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Morphological and cytological variation in Spergularia echinosperma and S. rubra, and notes on potential hybridization of these two species / Pavel Kur in Preslia, vol. 84 (Année 2012)

Public [article]  inPreslia > vol. 84 (Année 2012) . - pp. 905-924 Titre : Morphological and cytological variation in Spergularia echinosperma and S. rubra, and notes on potential hybridization of these two species Auteurs : Pavel Kur, Auteur ; Milan Stech, Auteur ; Petr Koutecky, Auteur ; Pavel Travnicek, Auteur Année de publication : 2012 Article en page(s) : pp. 905-924 Langues : Anglais (eng) Catégories : [ZG] République tchèque Use for events after 1992. [Espèces (in biblio)] Spergularia echinosperma [Espèces (in biblio)] Spergularia echinosperma (Celak.) Asch. & Graebn. [Espèces (in biblio)] Spergularia rubra (L.) J.Presl & C.Presl Mots-clés : allopolyploïdie  classification  analyse discriminante linéaire (ADL)  flow cytometry  genome size  inter-ploidy hybridization  morphometric analysis  cytologie Résumé : "Morphological and cytological variation in Spergularia echinosperma and S. rubra and the possibility of these two species hybridizing were investigated. The plant material was collected mainly in the western- and southern-Bohemian pond basins where S. echinosperma is most abundant. Using flow cytometry, we found diploid and tetraploid cytotypes among plants morphologically identified as Type de publication : périodique Référence biblio : Kur P., Stech M., Koutecky P., Travnicek P., 2012 - Morphological and cytological variation in Spergularia echinosperma and S. rubra, and notes on potential hybridization of these two species. Preslia, 84 : 905-924. ID PMB : 55658 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=55658 [article]

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No evidence of contemporary interploidy gene flow between the closely related European woodland violets Viola reichenbachiana and V. riviniana (sect. Viola, Violaceae) / Grzegorz Migdalek in Plant biology, vol. 19, n°4 (Juillet 2017)

Public [article]  inPlant biology > vol. 19, n°4 (Juillet 2017) . - pp. 542-551 Titre : No evidence of contemporary interploidy gene flow between the closely related European woodland violets Viola reichenbachiana and V. riviniana (sect. Viola, Violaceae) Type de document : texte imprimé Auteurs : Grzegorz Migdalek, Auteur ; Justyna Nowak, Auteur ; Marta Saluga, Auteur ; Elzbieta Cieslak, Auteur ; Magdalena Szczepaniak, Auteur ; Michal Ronikier, Auteur ; Thomas Marcussen, Auteur ; Aneta Slomka, Auteur ; Elzbieta Kuta, Auteur Année de publication : 2017 Article en page(s) : pp. 542-551 Langues : Anglais (eng) Mots-clés : Viola  allopolyploïdie  genetic relationships  haplotypes  hybridisation  introgression  gène Résumé : "Viola reichenbachiana (2n = 4x = 20) and V. riviniana (2n = 8x = 40) are closely related species widely distributed in Europe, often sharing the same habitat throughout their overlapping ranges. It has been suggested in numerous studies that their high intraspecific morphological variability and plasticity might have been further increased by interspecific hybridisation in contact zones, given the sympatry of the species and the incomplete sterility of their hybrid. The aims of this study were to: (i) confirm that V. reichenbachiana and V. riviniana have one 4x genome in common, and (ii) determine the impact of hybridisation and introgression on genetic variation of these two species in selected European populations. For our study, we used 31 Viola populations from four European countries, which were analysed using AFLP and sequencing of a variable plastid intergenic spacer, trnH-psbA. Our analysis revealed that V. reichenbachiana exhibited larger haplotype diversity, having three species-specific haplotypes versus one in V. riviniana. The relationships among haplotypes suggest transfer of common haplotypes into V. riviniana from both V. reichenbachiana and hypothetically the other, now extinct, parental species. AFLP analysis showed low overall genetic diversity of both species, with V. riviniana showing higher among-population diversity. None of the morphologically designated hybrid populations had additive AFLP polymorphisms that would have indicated recent hybridisation. Also, kinship coefficients between both species did not indicate gene flow. V. riviniana showed significant population subdivision and significant isolation by distance, in contrast to V. reichenbachiana. The results indicate lack of gene flow between species, high influence of selfing on genetic variability, as well as probably only localised introgression toward V. riviniana." (source : auteurs) Type de publication : périodique Référence biblio : Migdalek G., Nowak J., Saluga M., Cieslak E., Szczepaniak M., Ronikier M., Marcussen T., Slomka A., Kuta E., 2017 - No evidence of contemporary interploidy gene flow between the closely related European woodland violets Viola reichenbachiana and V. riviniana (sect. Viola, Violaceae). Plant biology, 19 (4) : 542-551. ID PMB : 65919 DOI : 10.1111/plb.12571 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65919 [article]

