A5067453152- Plant and animal studies
- Plant Reproductive Biology
- Ecology and Vegetation Dynamics Studies
- Genetic diversity and population structure
- Chromosomal and Genetic Variations
- Evolution and Genetic Dynamics
- Plant Molecular Biology Research
- Plant Parasitism and Resistance
- Coastal wetland ecosystem dynamics
- Plant responses to water stress
- Plant Disease Resistance and Genetics
- Forest Insect Ecology and Management
- Banana Cultivation and Research
- Insect and Arachnid Ecology and Behavior
- Plant Taxonomy and Phylogenetics
- Plant Pathogens and Resistance
- Allelopathy and phytotoxic interactions
- Plant Virus Research Studies
- Genomics and Phylogenetic Studies
- Bacteriophages and microbial interactions
- Photosynthetic Processes and Mechanisms
- Plant Physiology and Cultivation Studies
- Plant Ecology and Taxonomy Studies
- Indigenous Studies and Ecology
- Genetic Mapping and Diversity in Plants and Animals
University of Konstanz
2015-2024
University of Glasgow
2008-2012
Centro de Investigação em Biodiversidade e Recursos Genéticos
2010-2012
Universidade do Porto
2011
University of Amsterdam
2004-2010
York University
2010
Abstract Tetraploid inheritance has two extremes: disomic in allotetraploids and tetrasomic autotetraploids. The possibility of mixed, or intermediate, models generally been neglected. These could well apply to newly formed hybrids diploidizing (auto)tetraploids. We present a simple likelihood-based approach that is able incorporate disomic, tetrasomic, intermediate estimates the double-reduction rate. Our model shows microsatellite markers natural tetraploids Rorippa amphibia R. sylvestris...
Proline accumulation is a widespread response of plants to salt stress as well drought and cold stress. In most plant species, two isoforms pyrroline-5-carboxylate synthetase (P5CS) catalyze the first step in proline biosynthesis from glutamate. Arabidopsis, these differ their spatial temporal expression patterns, suggesting sub-functionalization. P5CS1 has been identified major contributor stress-induced accumulation, whereas P5CS2 considered important for embryo development growth....
Analysis of population genetic structure has become a standard approach in genetics. In polyploid complexes, clustering analyses can elucidate the origin populations and patterns admixture between different cytotypes. However, combining diploid data theoretically lead to biased inference with (artefactual) by ploidy. We used simulated mixed-ploidy (diploid-autotetraploid) systematically compare performance k-means model-based methods implemented Structure, Admixture, FastStructure InStruct...
Theoretical and empirical comparisons of molecular diversity in selfing outcrossing plants have primarily focused on long-term consequences differences mating system (between species). However, improving our understanding the causes evolution requires ecological genetic studies early stages transition. Here, we examine nuclear chloroplast DNA sequences microsatellite variation a large sample populations Arabidopsis lyrata from Great Lakes region Eastern North American that show intra-...
Abstract The genetic breakdown of self-incompatibility (SI) and subsequent mating system shifts to inbreeding has intrigued evolutionary geneticists for decades. Most our knowledge is derived from interspecific comparisons between species their outcrossing relatives, where inferences may be confounded by secondary mutations that arose after the initial loss SI. Here, we study an intraspecific SI its consequences in North American Arabidopsis lyrata test whether: (1) particular S -locus...
Self-fertilization and admixture of genotypes from different populations can have major fitness consequences in native species. However, few studies addressed their potential roles invasive Here, we used plants Mimulus guttatus seven North American, three Scottish four New Zealand to address this. We created seeds self-fertilization, within-population outcrossing, between-population outcrossing within the same range, between ranges. A greenhouse experiment showed that M. suffered similar...
Introduction The transition from cross-fertilisation (outcrossing) to self-fertilisation (selfing) frequently coincides with changes towards a floral morphology that optimises self-pollination, the selfing syndrome. Population genetic studies have reported existence of both outcrossing and populations in Arabis alpina (Brassicaceae), which is an emerging model species for studying molecular basis perenniality local adaptation. It unknown whether its evolved Methods Using macro-photography,...
The novel-weapons hypothesis predicts that some plants are successful invaders because they release allelopathic compounds highly suppressive to naïve competitors in invaded ranges but relatively ineffective against the native range. For its part, evolution of enhanced weaponry invasive populations may evolve increased expression compounds. However, these predictions have rarely been tested empirically.Here, we made aqueous extracts roots and shoots (North American) (European) Brassica nigra...
