Preslia . 82Paru le : 01/01/2010 |
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Ajouter le résultat dans votre panierNaturalized plants have smaller genomes than their non-invading relatives: a flow cytometric analysis of the Czech alien flora / M Kubešová in Preslia, 82 (2010)
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Titre : Naturalized plants have smaller genomes than their non-invading relatives: a flow cytometric analysis of the Czech alien flora Type de document : Électronique Auteurs : M Kubešová ; Lenka Moravcová ; J Suda ; Vojtěch Jarošík (1958-2013) ; Petr Pyšek Année de publication : 2010 Article en page(s) : 81-96 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Plantes subspontanées, naturalisées, envahissantes Résumé : Genome size has been suggested as one of the traits associated with invasiveness of plant species. To provide a quantitative insight into the role of this trait, we estimated nuclear DNA content in 93 alien species naturalized in the Czech Republic, belonging to 32 families, by using flow cytometry, and compared it with the values reported for non-invading congeneric and confamilial species from the Plant DNA C-values database. Species naturalized in the Czech Republic have significantly smaller genomes than their congeners not known to be naturalized or invasive in any part of the world. This trend is supported at the family level: alien species naturalized in the Czech flora have on average a smaller genome than is the mean value for non-invading confamilials. Moreover, naturalized and non-invading species clearly differed in the frequency of five genome size categories; this difference was mainly due to very small genomes prevailing and intermediate to very large genomes under-represented in the former group. Our results provide the first quantitative support for association of genome size with invasiveness, based on a large set of alien species across a number of plant families. However, there was no difference in the genome size of invasive species compared to naturalized but non-invasive. This suggests that small genome size provides alien plants with an advantage already at the stage of naturalization and need not be necessarily associated with the final stage of the process, i.e. invasion. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142462
in Preslia > 82 (2010) . - 81-96Kubešová, M., Moravcová, L., Suda, J., Jarošík, V., Pyšek, P. 2010. Naturalized plants have smaller genomes than their non-invading relatives: a flow cytometric analysis of the Czech alien flora. Preslia, 82: 81-96.Documents numériques
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Article (2010)Adobe Acrobat PDF Plant species of the Central European flora as aliens in Australia / Megan L. Phillips in Preslia, 82 (2010)
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Titre : Plant species of the Central European flora as aliens in Australia Type de document : Électronique Auteurs : Megan L. Phillips ; Brad R. Murray ; Petr Pyšek ; Jan Pergl (1977-) ; Vojtěch Jarošík (1958-2013) ; Milan Chytrý (1967-) ; Ingolf Kühn Année de publication : 2010 Article en page(s) : 465-482 Langues : Anglais (eng) Catégories : [CBNPMP-Géographique] Australie
[CBNPMP-Thèmes] Plantes subspontanées, naturalisées, envahissantesRésumé : The Central European flora is an important source pool of plant species introduced to many regions throughout the world. In this study, we identified a total of 759 plant species of the Central European flora that are currently recognized as alien species in Australia. We explored temporal patterns of introduction of these species to Australia in relation to method of introduction, growth form, naturalization status and taxonomy. Across all species, substantially larger numbers of species were introduced between 1840 and 1880 as well as between 1980 and the present, with a small peak of introductions within the 1930s. These patterns reflect early immigration patterns to Australia, recent improvements in fast and efficient transportation around the globe, and emigration away from difficult conditions brought about by the lead up to the Second World War respectively. We found that the majority of species had deliberate (69%) rather than accidental (31%) introductions and most species have not naturalized (66% casual species, 34% naturalized species). A total of 86 plant families comprising 31 tree species, 91 shrub species, 533 herbaceous species and 61 grass species present in Central Europe have been introduced to Australia. Differential patterns of temporal introduction of species were found as a function of both plant family and growth form and these patterns appear linked to variation in human migration numbers to Australia. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142473
in Preslia > 82 (2010) . - 465-482Phillips, ML., Murray, BR., Pyšek, P., Pergl, J., Jarošík, V., Chytrý, M., Kühn, I. 2010. Plant species of the Central European flora as aliens in Australia. Preslia, 82: 465-482.Documents numériques
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Article (2010)URL Genome size as a marker for identifying the invasive alien taxa in Fallopia section Reynoutria / Jan Suda in Preslia, 82 (2010)
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Titre : Genome size as a marker for identifying the invasive alien taxa in Fallopia section Reynoutria Type de document : Électronique Auteurs : Jan Suda ; Pavel Travnicek ; Brohumil Mandak ; Katterina Berchova-Bimova Année de publication : 2010 Article en page(s) : 97-106 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Fallopia Résumé : DAPI and propidium iodide flow cytometry were used to determine the variation in genome size in 166 samples and of all taxa and ploidy levels of Fallopia section Reynoutria (knotweeds) recorded in the Czech Republic. Significant differences were detected in the amount of nuclear DNA, associated with the ploidy levels and taxonomic identity of the material. At each ploidy level, F. sachalinensis showed the lowest and F. japonica the highest fluorescence intensities. The fluorescence values for the hybridogenous F. ×bohemica were located in-between these two levels. In most cases, there was at least a four-percent gap in fluorescence values between the nearest neighbours belonging to a different taxon. Intraspecific variation in genome size was very low in all taxa except hexaploid F. ×bohemica; this could be due to the complex evolutionary history of this taxon. Our results indicate that the amount of nuclear DNA can be used as a reliable marker for the identification of homoploid knotweed species and their hybrids. Different evolutionary pathways for the origin of high polyploids and/or hybridogenous taxa are proposed based on genome size. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142558
in Preslia > 82 (2010) . - 97-106Suda, J., Travnicek, P., Mandak, B., Berchova-Bimova, K. 2010. Genome size as a marker for identifying the invasive alien taxa in Fallopia section Reynoutria. Preslia, 82: 97-106.Documents numériques
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Article (2010)Adobe Acrobat PDF