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Genetic Variability and Founder Effect in the Pitcher Plant Sarracenia purpurea (Sarraceniaceae) in Populations Introduced into Switzerland : from Inbreeding to Invasion / Christian Parisod in Annals of Botany, 95 (2005)
[article]
Titre : Genetic Variability and Founder Effect in the Pitcher Plant Sarracenia purpurea (Sarraceniaceae) in Populations Introduced into Switzerland : from Inbreeding to Invasion Type de document : Électronique Auteurs : Christian Parisod ; Charlotte Trippi ; Nicole Galland Année de publication : 2005 Article en page(s) : 277-286 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Plantes subspontanées, naturalisées, envahissantes
[CBNPMP-Géographique] SuisseMots-clés : Sarracenia purpurea L., 1753 Résumé : Background and aims: The long-lived and mainly outcrossing species Sarracenia purpurea has been introduced into Switzerland and become invasive. This creates the opportunity to study reactions to founder effect and how a species can circumvent deleterious effects of bottlenecks such as reduced genetic diversity, inbreeding and extinction through mutational meltdown, to emerge as a highly invasive plant. Methods: A population genetic survey by random amplified polymorphism DNA markers (RAPD) together with historical insights and a field pollination experiment were carried out. Key results: At the regional scale, S. purpurea shows low structure (thetast=0.072) due to a recent founder event and important subsequent growth. Nevertheless, multivariate statistical analyses reveal that, because of a bottleneck that shifted allele frequencies, most of the variability is independent among populations. In one population (Tenasses) the species has become invasive and genetic analysis reveals restricted gene flow and family structure (thetast=0.287). Although inbreeding appears to be high (Fis >0.410 from a Bayesian estimation), a field pollination experiment failed to detect significant inbreeding depression upon F1 seed number and seed weight fitness-traits. Furthermore, crosses between unrelated individuals produced F1 seeds with significantly reduced fitness, thus showing local outbreeding depression. Conclusions: The results suggest that, under restricted gene flow among families, the species may not only have rapidly purged deleterious alleles, but also have undergone some form of selection for inbreeding due to co-adaptation between loci.
Lien pérenne : DOI : 10.1093/aob/mci023 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142815
in Annals of Botany > 95 (2005) . - 277-286Parisod, C., Trippi, C., Galland, N. 2005. Genetic Variability and Founder Effect in the Pitcher Plant Sarracenia purpurea (Sarraceniaceae) in Populations Introduced into Switzerland : from Inbreeding to Invasion. Annals of Botany, 95: 277-286.Documents numériques
Consultable
Article (2005)URL Limits to reproductive success of Sarracenia purpurea (Sarracenia ceae) / Gidi Ne'eman in American Journal of Botany, 93 (11) (2006)
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Titre : Limits to reproductive success of Sarracenia purpurea (Sarracenia ceae) Type de document : Électronique Auteurs : Gidi Ne'eman ; Rina Ne'eman ; Aaron M Ellison Année de publication : 2006 Article en page(s) : 1660-1666 Langues : Anglais (eng) Catégories : [CBNPMP-Thèmes] Plantes subspontanées, naturalisées, envahissantes Mots-clés : Sarracenia purpurea L., 1753 Résumé : Plant biologists have an enduring interest in assessing components of plant fitness and determining limits to seed set. Consequently, the relative contributions of resource and pollinator availability have been documented for a large number of plant species. We experimentally examined the roles of resource and pollen availability on seed set by the northern pitcher plant Sarracenia purpurea. We were able to distinguish the relative contributions of carbon (photosynthate) and mineral nutrients (nitrogen) to reproductive success. We also determined potential pollinators of this species. The bees Bombus affinis and Augochlorella aurata and the fly Fletcherimyia fletcheri were the only floral visitors to S. purpurea that collected pollen. Supplemental pollination increased seed set by <10%, a much lower percentage than would be expected, given data from noncarnivorous, animal-pollinated taxa. Seed set was reduced by 14% in plants that could not capture prey and by another 23% in plants whose pitcher-shaped leaves were also prevented from photosynthesizing. We conclude that resources are more important than pollen availability in determining seed set by this pitcher plant and that reproductive output may be another "cost" of the carnivorous habit. Lien pérenne : DOI : 10.3732/ajb.93.11.1660 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=142822
in American Journal of Botany > 93 (11) (2006) . - 1660-1666Ne'eman, G., Ne'eman, R., Ellison, A.M. 2006. Limits to reproductive success of Sarracenia purpurea (Sarracenia ceae). American Journal of Botany, 93(11): 1660-1666.Documents numériques
Consultable
Article (2006)URL