering time loci had similar effects at 10 °C and 16 °C - but many loci were involved in gene by temperature interactions. Globally present alleles, mostly of moderate effect, contributed to the differences in flowering times between the subpopulations via subtle changes in allele-frequencies. More extreme local adaptations were, on several occasions, due to regional alleles with relatively large effects, and their LD-patterns suggest co-evolution of functionally connected alleles within local populations. Overall, these findings provide a significant contribution to our understanding about the possible modes of global and local evolution of a complex adaptive trait in Arabidopsis thaliana.

Place, publisher, year, edition, pages
2019. Vol. 36, no 1, p. 141-154
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Genetics
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URN: urn:nbn:se:uu:diva-364954DOI: 10.1093/molbev/msy203ISI: 000459327400012PubMedID: 30388255OAI: oai:DiVA.org:uu-364954DiVA, id: diva2:1261320
Available from: 2018-11-07 Created: 2018-11-07 Last updated: 2019-08-01Bibliographically approved

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Zan, YanjunCarlborg, Örjan

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