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Different genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution / Detlev Drenckhahn in Forum Geobotanicum, vol. 7 (Année 2017)  

Public [article]  inForum Geobotanicum > vol. 7 (Année 2017) . - pp. 27-33 Titre : Different genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution Type de document : texte imprimé Auteurs : Detlev Drenckhahn, Auteur ; Werner Baumgartner, Auteur ; Ben J. M. Zonneveld, Auteur Année de publication : 2017 Article en page(s) : pp. 27-33 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Ficaria calthifolia [Espèces (in biblio)] Ficaria verna Mots-clés : génome  cytométrie  évolution Résumé : "The genus Ficaria is now considered to comprize eight Eurasian species. The most widespread European species is the tetraploid F. verna Huds. The present study provides evidence for the existence of two main lineages of F. verna that differ considerably in their genome size by about 3 pg. A Western F. verna lineage west of river Rhine displays a mean genome size (2C-value) of 34.2 pg and is almost precisely codistributed with the diploid F. ambigua Boreau (20 pg) north of the Mediterranean. The remaining part of Europe appears to be occupied by the Eastern F. verna lineage solely (mean genome size of 31.3 pg) which codistributes in South-Eastern Europe with the diploid F. calthifolia Rchb. (15 pg). There is little overlap at the boundary of Western and Eastern F. verna lineages with the occurrence of a separate intermediate group in the Netherlands (mean genome size of 33.2 pg) that appears to result from hybridization of both lineages. On the basis of these observations and further considerations we propose development of F. ambigua and F. calthifolia south of the Alps with subsequent divergence to populate their current Western and Eastern European ranges, respectively. The Western F. verna lineage is proposed to originate from autotetraploidization of F. ambigua (precursor) with moderate genome downsizing and the Eastern F. verna lineage from auto¬tetraploidization of F. calthifolia (precursor)." (source : auteurs) Type de publication : périodique Référence biblio : Drenckhahn D., Baumgartner W., Zonneveld B.-M., 2017 - Different genome sizes of Western and Eastern Ficaria verna lineages shed light on steps of Ficaria evolution. Forum Geobotanicum, 7 : 27-33. ID PMB : 69006 DOI : 10.3264/FG.2017.1122 En ligne : http://www.forum-geobotanicum.net/articles/vol_7-2016/drenckhahn-baumgartner-zon [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69006 [article]

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A morphometric study and revision of the Asplenium trichomanes group in the Czech Republic / Libor Ekrt in Preslia, vol. 80, n°3 (Année 2008)  

Public [article]  inPreslia > vol. 80, n°3 (Année 2008) . - pp. 325-347 Titre : A morphometric study and revision of the Asplenium trichomanes group in the Czech Republic Type de document : texte imprimé Auteurs : Libor Ekrt, Auteur ; Milan Stech, Auteur Année de publication : 2008 Article en page(s) : pp. 325-347 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Asplenium trichomanes [Espèces (in biblio)] Asplenium trichomanes L. subsp. hastatum (H.Christ) S.Jess. [Espèces (in biblio)] Asplenium trichomanes L. subsp. pachyrachis (H.Christ) Lovis & Reichst. [Espèces (in biblio)] Asplenium trichomanes L. subsp. quadrivalens D.E.Mey. [Espèces (in biblio)] Asplenium trichomanes L. subsp. trichomanes [ZG] Europe centrale [Thèmes] Fougères [Thèmes] Taxonomie Mots-clés : cytotype  cytométrie  morphométrie  clé de détermination Résumé : "A detailed cytogeographic and morphometric study of the Asplenium trichomanes group in the Czech Republic is presented. We detected diploid (2n = 72), tetraploid (2n = 144) and hybrid triploid plants (2n = 108). Based on the morphometric study, four intraspecific taxa are recognized. These taxa correspond to the four subspecies of A. trichomanes (A. t. subsp, trichomanes, A. t. subsp, quadrivalens, A. t. subsp, pachyrachis and A. t. subsp, hastatum) distinguished in the floras of western, southern and northern Europe. Triploid plants were determined as A. t. nothosubsp. lusaticum (A. t. subsp, trichomanes × A. t. subsp, quadrivalens). The individual morphological characters used for determining subspecies are evaluated and a determination key presented." (source : auteurs) Type de publication : périodique Référence biblio : Ekrt L., Stech M., 2008 - A morphometric study and revision of the Asplenium trichomanes group in the Czech Republic. Preslia, 80 (3) : 325-347. ID PMB : 69850 En ligne : https://botanika.prf.jcu.cz/systematics/publikace/2008_Ekrt_Stech_Preslia_AspTri [...] Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69850 [article]

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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)

Public [article]  inPreslia > vol. 91 (Année 2019) . - pp. 179-212 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 : texte imprimé 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 (eng) 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 [article]

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Stellaria ruderalis, a new species in the Stellaria mediagroup from central Europe / Martin Lepsí in Preslia, vol. 91 (Année 2019)  

Public [article]  inPreslia > vol. 91 (Année 2019) . - pp. 391-420 Titre : Stellaria ruderalis, a new species in the Stellaria mediagroup from central Europe Type de document : texte imprimé Auteurs : Martin Lepsí (Lepší, Martin), Auteur ; Petr Lepsí (Lepší, Petr), Auteur ; Petr Koutecky, Auteur ; Magdalena Lucanová (Lu%u010Danová, Magdalena), Auteur ; Eva Koutecká, Auteur ; Zdenek Kaplan, Auteur Année de publication : 2019 Article en page(s) : pp. 391-420 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Stellaria [ZG] Europe centrale [Thèmes] Taxonomie Mots-clés : Stellaria ruderalis  cytométrie  Internal transcribed spacer (ITS)  caryologie  morphométrie multivariée Résumé : "A new allotetraploid species in the Stellaria media group, S. ruderalis M. Lepší, P. Lepší, Z. Kaplan & P. Koutecký, which is possibly of hybridogenous origin between S. pallida and S. neglecta, is distinguished and described based on a biosystematic revision of the S. media group. A suite of biosystematic techniques, including molecular (internal transcribed spacer sequencing), karyological (chromosome counting, flow cytometry), multivariate morphometrics and phenological observations, was used to assess the variation in this species group and determine the taxonomic status of the species. All the methods employed produced similar results and supported the delimitation of four species within the Stellaria media group in central Europe: Stellaria ruderalis (2n = 4x = 44), S. pallida (2n = 2x = 22), S. neglecta (2n = 2x = 22) and S. media s. str. (2n = 4x = 40). Stellaria ruderalis is a winter annual growing mainly in disturbed ruderal open or semi-open communities. This species’ broad ecological amplitude allows it to commonly co-occur with its three related species. It is probably a widespread species in southern and central Europe. It is currently spreading in the northern part of central Europe. Photographs of the type specimen and individuals of the new species in situ are presented. Scanning electron micrographs of seeds, microphotographs of seeds and mitotic chromosome spreads and a key for the identification of all four species are provided." (source : auteurs) Type de publication : périodique Référence biblio : Lepsí M., Lepsí P., Koutecky P., Lucanová M., Koutecká E., Kaplan Z., 2019 - Stellaria ruderalis, a new species in the Stellaria mediagroup from central Europe. Preslia, 91 : 391-420. ID PMB : 69010 DOI : 10.23855/preslia.2019.391 En ligne : http://www.preslia.cz/doi/preslia.2019.391.html Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69010 [article]

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