The influence of population structure on gene expression and flowering time variation in the ubiquitous weed Capsella bursa-pastoris (Brassicaceae)

Molecular Ecology
D KryvokhyzhaMartin Lascoux

Abstract

Population structure is a potential problem when testing for adaptive phenotypic differences among populations. The observed phenotypic differences among populations can simply be due to genetic drift, and if the genetic distance between them is not considered, the differentiation may be falsely interpreted as adaptive. Conversely, adaptive and demographic processes might have been tightly associated and correcting for the population structure may lead to false negatives. Here, we evaluated this problem in the cosmopolitan weed Capsella bursa-pastoris. We used RNA-Seq to analyse gene expression differences among 24 accessions, which belonged to a much larger group that had been previously characterized for flowering time and circadian rhythm and were genotyped using genotyping-by-sequencing (GBS) technique. We found that clustering of accessions for gene expression retrieved the same three clusters that were obtained with GBS data previously, namely Europe, the Middle East and Asia. Moreover, the three groups were also differentiated for both flowering time and circadian rhythm variation. Correction for population genetic structure when analysing differential gene expression analysis removed all differences among the three grou...Continue Reading

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Citations

Apr 8, 2017·The Plant Journal : for Cell and Molecular Biology·Artem S KasianovAleksey A Penin
Jul 29, 2016·Molecular Biology Reports·Veeramuthu Dharanishanthi, Modhumita Ghosh Dasgupta
May 4, 2021·Ecological Applications : a Publication of the Ecological Society of America·Adrià López-BaucellsChristoph F J Meyer
Sep 7, 2021·Frontiers in Plant Science·Xiaojuan WangGuifang Zhao

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