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Auteur Bohumil Travnicek (TrávnÃček, Bohumil) |
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Natural hybridization between diploid Ficaria calthifolia and tetraploid Ficaria verna subsp. verna in central Europe : evidence from morphology, ecology and life-history traits / Ondrej Popelka in Preslia, vol. 91 (Année 2019)
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Titre : Natural hybridization between diploid Ficaria calthifolia and tetraploid Ficaria verna subsp. verna in central Europe : evidence from morphology, ecology and life-history traits Type de document : Livre Auteurs : Ondrej Popelka, Auteur ; Bohumil Travnicek (TrávnÃček, Bohumil), Auteur ; Pavla Siková (%u0160iková, Pavla), Auteur ; Michaela Jandová, Auteur ; Martin Duchoslav, Auteur Année de publication : 2019 Article en page(s) : pp. 179-212 Langues : Anglais Catégories : [Espèces (in biblio)] Ficaria calthifolia
[Espèces (in biblio)] Ficaria verna
[Thèmes] TaxonomieMots-clés : Ficaria × sellii bulbille cytométrie hybridation morphométrie phénologie viabilité du pollen polyploïdie Résumé : "The genusFicariais a taxonomically intricate group in which polyploidization and hybridizationcontribute to taxa diversification. Incentral Europe, populations of diploidF. calthifoliaandtetraploidF. vernasubsp.vernaoccasionally come into contact, which results in an interspecifictriploid hybrid, as recently demonstrated using molecular markers, genome size estimation andexperimental crossing. In this study, we aimedto estimate the frequency and distribution of thetriploid hybrid in central Europe, to identify those phenotypic traits that can be used to discrimi-nate between hybrid and parental taxa and compare the phenology, pollen viability, sexual andasexual reproduction and niche differentiation of the triploid hybrid and parental taxa. Flow-cytometry analyses of 1171 individuals sampledfrom 67 localities revealed that triploid hybridswere regularly found at 89% of the sites sampled where there were sympatric populations of bothparental taxa, with a mean percentage of 19.4% occurring at sites where there was a mixture ofcytotypes. No pure hybrid population was found. The hybrids were intermediate between theparental taxa in most morphological characters and did not show any novel morphological charac-ters. The characters that best differentiate the taxonomic groups were the production of axillarybulbils, aborted and well-developed achenes, leaf shape and plant habit. Almost all hybrids weresexually sterile: the pollen viability was considerably reduced (mean 8.4%) and on average 98%of the achenes were aborted. Local dispersal of the hybrids is possible through the production ofbulbils in the leaf axils, although the number of bulbils per node and the mean weight of one bulbilwere two and three times lower in the hybrid than inF. vernasubsp.verna.The hybrid niche wasintermediate between those of the parental taxa but shifted slightly towards that ofF. vernasubsp.verna. In addition, the taxonomic and nomenclatural treatment of the hybrid, which is describedasFicaria×selliiDuchoslav, Popelka et Trávn., as well as a key for identifying the central Euro-pean taxa ofFicaria, are presented." (source : auteurs) Type de publication : périodique Référence biblio : Popelka O., Travnicek B., Siková P., Jandová M., Duchoslav M., 2019 - Natural hybridization between diploid Ficaria calthifolia and tetraploid Ficaria verna subsp. verna in central Europe : evidence from morphology, ecology and life-history traits. Preslia, 91 : 179-212. ID PMB : 69008 DOI : 10.23855/preslia.2019.179 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69008
in Preslia > vol. 91 (Année 2019) . - pp. 179-212[article]Exemplaires
Cote Localisation Disponibilité aucun exemplaire Taxonomy of Rubus ser. Discolores in the Czech Republic and adjacent regions / Bohumil Travnicek in Preslia, vol. 77, n°1 (Année 2005)
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Titre : Taxonomy of Rubus ser. Discolores in the Czech Republic and adjacent regions Type de document : Livre Auteurs : Bohumil Travnicek (TrávnÃček, Bohumil), Auteur ; J. Zazvorka, Auteur Année de publication : 2005 Article en page(s) : pp. 1-88 Langues : Anglais Catégories : [Thèmes] Taxonomie Mots-clés : apogamie central Europe Czech Republic chorologie Rosaceae Rubus ser. Radula Résumé : "The current state of the taxonomy of Rubus ser. Discolores in Czech Republic is summarized. Since 1995, when the group was studied in the Flora of the Czech Republic, 6 new species have been recognized, some of which are also known from adjacent areas. They are described in the present study: R. austroslovacus, R. flos-amygdalae, R. guttiferus, R. parthenocissus, R. pericrispatus and R. portae-moravicae. The first 5 belong to the group of triploid species close to R. montanus and R. grabowskii, whilst R. portae-moravicae is related to R. praecox. Two additional species, originally recognized under provisional names, were identical to species described earlier: R. perperus and R. phyllostachys; the latter is also found in Slovakia. At present, 17 indigenous species, one naturalized alien (R. armeniacus) and one rare garden escape (R. ulmifolius [R. inermis]) of the ser. Discolores are known to occur in the Czech Republic. Distribution data and a key for the identification of all the species are presented. " Type de publication : périodique Référence biblio : Travnicek B., Zazvorka J., 2005 - Taxonomy of Rubus ser. Discolores in the Czech Republic and adjacent regions. Preslia, 77 (1) : 1-88. En ligne : http://www.preslia.cz/doi/preslia.2018.387.html Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67746
in Preslia > vol. 77, n°1 (Année 2005) . - pp. 1-88[article]Exemplaires
Cote Localisation Disponibilité aucun exemplaire