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Université de Neuchâtel

Transposable element and genome evolution following hybridization in wild wheats

Senerchia, Natacha ; Parisod, Christian (Dir.) ; Kessler, Félix (Codir.) ; Felber, François (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2014.

Genome dynamics is an essential process of eukaryote genome evolution. Hybridization and inter-species gene flow result in new interactions among divergent genomes and may reveal genetic incompatibilities having accumulated after the origin of species. Being highly mutagenic and repressed by various epigenetic mechanisms, transposable elements (TEs) are postulated to play a central role in...

Université de Fribourg

Sympatric bromeliad species (Pitcairnia spp.) facilitate tests of mechanisms involved in species cohesion and reproductive isolation in Neotropical inselbergs

Palma-Silva, Clarisse ; Wendt, T. ; Pinheiro, Fábio ; Barbará, Thelma ; Fay, Michael F. ; Cozzolino, Salvatore ; Lexer, Christian

In: Molecular Ecology, 2011, vol. 20, no. 15, p. 3185–3201

The roles of intra- and interspecific gene flow in speciation and species evolution are topics of great current interest in molecular ecology and evolutionary biology. Recent modelling studies call for new empirical data to test hypotheses arising from the recent shift from a ‘whole-genome reproductive isolation’ view to a ‘genic’ view of species and speciation. Particularly scarce (and...

Université de Fribourg

Genetic structure and introgression in riparian populations of Populus alba L.

Castiglione, S. ; Cicatelli, A. ; Lupi, R. ; Patrignani, G. ; Fossati, T. ; Brundu, G. ; Sabatti, M. ; Loo, M. van ; Lexer, Christian

In: Plants Biosystems, 2010, vol. 144, no. 3, p. 656-668

White poplar (Populus alba) is a widespread species of the northern hemisphere. Introgressed populations or hybrid zones with the related species of the European aspen (Populus tremula) have been suggested as potential venues for the identification of functionally important variation for germplasm conservation, restoration efforts and tree breeding. Data on the genetic diversity and structure of...

Université de Neuchâtel

Hybridization rates between lettuce (Lactuca sativa) and its wild relative (L. serriola) under field conditions

D'Andrea, Luigi ; Felber, François ; Guadagnuolo, Roberto

In: Environmental Biosafety Research, 2008, vol. 7, p. 61-71

Hybridization and introgression between crops and wild relatives may have important evolutionary and ecological consequences such as gene swamping or increased invasiveness. In the present study, we investigated hybridization under field conditions between crop lettuce (Lactuca sativa) and its wild relative prickly lettuce (L. serriola), two cross-compatible, predominantly...

Université de Neuchâtel

Relative Fitness of Transgenic vs. Non-Transgenic Maize x Teosinte Hybrids: a Field Evalutation

Clegg, J. ; Ellstrand, N. C. ; Guadagnuolo, Roberto

In: Ecological Applications, 2006, vol. 16, no. 5, p. 1967-1974

Concern has been often expressed regarding the impact and persistence of transgenes that enter wild populations via gene flow. The impact of a transgene and its persistence are largely determined by the relative fitness of transgenic hybrids and hybrid derivatives compared to non-transgenic plants. Nevertheless, few studies have addressed this question experimentally in the field. Despite the...

Université de Neuchâtel

Gene flow from wheat (Triticum aestivum L.) to jointed goatgrass (Aegilops cylindrica Host.), as revealed by RAPD and microsatellite markers

Guadagnuolo, Roberto ; Savova-Bianchi, D. ; Felber, François

In: TAG Theoretical and Applied Genetics, 2001, vol. 103, no. 1, p. 1-8

In order to estimate the potential of gene flow between wheat (Triticum æstivum L.) and jointed goatgrass (Aegilops cylindrica Host.), we carried out mixed pollinations in experimental and natural conditions. A set of species-specific RAPD (random amplified polymorphic DNA) and microsatellite markers were used to detect the presence of parental markers in the progeny of the plants...

Université de Neuchâtel

Search for evidence of introgression of wheat (Triticum aestivum L.) traits into sea barley (Hordeum marinum s.str. Huds.) and bearded wheatgrass (Elymus caninus L.) in central and northern Europe, using isozymes, RAPD and microsatellite markers

Guadagnuolo, Roberto ; Savova-Bianchi, D. ; Keller-Senften, J. ; Felber, François

In: TAG Theoretical and Applied Genetics, 2001, vol. 103, no. 2-3, p. 191-196

Seeds of English and Austrian populations of bearded wheatgrass (Elymus caninus L.) and sea barley (Hordeum marinum Huds.) growing in the vicinity of wheat (Triticum aestivum L.) fields were collected in order to search for evidence of the introgression of wheat traits into these wild relatives. Seeds were sown and plants grown for subsequent analyses using morphological and...

Université de Neuchâtel

Genetic and ecological aspects of gene flow from wheat (Triticum aestivum L.) to Aegilops L. species

Schoenenberger, Nicola ; Küpfer, Philippe (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2005 ; 1872.

Genetic and ecological aspects of gene flow from wheat (Triticum aestivum L.) to Aegilops L. species Hybridisation and introgression from crops to wild relatives is a key issue in risk assessment. In the present study, hybridisation and introgression dynamics from hexaploid wheat (2n=42) to tetraploid Aegilops species (2n=28) were investigated by experiments in natural conditions or in the...