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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)
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-Thématique] 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, Lenka, Suda, J, Jarošík, Vojtěch (1958-2013), Pyšek, Petr 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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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-Thématique] 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, Megan L., Murray, Brad R., Pyšek, Petr, Pergl, Jan (1977-), Jarošík, Vojtěch (1958-2013), Chytrý, Milan (1967-), Kühn, Ingolf 2010 Plant species of the Central European flora as aliens in Australia. Preslia, 82: 465-482.Documents numériques
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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-Thématique] 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, Jan, Travnicek, Pavel, Mandak, Brohumil, Berchova-Bimova, Katterina 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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Titre : Reproductive characteristics of neophytes in the Czech Republic: traits of invasive and non-invasive species Type de document : Électronique Auteurs : Lenka Moracova ; Petr Pyšek ; Vojtěch Jarošík (1958-2013) ; Vendula Havlíčková ; Petr Zákravský Année de publication : 2010 Article en page(s) : 365-390 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Plantes subspontanées, naturalisées, envahissantes
[CBNPMP-Géographique] Europe centraleRésumé : This paper describes the reproductive characteristics of 93 neophytes (alien species introduced after 1500 A.D.) of the flora of the Czech Republic and compares trait values between naturalized invasive and naturalized non-invasive neophytes. Species were sampled and seed collected in the field from multiple localities in the Czech Republic. Traits related to seed production (propagule number per plant and per population), dispersal (propagule size, length/width ratio and weight; buoyancy; epizoochory; terminal velocity) and establishment (germination; seedling relative growth rate; seedling establishment) were measured for each species either in the field, in a common garden experiment or in the laboratory. Invasive species significantly differ from naturalized non-invasive species in propagule length/width ratio (by having lower ratio, i.e. more rounded propagules) and fecundity (invasive species are more fecund, both per individual plant and in terms of the population propagule production). Invasive species have proportionally fewer seedlings establishing in the autumn and better capacity for dispersal by wind than non-invasive species. The results for several traits differ depending on whether or not the effect of phylogeny is included in analytical models.
Considering species relatedness expressed as a taxonomic hierarchy, invasive species have lighter propagules and higher population propagule numbers, and marginally significantly differ in producing more propagules per plant and having higher capacity for dispersal bywater.We found that most variation in invasiveness is linked to variation among species within genera. This distribution of relatedness means that predictions of whether a species will become invasive cannot be based on traits of the relatives of the given species at higher taxonomic levels. The distinction made in this paper, i.e. invasive species vs. naturalized but non-invasive species, can potentially contribute to a deeper understanding of the role of traits associated with invasiveness because the crucial transition from the naturalized to invasion stage is rarely addressed in invasion ecology.Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=153336
in Preslia > 82 (2010) . - 365-390Moracova, Lenka, Pyšek, Petr, Jarošík, Vojtěch (1958-2013), Havlíčková, Vendula, Zákravský, Petr 2010 Reproductive characteristics of neophytes in the Czech Republic: traits of invasive and non-invasive species. Preslia, 82: 365-390.Documents numériques
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