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Research article - Peer-reviewed, 2022

How broad is the selfing syndrome? Insights from convergent evolution of gene expression across species and tissues in the Capsella genus

Zhang, Zebin; Kryvokhyzha, Dmytro; Orsucci, Marion; Glemin, Sylvain; Milesi, Pascal; Lascoux, Martin

Abstract

The shift from outcrossing to selfing is one of the main evolutionary transitions in plants. It is accompanied by profound effects on reproductive traits, the so-called selfing syndrome. Because the transition to selfing also implies deep genomic and ecological changes, one also expects to observe a genomic selfing syndrome. We took advantage of the three independent transitions from outcrossing to selfing in the Capsella genus to characterize the overall impact of mating system change on RNA expression, in flowers but also in leaves and roots. We quantified the extent of both selfing and genomic syndromes, and tested whether changes in expression corresponded to adaptation to selfing or to relaxed selection on traits that were constrained in outcrossers. Mating system change affected gene expression in all three tissues but more so in flowers than in roots and leaves. Gene expression in selfing species tended to converge in flowers but diverged in the two other tissues. Hence, convergent adaptation to selfing dominates in flowers, whereas genetic drift plays a more important role in leaves and roots. The effect of mating system transition is not limited to reproductive tissues and corresponds to both adaptation to selfing and relaxed selection on previously constrained traits.

Keywords

Capsella; convergent adaptation; gene expression; genomic and selfing syndromes; mating system change; relaxed selection

Published in

New Phytologist
2022, volume: 236, number: 6, pages: 2344-2357
Publisher: WILEY

Authors' information

Zhang, Zebin
Uppsala University
Kryvokhyzha, Dmytro
Uppsala University
Kryvokhyzha, Dmytro
Lund University
Uppsala University
Swedish University of Agricultural Sciences, Department of Plant Biology
Glemin, Sylvain
Uppsala University
Glemin, Sylvain
Universite de Rennes 1
Milesi, Pascal
Uppsala University
Milesi, Pascal
SciLifeLab
Lascoux, Martin
Uppsala University

UKÄ Subject classification

Evolutionary Biology
Botany

Publication Identifiers

DOI: https://doi.org/10.1111/nph.18477

URI (permanent link to this page)

https://res.slu.se/id/publ/119265