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Selection against recombinant hybrids maintains reproductive isolation in hybridizing Populus species despite F1 fertility and recurrent gene flow

Christe, Camille ; Stölting, Kai N. ; Bresadola, Luisa ; Fussi, Barbara ; Heinze, Berthold ; Wegmann, Daniel ; Lexer, Christian

In: Molecular Ecology, 2016, p. -

Natural hybrid zones have proven to be precious tools for understanding the origin and maintenance of reproductive isolation (RI) and therefore species. Most available genomic studies of hybrid zones using whole or partial genome resequencing approaches have focused on comparisons of the parental source populations involved in genome admixture, rather than exploring fine-scale patterns of...

Genome-wide patterns of differentiation and spatially varying selection between postglacial recolonization lineages of Populus alba (Salicaceae), a widespread forest tree

Stölting, Kai N. ; Paris, Margot ; Meier, Cécile ; Heinze, Berthold ; Castiglione, Stefano ; Bartha, Denes ; Lexer, Christian

In: New Phytologist, 2015, vol. 207, no. 3, p. 723–734

Studying the divergence continuum in plants is relevant to fundamental and applied biology because of the potential to reveal functionally important genetic variation. In this context, whole-genome sequencing (WGS) provides the necessary rigour for uncovering footprints of selection. We resequenced populations of two divergent phylogeographic lineages of Populus alba (n = 48), thoroughly...

Recombinant hybrids retain heterozygosity at many loci: new insights into the genomics of reproductive isolation in Populus

Lindtke, Dorothea ; Buerkle, C. Alex ; Barbará, Thelma ; Heinze, Berthold ; Castiglione, Stefano ; Bartha, Denes ; Lexer, Christian

In: Molecular Ecology, 2012, p. -

The maintenance of species barriers in the face of gene flow is often thought to result from strong selection against intermediate genotypes, thereby preserving genetic differentiation. Most speciation genomic studies thus aim to identify exceptionally divergent loci between populations, but divergence will be affected by many processes other than reproductive isolation (RI) and speciation....

Genomic admixture analysis in european Populus spp. reveals unexpected patterns of reproductive isolation and mating

Lexer, Christian ; Joseph, Jeffrey A. ; Loo, Marcela van ; Barbará, Thelma ; Heinze, Berthold ; Bartha, Denes ; Castiglione, Stefano ; Fay, Michael F. ; Buerkle, C. Alex

In: Genetics, 2010, vol. 186, p. 699–712

Admixture between genetically divergent populations facilitates genomic studies of the mechanisms involved in adaptation, reproductive isolation and speciation, including mapping of the loci involved in these phenomena. Little is known about how pre- and postzygotic barriers will affect the prospects of 'admixture mapping' in wild species. We have studied 93 mapped genetic markers...

Phylogeography of Populus alba (L.) and Populus tremula (L.) in Central Europe: secondary contact and hybridisation during recolonisation from disconnected refugia

Fussi, Barbara ; Lexer, Christian ; Heinze, Berthold

In: Tree Genetics & Genomes, 2010, vol. 6, no. 3, p. 439-450

The central aim of this paper is to clarify the picture of postglacial recolonisation and the reconstruction of refugia of Populus alba (L.) and Populus tremula (L.) in the light of hybridisation of the two species. We focussed our study on Central and Southeastern Europe including reference samples from Spain, Sweden and Northern Africa.We investigated 414 individuals of 26 populations using...

Admixture facilitates adaptation from standing variation in the European aspen (Populus tremula L.), a widespread forest tree

Carvalho, Dulcineia de ; Ingvarsson, Pär K. ; Joseph, Jeffrey ; Suter, Leonie ; Sedivy, Claudio ; Macaya-Sanz, David ; Cottrell, Joan ; Heinze, Berthold ; Schanzer, Ivan ; Lexer, Christian

In: Molecular Ecology, 2010, vol. 19, no. 8, p. 1638-1650

The use of digital image-based morphometrics to study the phenotypic mosaic in taxa with porous genomes

Lexer, Christian ; Jeffrey, Joseph ; Loo, Marcela van ; Prenner, Gerhard ; Heinze, Berthold ; Chase, Mark W. ; Kirkup, Don

In: Taxon, 2009, vol. 58, no. 2, p. 349-364

Rapid recent developments in DNA sequencing and genetic marker technologies call for the establishment of cost-effective, automated phenotyping assays for evolutionary biology and systematics, so that the effects of DNA polymorphisms and epigenetic changes on the phenotype can be evaluated. We discuss the use of digital image-based morphometrics in evolutionary biology and systematics with...