trié(s) par (Pertinence décroissant(e), Titre croissant(e)) 

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]

Exemplaires(0)

Disponibilité
aucun exemplaire

---

1 (1 - 1 / 1) Par page : 25 50 100 200