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Université de Fribourg

Admixture mapping in interspecific Populus hybrids identifies classes of genomic architectures for phytochemical, morphological and growth traits

Bresadola, Luisa ; Caseys, Céline ; Castiglione, Stefano ; Buerkle, C. Alex ; Wegmann, Daniel ; Lexer, Christian

In: New Phytologist, 2019, vol. 223, no. 4, p. 2076–2089

The genomic architecture of functionally important traits is key to understanding the maintenance of reproductive barriers and trait differences when divergent populations or species hybridize. We conducted a genome-wide association study (GWAS) to study trait architecture in natural hybrids of two ecologically divergent Populus species. We genotyped 472 seedlings from a natural hybrid zone...

Université de Fribourg

Targeted Capture of Hundreds of Nuclear Genes Unravels Phylogenetic Relationships of the Diverse Neotropical Palm Tribe Geonomateae

Loiseau, Oriane ; Olivares, Ingrid ; Paris, Margot ; Harpe, Marylaure de La ; Weigand, Anna ; Koubínová, Darina ; Rolland, Jonathan ; Bacon, Christine D. ; Balslev, Henrik ; Borchsenius, Finn ; Cano, Angela ; Couvreur, Thomas L. P. ; Delnatte, César ; Fardin, Frédérique ; Gayot, Marc ; Mejía, Fabian ; Mota-Machado, Talita ; Perret, Mathieu ; Roncal, Julissa ; Sanin, Maria José ; Stauffer, Fred ; Lexer, Christian ; Kessler, Michael ; Salamin, Nicolas

In: Frontiers in Plant Science, 2019, vol. 10, p. -

The tribe Geonomateae is a widely distributed group of 103 species of Neotropical palms which contains six ecologically important understory or subcanopy genera. Although it has been the focus of many studies, our understanding of the evolutionary history of this group, and in particular of the taxonomically complex genus Geonoma, is far from complete due to a lack of molecular data....

Université de Fribourg

A dedicated target capture approach reveals variable genetic markers across micro- and macro-evolutionary time scales in palms

de La Harpe, Marylaure ; Hess, Jaqueline ; Loiseau, Oriane ; Salamin, Nicolas ; Lexer, Christian ; Paris, Margot

In: Molecular Ecology Resources, 2019, p. -

Understanding the genetics of biological diversification across micro‐ and macro‐ evolutionary time scales is a vibrant field of research for molecular ecologists as rapid advances in sequencing technologies promise to overcome former limitations. In palms, an emblematic, economically and ecologically important plant family with high diversity in the tropics, studies of diversification at...

Université de Fribourg

Molecular ecology studies of species radiations: current research gaps, opportunities and challenges

la Harpe, Marylaure de ; Paris, Margot ; Karger, Dirk N. ; Rolland, Jonathan ; Kessler, Michael ; Salamin, Nicolas ; Lexer, Christian

In: Molecular Ecology, 2017, p. -

Understanding the drivers and limits of species radiations is a crucial goal of evolutionary genetics and molecular ecology, yet research on this topic has been hampered by the notorious difficulty of connecting micro- and macroevolutionary approaches to studying the drivers of diversification. To chart the current research gaps, opportunities and challenges of molecular ecology approaches to...

Université de Fribourg

Adaptive evolution and segregating load contribute to the genomic landscape of divergence in two tree species connected by episodic gene flow

Christe, Camille ; Stölting, Kai N. ; Paris, Margot ; Fraїsse, Christelle ; Bierne, Nicolas ; Lexer, Christian

In: Molecular Ecology, 2017, vol. 26, no. 1, p. 59–76

Speciation often involves repeated episodes of genetic contact between divergent populations before reproductive isolation (RI) is complete. Whole-genome sequencing (WGS) holds great promise for unravelling the genomic bases of speciation. We have studied two ecologically divergent, hybridizing species of the ‘model tree’ genus Populus (poplars, aspens, cottonwoods), Populus alba and P....

Université de Fribourg

Causes and consequences of large clonal assemblies in a poplar hybrid zone

Macaya-Sanz, David ; Heuertz, Myriam ; Lindtke, Dorothea ; Vendramin, Giovanni G. ; Lexer, Christian ; González-Martínez, andSantiago C.

In: Molecular Ecology, 2016, vol. 25, no. 21, p. 5330–5344

Asexual reproduction is a common and fundamental mode of reproduction in plants. Although persistence in adverse conditions underlies most known cases of clonal dominance, proximal genetic drivers remain unclear, in particular for populations dominated by a few large clones. In this study, we studied a clonal population of the riparian tree Populus alba in the Douro river basin (northwestern...