A5001086795- Genetic diversity and population structure
- Plant and animal studies
- Genetic Mapping and Diversity in Plants and Animals
- Fern and Epiphyte Biology
- Ecology and Vegetation Dynamics Studies
- Plant Diversity and Evolution
- Bioenergy crop production and management
- Genetic and phenotypic traits in livestock
- Plant Reproductive Biology
- Plant tissue culture and regeneration
- Sunflower and Safflower Cultivation
- Genomics and Phylogenetic Studies
- Forest ecology and management
- Chromosomal and Genetic Variations
- Plant and Fungal Species Descriptions
- Plant Pathogens and Fungal Diseases
- Botany and Plant Ecology Studies
- Plant Parasitism and Resistance
- Species Distribution and Climate Change
- Genetic and Environmental Crop Studies
- Horticultural and Viticultural Research
- Forest Insect Ecology and Management
- Botany, Ecology, and Taxonomy Studies
- Forest Management and Policy
- Ecology and Conservation Studies
University of Vienna
2015-2024
University of Fribourg
2009-2020
Royal Botanic Gardens, Kew
2004-2015
Ecologie & Evolution
2013
University of Bristol
2010
Imperial College London
2009
Indiana University Bloomington
2003-2007
University of Georgia
2003-2007
Portland State University
2007
University of British Columbia
2007
Hybridization is frequent in many organismal groups, but its role adaptation poorly understood. In sunflowers, species found the most extreme habitats are ancient hybrids, and new gene combinations generated by hybridization speculated to have contributed ecological divergence. This possibility was tested through phenotypic genomic comparisons of synthetic hybrids. Most trait differences hybrids could be recreated complementary action were favored selection. The same parental chromosomal...
Abstract The renewed interest in the use of hybrid zones for studying speciation calls identification and study across a wide range organisms, especially long‐lived taxa which it is often difficult to generate interpopulation variation through controlled crosses. Here, we report on extent direction introgression between two members ‘model tree’ genus Populus : alba (white poplar) tremula (European aspen), large zone sympatry located Danube valley. We genotyped 93 morphotypes samples from...
Selection experiments in the wild have greatly aided our understanding of how selection shapes phenotypic diversity natural populations. However, these been hindered by fact that traits most important to adaptation and speciation may be fixed within Experimental hybridization offers a means circumvent this problem since crosses can made between populations or species differ for trait interest. Here, we discuss advantages limitations approach, review results from published studies, suggest...
Abstract For a new diploid or homoploid hybrid species to become established, it must diverge ecologically from parental genotypes. Otherwise the neospecies will be overcome by gene flow competition. We initiated series of experiments designed understand how species, Helianthus paradoxus , was able colonize salt marsh habitats, when both its ( H. annuus × petiolaris ) are sensitive. Here, we report on results quantitative trait locus (QTL) analysis mineral ion uptake traits and survivorship...
The roles of intra- and interspecific gene flow in speciation species evolution are topics great current interest molecular ecology evolutionary biology. Recent modelling studies call for new empirical data to test hypotheses arising from the recent shift a 'whole-genome reproductive isolation' view 'genic' speciation. Particularly scarce (and thus particular interest) genetic on recently radiated, naturally hybridizing strongly structured species-rich environments. Here, we studied four...
Abstract Recent advances in population genomics have triggered great interest the genomic landscape of divergence taxa with ‘porous’ species boundaries. One important obstable previous studies this topic was low coverage achieved. This issue can now be overcome by use ‘next generation’ or short‐read DNA ‐sequencing approaches capable assaying many thousands single nucleotide polymorphisms ( SNP s) divergent species. We scanned genomes P opulus alba and tremula , two ecologically hybridizing...
Isolated granitic rock outcrops or 'inselbergs' may provide a window into the molecular ecology and genetics of continental radiations under simplified conditions, in analogy to use oceanic islands studies species radiations. Patterns variability gene flow inselberg have never been thoroughly evaluated comparison related taxa with more continuous distribution ranges, other same kingdom general. We nuclear microsatellites study population differentiation two diploid, perennial plants adapted...
Forest trees are an unparalleled group of organisms in their combined ecological, economic and societal importance. With widespread distributions, predominantly random mating systems large population sizes, most tree species harbour extensive genetic variation both within among populations. At the same time, demographic processes associated with Pleistocene climate oscillations land‐use change have affected contemporary range‐wide diversity may impinge on potential for future adaptation....
Abstract Natural hybrid zones in forest trees provide systems to study the transfer of adaptive genetic variation by introgression. Previous landscape genomic studies Populus trichocarpa , a keystone tree species, indicated footprints admixture with its sister species balsamifera and identified candidate genes for local adaptation. Here, we explored patterns introgression signals adaptation P. employing genome resequencing data from three chromosomes pure admixed individuals wild...
Natural hybrid zones have proven to be precious tools for understanding the origin and maintenance of reproductive isolation (RI) therefore species. Most available genomic studies using whole- or partial-genome resequencing approaches focused on comparisons parental source populations involved in genome admixture, rather than exploring fine-scale patterns chromosomal ancestry across full admixture gradient present between hybridizing We studied three well-known European 'replicate' Populus...
Abstract Domestication of clonally propagated crops such as pineapple from South America was hypothesized to be a ‘one-step operation’. We sequenced the genome Ananas comosus var. bracteatus CB5 and assembled 513 Mb into 25 chromosomes with 29,412 genes. Comparison genomes CB5, F153 MD2 elucidated genomic basis fiber production, color formation, sugar accumulation fruit maturation. also resequenced 89 genomes. Cultivars ‘Smooth Cayenne’ ‘Queen’ exhibited ancient recent admixture, while...
Abstract Diploid hybrid speciation in plants is often accompanied by rapid ecological divergence between incipient neospecies and their parental taxa. One plausible means which novel adaptation lineages may arise transgressive segregation, that is, the generation of extreme phenotypes exceed those lines. Early (BC2) hybrids two wild, annual sunflowers, Helianthus annuus petiolaris, were used to study directional selection on characters associated with origin paradoxus, a diploid species...
Microsatellite (simple sequence repeat, SSR) amplification was performed in eight different members of the Fagaceae family by using sets primers developed from sessile oak, Quercus petraea . In total, 136 cases heterologous were carried out, and 66% resulted interpretable products. From these, 12 PCR products sequenced all contained a homologous to original locus Q. Although SSR worked even across genera, with increasing evolutionary distance there clear tendency for decreasing ability...
Adaptation to new environments can start from mutations or standing variation already present in natural populations. Whether admixture constrains facilitates adaptation is largely unknown, especially ecological keystone foundation species. We examined patterns of neutral and adaptive population divergence Populus tremula L., a widespread forest tree, using mapped molecular genetic markers. detected the signature postglacial between Western an Eastern lineage P. Scandinavia, area suspected...