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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]

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Population based approaches in the study of Pilosella Hill (Asteraceae) : a new view of its taxonomy ? / Frantisek Krahulec

Public in Current taxonomic research on the British & European Flora (Leicester, 13-14 September 2003) / John Bailey (2006) Titre : Population based approaches in the study of Pilosella Hill (Asteraceae) : a new view of its taxonomy ? Type de document : texte imprimé Auteurs : Frantisek Krahulec, Auteur ; Anna Krahulcová, Auteur Importance : pp. 15-25 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Pilosella [Thèmes] Taxonomie Résumé : "We present a structure of the Pilosella populations occurring in the Krkonose Mts, northern Czech Republic. Each basic species, hybridogenous species and recent hybrid is documented by its frequency, cytotypes, breeding system, and chloroplast haplotypes. We compare this structure with the situation in another mountain range, the Sumava Mts in the south western Czech Republic. Both regions have the same structure ofhybridising species, but the resulting population are different. We de duce that random phenomena in the past and the residual sexuality of apomictic species has influenced the present population composition. Our results are discussed in connection with existing approaches to the taxonomy of Pilosella." (source : auteurs) Type de publication : article de livre Référence biblio : Krahulec F., Krahulcová A., 2006 - Population based approaches in the study of Pilosella Hill (Asteraceae) : a new view of its taxonomy ? In : Bailey J., Ellis G., Eds, 2006 - Current taxonomic research on the British & European Flora (Leicester, 13-14 September 2003). London : Botanical Society of the British Isles, 15-25. ID PMB : 6461 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=6461

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