Breakdown of self-incompatibility has frequently been attributed to loss-of-function mutations alleles at the locus responsible for recognition self-pollen (i.e. S-locus). However, other potential causes have rarely tested. Here, we show that self-compatibility S
Abstract The frequency of polyploidy increases with latitude in the Northern Hemisphere, especially deglaciated, recently colonized areas. cause or causes this pattern are largely unknown, but a greater genetic diversity individual polyploid plants due to doubled genome and/or hybrid origin is seen as likely factor underlying selective advantages related life extreme climates colonization ability. A history itself, well recent origin, and possibly limited number polyploidization events would...
Abstract Through its potential to enhance progeny performance, admixture (between‐population crossing) may promote invasiveness of alien plants. The few studies that tested this idea found evidence for heterosis (positive effects admixture) in the first generation (F 1 ), but have not considered further generations. In paper, we test whether benefits can be maintained subsequent generations an invasive plant. We follow up on a previous study, which made crosses between plants Mimulus...
Abstract Mating system shifts from outcrossing to selfing are frequent in plant evolution. Relative outcrossing, is associated with reduced parental conflict over seed provisioning, which may result postzygotic, asymmetric, reproductive isolation crosses between populations of different mating systems. To test the hypothesis that post-pollination increases increasing differences and predicted conflict, we performed a crossing experiment involving all combinations three self-compatible (with...
Arabidopsis lyrata is mostly outcrossing due to a sporophytic self-incompatibility (SI) system but around the Great Lakes of North America some populations have experienced loss SI. We researched SI in phylogeographic context. used cpDNA and microsatellite markers test if North-American A. different (recent) histories, linked this with individually established selfing phenotype population level realized rates calculated based on variation progeny arrays at multi-locus markers. found three...
The creation of intergeneric somatic hybrids between
Abstract Angiosperms are believed to have emerged initially in the tropics and expanded their distribution range poleward through diverse mechanisms, for example polyploidization‐driven cold tolerance evolution. Reversed expansion from temperate pan‐tropic climates a shift heat remains largely unknown. Here, we found autopolyploidy relation global of Solidago canadensis its temperate‐climate native North American hot‐summer climate an introduced range. Our cytogeographical study 2,062...
• The river floodplain species Rorippa amphibia, sylvestris, and their hybrid Rorippa× anceps were studied here, with the aim of identifying potential differences respect to flooding tolerance, assessing expression in F1 hybrids. Parents hybrids subjected three treatments mimicking natural conditions, growth-related leaf morphological traits compared. In contrast R. amphibia responded waterlogging by forming specialized roots, its growth was not reduced. These dominantly expressed Both...
Abstract In their recent article, Albertin et al. (2009) suggest an autotetraploid origin of 10 tetraploid strains baker’s yeast ( Saccharomyces cerevisiae ), supported by the frequent observation double reduction meiospores. However, presented inheritance results were puzzling and seemed to contradict authors’ interpretation that segregation ratios support a tetrasomic model inheritance. Here, we provide overview expected at tetrad meiospore level given scenarios strict disomic inheritance,...
SUMMARY The evolution of increased competitive ability ( EICA ) hypothesis predicts that release from specialist herbivores enables invasive plants to evolve growth. most powerful tests are provided by approaches simultaneously assess the effects herbivory and interactions. However, such extremely rare, hence how simultaneous root shoot influence remains little understood. Here, we tested whether invasive‐range Brassica nigra have evolved ability, expression depends on separate herbivory. To...
Hermaphroditic plants can potentially self-fertilize, but most possess adaptations that promote outcrossing. However, evolutionary transitions to higher selfing rates are frequent. Selfing comes with a transmission advantage over outcrossing, self-progeny may suffer from inbreeding depression, which forms the main barrier evolution of rates. Here, we assessed depression in North American herb Arabidopsis lyrata, is normally self-incompatible, low frequency self-compatible plants. few...
Many invasive species have rapidly adapted to different environments in their new ranges. This is surprising, as colonization usually associated with reduced genetic variation. Heritable phenotypic variation an epigenetic basis may explain this paradox.Here, we assessed the contribution of DNA methylation local adaptation native and naturalized non-native ruderal plant Germany. We reciprocally transplanted offspring from natural populations seven five between Konstanz region south Potsdam...