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Northern Hemisphere disjunctions in Lactuca (Cichorieae, Asteraceae) : independent Eurasia to North America migrations and allopolyploidization / Kathy E. Jones in Willdenowia, vol. 48, n°2 (Année 2018)

Public [article]  inWilldenowia > vol. 48, n°2 (Année 2018) . - pp. 259-284 Titre : Northern Hemisphere disjunctions in Lactuca (Cichorieae, Asteraceae) : independent Eurasia to North America migrations and allopolyploidization Type de document : texte imprimé Auteurs : Kathy E. Jones, Auteur ; Edward E. Schilling, Auteur ; Elisabete F. Dias, Auteur ; Norbert Kilian, Auteur Année de publication : 2018 Article en page(s) : pp. 259-284 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Lactuca [Thèmes] Biogéographie Mots-clés : Cichorieae  allopolyploïdie  analyse des temps de divergence  hémisphère nord  phylogénétique  disjonction des plantes Résumé : "The Lactucalineage is one of nine lineages in the lettuce subtribe (Cichorieae, Asteraceae) distributed in Europe, Africa, Asia and North America. Within the Lactucalineage two clades show disjunct Eurasian-North American distributions. One disjunct clade consists of diploids (x= 8) and allotetraploids (x= 17), the former restricted to Eurasia and the latter to North America and the Azores. In contrast, members of the other Eurasian-North American disjunct clade are all diploid (x= 9), like the remainder of the Lactucalineage (diploid,x= 8 or 9). The aims of the present study were to investigate the migration pathways that led to the disjunct distributions of these two Eurasian-North American clades and the potential progenitors of the allopolyploid taxa. We conducted deep taxon sampling and multi-locus phylogenetic analyses using nuclear ribosomal DNA (ETS and ITS), a low-copy nuclear marker (A44) and five non-coding plastid markers. Divergence time estimations with BEAST and ancestral biogeographic estimations with BioGeoBEARS suggested that both lineages reached North America by the late Miocene. Cloning of the A44 region revealed two sequence copies within allopolyploid individuals that were resolved in divergent clades and this helped to identify potential progenitors. We provide competing hypotheses for the progenitor species and biogeographic pathways that gave rise to the allotetraploid lineage, and we propose a North American origin for the Azorean endemic. Taxonomic conclusions includeL. raminifoliavar.mexicanabeing raised to specific rank with the nameL. brachyrrhynchaand the alleged endemicL. jamaicensisin fact represents the SE AsianL. indica, introduced to Jamaica." (source : auteurs) Type de publication : périodique Référence biblio : Jones K., Schilling E., Dias E., Kilian N., 2018 - Northern Hemisphere disjunctions in Lactuca (Cichorieae, Asteraceae) : independent Eurasia to North America migrations and allopolyploidization. Willdenowia, 48 (2) : 259-284. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68060 [article]

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Cote	Localisation	Disponibilité
P0170	Brest	Exclu du prêt