Dépouillements

Impact of interspecific hybridization within a polyploid agamic complex of Pilosella (Asteraceae, Cichorieae) in Bulgaria compared with Central Europe / Anna Krahulcová in Willdenowia, vol. 48, n°3 (Année 2018)

Public [article]  inWilldenowia > vol. 48, n°3 (Année 2018) . - pp. 345-362 Titre : Impact of interspecific hybridization within a polyploid agamic complex of Pilosella (Asteraceae, Cichorieae) in Bulgaria compared with Central Europe Type de document : texte imprimé Auteurs : Anna Krahulcová, Auteur ; Frantisek Krahulec, Auteur ; Vladimir Vladimirov, Auteur Année de publication : 2018 Article en page(s) : pp. 345-362 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Hieracium [Espèces (in biblio)] Pilosella [ZG] Europe centrale [Thèmes] Apomixie Mots-clés : Cichorieae  hybridation  microévolution  ploïdie  reproduction  gamète Résumé : "The species-mixed Pilosella populations comprising diploid sexual and polyploid facultatively apomictic biotypes were studied in Bulgaria. Parentage of co-occurring recent hybrids was inferred from a combination of morphology and ploidy level that corresponded to simple/multiple crosses of basic species via either reduced or unreduced gametes. The flow cytometric seed screening illustrated the capacity for heteroploid hybridization both in open-pollinated plants in the mixed-ploidy populations and in crossing experiments. The diploid sexual species in Bulgaria have a limited impact on interspecific hybridization, and simple inter-cytotype hybrids are only sporadically formed. The origin of the most common hybrids in Bulgaria that are apomictic and retain the pentaploid/hexaploid ploidy level of a co-occurring putative apomictic parent remains unclear. The absence of stabilized hybridogeneous species and scarcity of commonly hybridizing polyploid sexual biotypes are crucial attributes that distinguish the Pilosella populations in Bulgaria from those in the Czech Republic and Germany. No recent high-polyploid hybrids of 2n + n origin that would potentially become drivers of ongoing hybridization in the mixed sexual-apomictic Pilosella populations similar to those in Central Europe have been recorded in Bulgaria. The pattern of co-occurring cytotypes in Bulgaria likely limits interspecific hybridization due to stronger ploidy barriers." (source : auteurs) Type de publication : périodique Référence biblio : Krahulcová A., Krahulec F., Vladimirov V., 2018 - Impact of interspecific hybridization within a polyploid agamic complex of Pilosella (Asteraceae, Cichorieae) in Bulgaria compared with Central Europe. Willdenowia, 48 (3) : 345-362. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68062 [article]

Exemplaires(1)

Cote	Localisation	Disponibilité
P0170	Brest	Exclu du prêt

Taxonomie revision of selected species in Taraxacum sect. Erythrosperma (Asteraceae, Cichorieae) from the E Mediterranean region / Jan Štepánek in Willdenowia, vol. 48, n°3 (Année 2018)

Public [article]  inWilldenowia > vol. 48, n°3 (Année 2018) . - pp. 365-369 Titre : Taxonomie revision of selected species in Taraxacum sect. Erythrosperma (Asteraceae, Cichorieae) from the E Mediterranean region Type de document : texte imprimé Auteurs : Jan Å tepánek, Auteur ; Jan Kirschner, Auteur Année de publication : 2018 Article en page(s) : pp. 365-369 Langues : Anglais (eng) Résumé : "Selected species in Taraxacum F. H. Wigg., belonging to T. sect. Erythrosperma (H. Lindb.) Dahlst., described by C. E. Sonck, G. E. Haglund and A. J. Richards, were revised taxonomically. The types of their names were compared with plant material mainly from the Balkan Peninsula and Crimea. The main sources of material were ample collections of R. Willing and E. Willing from Greece (deposited at B), and plants collected and/or cultivated by us from the Balkan Peninsula and Crimea (deposited at PRA). Four names are relegated to synonymy. Taraxacumamborum G. E. Hagl. is newly interpreted and lectotypified, and T. viale Sonck is synonymized with it. Taraxacumedessicum Sonck and T. aestuans Sonck were found to be conspecific with T. salonikiense Sonck. Taraxacumgionense A. J. Richards belongs to T. botanicorum Sonck. Range extensions include T. salonikiense in Albania, T.amborum in Bulgaria, Montenegro and Romania, and T. egnatiae from Ukraine." Type de publication : périodique Référence biblio : Å tepánek J., Kirschner J., 2018 - Taxonomie revision of selected species in Taraxacum sect. Erythrosperma (Asteraceae, Cichorieae) from the E Mediterranean region. Willdenowia, 48 (3) : 365-369. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68064 [article]

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Cote	Localisation	Disponibilité
P0170	Brest	Exclu du prêt

Identity and relationships of Sempervivum tectorum (Crassulaceae) in the Rhine Gorge area / Armin G. Fabritzek in Willdenowia, vol. 48, n°3 (Année 2018)

Public [article]  inWilldenowia > vol. 48, n°3 (Année 2018) . - pp. 405-414 Titre : Identity and relationships of Sempervivum tectorum (Crassulaceae) in the Rhine Gorge area Type de document : texte imprimé Auteurs : Armin G. Fabritzek, Auteur Année de publication : 2018 Article en page(s) : pp. 405-414 Langues : Allemand (ger) Catégories : [Espèces (in biblio)] Sempervivum tectorum [Thèmes] Alpes [Thèmes] Massif central [Thèmes] Pyrénées Mots-clés : Gorges du Rhin  génotypage par séquençage  Quaternaire Résumé : "Sempervivum teetorum (Crassulaceae), an orophyte widespread in the European high mountains, also grows in rocky habitats of the Rhine Gorge area (Upper Middle Rhine, Mosel and Ahr river valleys). On the background of its long history of cultivation, it is unclear whether S. teetorum is native or naturalized in the Rhine Gorge area. Using 52 accessions of S. teetorum from across its geographical range (except SE Europe) as well as 15 samples of S. ealeareum and S. marmoreum in our final sample, we conducted a genotyping-by-sequencing analysis. The genetic data were used for the identification of genetic groups and for the reconstruction of phylogenetic relationships. We found that the material from the Rhine Gorge area forms a homogeneous genetic group that is clearly distinct from populations from the Massif Central, Alps and Pyrenees. The Rhine Gorge material appears to be most closely related to material from the Massif Central. We hypothesize that the disjunct distribution of the Rhine Gorge/Massif Central clade is best interpreted as the remnant of a formerly wider distribution area obtained in a Quaternary glacial. The possibility of recognizing Rhine Gorge material taxonomically is discussed and rejected for morphological and nomenclatural reasons." (source : auteur) Type de publication : périodique Référence biblio : Fabritzek A., 2018 - Identity and relationships of Sempervivum tectorum (Crassulaceae) in the Rhine Gorge area. Willdenowia, 48 (3) : 405-414. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68076 [article]

Exemplaires(1)

Cote	Localisation	Disponibilité
P0170	Brest	Exclu du prêt