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Lisle-sur-Tarn, France

Peterson A.,Martin Luther University of Halle Wittenberg | Harpke D.,Martin Luther University of Halle Wittenberg | Peruzzi L.,University of Pisa | Tison J.,Promenade des Baldaquins | And 2 more authors.
Plant Biosystems | Year: 2010

Gagea bohemica s.l. (Liliaceae) consists of two morphologically extreme forms (saxatilis and bohemica) which depending on the varying opinions of the authors are considered as separate species, subspecies or as a single variable species. In this study, morphological (form and length of perianth segments, pilosity of pedicles and peduncles) and molecular data (cpDNA trnL-trnF IGS) of 55 samples corresponding to 43 populations from Western Europe to the Mediterranean area and eastern Caucasus were investigated. G. bohemica (Zauschn.) Schult. & Schult. f. represents a highly variable monotypic species from both morphological and karyological (2n = 24, 36, 48, 60, 72) aspects. Based on the molecular and morphological data presented here, a differentiation between specific and infraspecific taxa is not possible. We hypothesize that the morphological variability of this species is largely influenced by different site conditions and ploidy level. © 2010 Società Botanica Italiana. Source

Peruzzi L.,University of Pisa | Peterson A.,Martin Luther University of Halle Wittenberg | Tison J.-M.,Promenade des Baldaquins | Harpke D.,Leibniz Institute of Plant Genetics and Crop Plant Research
Nordic Journal of Botany | Year: 2011

The typification of the name Gagea brentae Evers (a lectotype in GZU is designated here) and studies of living topotype material, led us to conclude that G. brentae is a full synonym of G. fragifera, sharing morphological, karyological (2n=84) and molecular (ITS region, trnL-trnF IGS, psbA-trnH IGS) features with the latter species. Gagea fragifera, as newly circumscribed here, shows a close relationship with G. villosa (M. Bieb.) Sweet and, above all, with G. glacialis K. Koch (possibly a hybridogenous taxon). In short, our new morphological and molecular data provide new evidence for hybridization and introgression between the closely related G. villosa and G. fragifera (both in G. sect. Didymobulbos). © 2011 The Authors. Nordic Journal of Botany © 2011 Nordic Society Oikos. Source

Gregor T.,Senckenberg Institute | Tison J.-M.,Promenade des Baldaquins | Garraud L.,Conservatoire Botanique National de Gap Charance
Candollea | Year: 2013

A neotype is chosen for the name Potentilla cinerea Vill. (Rosaceae) for which the nomenclatural history is given. The description of the taxon is also reported. © CONSERVATOIRE ET JARDIN BOTANIQUES DE GENÈVE 2013. Source

Tison J.-M.,Promenade des Baldaquins | Peterson A.,Martin Luther University of Halle Wittenberg | Harpke D.,Leibniz Institute of Plant Genetics and Crop Plant Research | Peruzzi L.,University of Pisa
Plant Systematics and Evolution | Year: 2013

The genus Gagea Salisb. is the largest amongst Liliaceae, including 50-300 species. This genus can be subdivided into at least 14 sections: among them, there is the species-rich, relatively late-branching monophyletic sect. Didymobulbos. Most of species and putative hybrids within this section were included in this study for a total of about 148 accessions (corresponding to 35 taxa), almost all collected across the Euro-Mediterranean area. Thirty-seven morpho-anatomical and ontogenetic characters were considered, together with the cpDNA (trnL-trnF IGS, psbA-trnH IGS) and nrDNA (ITS region) molecular markers. Bayesian analysis revealed the phylogenetic relationships among Didymobulbos taxa, allowing us to demonstrate new circumscriptions of critical species complexes, such as those of G. chrysantha Schult. & Schult. f., G. dubia A. Terracc. and G. granatellii (Parl.) Parl. Also the prominent role played in this section by reticulate evolution is further highlighted: many taxa, often unexpectedly, are inferred to represent hybrids (31 % of investigated taxa). The division into series cannot be maintained as we found extensive molecular evidence of hybridization between them. A new taxonomic setting for Gagea sect. Didymobulbos is proposed, and five new species are described. © 2012 Springer-Verlag Wien. Source

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