Ecological hybrid speciation in central-European species of Bolboschoenus : genetic and morphological evaluation / Sona Pisova in Preslia, vol. 89 (Année 2017) 

Public [article]  inPreslia > vol. 89 (Année 2017) . - pp. 17-39 Titre : Ecological hybrid speciation in central-European species of Bolboschoenus : genetic and morphological evaluation Type de document : Livre Auteurs : Sona Pisova, Auteur ; Zdenka Hroudová, Auteur ; Zuzana Chumova, Auteur ; Tomas Fer, Auteur Année de publication : 2017 Article en page(s) : pp. 17-39 Langues : Anglais Catégories : [Espèces (in biblio)] Bolboschoenus [ZG] Europe centrale Mots-clés : spéciation  hybride  morphologie  génétique Résumé : "Divergent natural selection is known to facilitate speciation in many taxa. The genus Bolboschoenus (Cyperaceae) is a model group for investigating ecological and homoploid hybrid speciation. Four taxa of Bolboschoenus occur in central Europe: the halophyte B. maritimus and glycophytes B. laticarpus, B. planiculmis and B. yagara. These species differ in their ecological niches. Such ecological and/or geographical isolation is critical for homoploid hybrid speciation. The determination of species of Bolboschoenus is based on morphological characters of the inflorescence and on achene shape and anatomy. On the basis of its intermediate morphology, chromosome number and ecological amplitude B. laticarpus is thought to be a hybrid. In order to determine the validity of morphological species and the possible hybrid origin of B. laticarpus we used amplified fragment length polymorphisms (AFLPs) as molecular markers and compared different genetic groups defined using STRUCTURE analysis with morphological data. The morphological classification of central-European species of Bolboschoenus was confirmed. Plants of heterogeneous genotypes were also found to be intermediate individuals resulting from spontaneous hybridization. Hybrid origin of B. laticarpus, which is genetically and morphologically intermediate between B. yagara and B. planiculmis, was elucidated. Inflorescence characters were less important for determining species than anatomical characters of achenes (widths of the exocarp and mesocarp)." (source : auteurs) Type de publication : périodique Référence biblio : Pisova S., Hroudová Z., Chumova Z., Fer T., 2017 - Ecological hybrid speciation in central-European species of Bolboschoenus : genetic and morphological evaluation. Preslia, 89 : 17-39. ID PMB : 69472 DOI : 10.23855/PRESLIA.2017.017 En ligne : http://www.preslia.cz/P171Pisova.pdf Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69472 [article]

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Intraspecific differentiation of Sparganium erectum in the Czech Republic: molecular, genome size and morphometric analysis / Sona Pisova in Preslia, vol. 92 (Année 2020) 

Public [article]  inPreslia > vol. 92 (Année 2020) . - pp. 137-165 Titre : Intraspecific differentiation of Sparganium erectum in the Czech Republic: molecular, genome size and morphometric analysis Type de document : Livre Auteurs : Sona Pisova, Auteur ; Tomas Fer, Auteur Année de publication : 2020 Article en page(s) : pp. 137-165 Langues : Anglais Catégories : [ZG] République tchèque Use for events after 1992. [Espèces (in biblio)] Sparganium [Espèces (in biblio)] Sparganium erectum Mots-clés : génome  hybridation  Amplification Fragment Length Polymorphism (AFLP)  analyse multivariée Résumé : "Aquatic and wetland plants tend to be very phenotypically plastic, which accounts for the taxonomic difficulties in many groups. In the genus Sparganium, which comprises about 14 species, numerous taxa at different ranks are described. The classification of the genus is based on generative characters on the fruit, which are less influenced by the environment than vegetative characters. Nevertheless, the intraspecific division of Sparganium erectum poses problems, especially the existence of several intraspecific taxa along with intermediate individuals. In this study we examined four European subspecies of S. erectum (subsp. erectum, subsp. microcarpum, subsp. neglectum and subsp. oocarpum) from 64 populations in the Czech Republic. A combination of multivariate morphometrics, AFLPs and genome size estimation allowed us to confirm the current subspecies classification and investigate putative intraspecific hybridization. Four genetic groups with different genome sizes corresponding to the subspecies were found. Morphological characters that were described in previous studies correlated with these genetic groups and thus affirmed the classification. The most important characters for subspecies differentiation were width and length of fruit, style length, length of the upper part of the fruit and constriction in the middle part of the fruit. In addition, admixed individuals between the genetic groups were recorded. The hybrid origin of subsp. oocarpum was confirmed, being derived from the crossing of subsp. erectum and subsp. neglectum. Finally, three other hybrid combinations were detected, suggesting recent hybridization: subsp. erectum × subsp. microcarpum, subsp. microcarpum × subsp. neglectum, and subsp. erectum × subsp. oocarpum." (source : auteurs) Type de publication : périodique Référence biblio : Pisova S., Fer T., 2020 - Intraspecific differentiation of Sparganium erectum in the Czech Republic: molecular, genome size and morphometric analysis. Preslia, 92 : 137-165. ID PMB : 69773 DOI : 10.23855/preslia.2020.137 En ligne : http://www.preslia.cz/doi/preslia.2020.137.html Format de la ressource électronique : document Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=69773 [article]

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