[article] | 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 (Trávníček, 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] Taxonomie
| | Mots-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
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Affiner la rechercheDifferent genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution in Forum Geobotanicum, vol. 7 (Année 2017)
