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Cytogenetic, geographical, spore type and plastid haplotype data reveal cryptic patterns of species diversity in the cosmopolitan Cystopteris fragilis complex (Polypodiopsida: Cystopteridaceae) / Libor Ekrt in Botanical Journal of the Linnean Society, vol. 199, n°3 (Année 2022)

Public [article]  inBotanical Journal of the Linnean Society > vol. 199, n°3 (Année 2022) . - pp. 728-739 Titre : Cytogenetic, geographical, spore type and plastid haplotype data reveal cryptic patterns of species diversity in the cosmopolitan Cystopteris fragilis complex (Polypodiopsida: Cystopteridaceae) Type de document : texte imprimé Auteurs : Libor Ekrt, Auteur ; Jiri Kosnar, Auteur ; Carl J. Rothfels, Auteur ; Kristýna HanuÅ¡ová (Hanusova), Auteur ; Ondřej Hornych, Auteur ; Tomas Urfus, Auteur Année de publication : 2022 Article en page(s) : pp. 728-739 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Cystopteris dickieana [Espèces (in biblio)] Cystopteris fragilis [Thèmes] Ptéridophytes (fougère, prêle, lycopode, isoète, sélaginelle) [Thèmes] Taxonomie Mots-clés : cytogénétique, cytotaxonomie  hybridation  polyploïdie  Spore  ADN chloroplastique  phylogénétique Résumé : "The delimitation of lineages in the Cystopteris fragilis complex is complicated by the presence of multiple cytotypes and a lack of defining morphological characters. One character, the production of rugose instead of regular spiny spores, is sometimes associated with a potential Scottish endemic, C. dickieana; however, whether this character is associated with a distinct lineage is uncertain. To better understand the diversity in the C. fragilis complex, we selected 87 C. fragilis samples of known ploidy (4x, 5x, 6x) for sequencing of two plastid loci and we assessed their spore types. These samples represent the variability found in Northern Hemisphere populations, including the type locality of C. dickieana in Scotland. Our analyses revealed two haplotype lineages, which we label the hemifragilis and reevesiana clades, based on their potential relationship to the two presumed diploid parents of C. fragilis. Hexaploids and tetraploids were both polyphyletic. Rugose spores were rarer overall (26% of samples), but five times more prevalent in the hemifragilis clade. Although proper delimitation and understanding of C. fragilis remains a challenge, this study further describes great genotypic and cytotypic complexity present in this complex. Furthermore, rugose-spored plants are widely distributed and should not be associated with a single name." (source : auteurs) Type de publication : périodique Référence biblio : Ekrt L., Kosnar J., Rothfels C., HanuÅ¡ová K., Hornych O., Urfus T., 2022 - Cytogenetic, geographical, spore type and plastid haplotype data reveal cryptic patterns of species diversity in the cosmopolitan Cystopteris fragilis complex (Polypodiopsida: Cystopteridaceae). Biological Journal of the Linnean Society, 199 (3) : 728-739. ID PMB : 71474 DOI : 10.1093/botlinnean/boab078 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71474 [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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