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Université de Fribourg

Molecular biogeography of prickly lettuce (lactuca serriola l.) shows traces of recent range expansion

D’Andrea, Luigi ; Meirmans, Patrick ; Wiel, Clemens van de ; Guadagnuolo, Roberto ; Treuren, Robbert van ; Kozlowski, Gregor ; Nijs, Hans den ; Felber, François

In: Journal of Heredity, 2017, vol. 108, no. 2, p. 194–206

Prickly lettuce (Lactuca serriola L., Asteraceae), a wild relative of cultivated lettuce, is an autogamous species which greatly expanded throughout Western and Northern Europe during the last 2 centuries. Here, we present a large-scale biogeographic genetic analysis performed on a dataset represented by 2622 individuals from 110 wild European populations. Thirty-two maternally inherited...

Université de Neuchâtel

Genetic (RAPD) Diversity between Oleria onega agarista and Oleria onega ssp. (Ithomiinae, Nymphalidae, Lepidoptera) in North-Eastern Peru

Gallusser, S. ; Guadagnuolo, Roberto ; Rahier, Martine

In: Genetica, 2004, vol. 121, no. 1, p. 65-74

Oleria onega agarista Felder and Felder and Oleria onega ssp. nov. are two Ithomiinae subspecies from north-eastern Peru, that differ for some morphological and behavioural traits. Two contact zones are known near the town of Tarapoto: Ahuashiyacu, where both subspecies cohabit but do not seem to hybridise, and Estero (near the village of Shapaja), where they apparently...

Université de Neuchâtel

Spontaneous gene flow and population structure in wild and cultivated chicory, Cichorium intybus L.

Kiær, L. P. ; Felber, François ; Flavell, A. ; Guadagnuolo, Roberto ; Guiatti, D. ; Hauser, T. P. ; Olivieri, A. M. ; Scotti, I. ; Syed, N. ; Vischi, M. ; van de Wiel, C. ; Jørgensen, R. B.

In: Genetic Resources and Crop Evolution, 2008, p. 1-15

Spontaneous gene flow between wild and cultivated chicory, Cichorium intybus L. , may have implications for the genetic structure and evolution of populations and varieties. One aspect of this crop-wild gene flow is the dispersal of transgenes from genetically modified varieties, e.g. gene flow from GM chicory to natural chicory could have unwanted consequences. With the purpose to...

Université de Neuchâtel

Spontaneous Hybridization between Maize and Teosinte

Ellstrand, Norman C. ; Garner, Lauren C. ; Hegde, Subray ; Guadagnuolo, Roberto ; Blancas, Lesley

In: Journal of Heredity, 2007, vol. 98, no. 2, p. 183-187

The closest wild relatives of maize, Zea mays ssp. mays are various Zea taxa known as "teosinte." Hybrids between maize and the teosinte taxon, Zea mays ssp. mexicana, often occur when the 2 are sympatric in Mexico. Measuring the spontaneous hybridization rate of the 2 taxa would shed light on the mechanisms contributing to the evolution and persistence of these hybrid...

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

Specific genetic markers for wheat, spelt, and four wild relatives: comparison of isozymes, RAPDs, and wheat microsatellites

Guadagnuolo, Roberto ; Savova-Bianchi, Dessislava ; Felber, François

In: Genome, 2001, vol. 44, no. 4, p. 610–621

Three types of markers—isozymes, RAPDs (random amplified polymorphic DNAs), and wheat microsatellites—were tested on wheat, spelt, and four wild wheat relatives (Aegilops cylindrica, Elymus caninus, Hordeum marinum, and Agropyron junceum). The aim was to evaluate their capability to provide specific markers for differentiation of the cultivated and wild species....

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

Genetic and Ecological Consequences of Transgene Flow to the Wild Flora

Felber, François ; Kozlowski, Gregor ; Arrigo, Nils ; Guadagnuolo, Roberto

In: Advances in Biochemical Engineering/Biotechnology, 2007, vol. 107, p. 173-205

Gene flow from crops to wild relatives by sexual reproduction is one of the major issues in risk assessment for the cultivation of genetically engineered (GE) plants. The main factors which influence hybridization and introgression, the two processes of gene flow, as well as the accompanying containment measures of the transgene, are reviewed. The comparison of risks between Switzerland and...

Université de Neuchâtel

Introgression of wheat DNA markers from A, B and D genomes in early generation progeny of Aegilops cylindrica Host × Triticum aestivum L. hybrids

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

In: TAG Theoretical and Applied Genetics, 2005, vol. 111, no. 7, p. 1338-1346

Introgression from allohexaploid wheat (Triticum aestivum L., AABBDD) to allotetraploid jointed goatgrass (Aegilops cylindrica Host, CCDD) can take place in areas where the two species grow in sympatry and hybridize. Wheat and Ae. cylindrica share the D genome, issued from the common diploid ancestor Aegilops tauschii Coss. It has been proposed that the A and B genome...