Genetic Variability and Founder Effect in the Pitcher plant Sarracenia purpurea L. (Sarraceniaceae) in Introduced Populations of Switzerland: from Inbreeding to Invasion

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ID Serval
serval:BIB_6838FD8F787A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Genetic Variability and Founder Effect in the Pitcher plant Sarracenia purpurea L. (Sarraceniaceae) in Introduced Populations of Switzerland: from Inbreeding to Invasion
Périodique
Annals of Botany
Auteur(s)
Parisod  C., Trippi  C., Galland  N.
Statut éditorial
Publié
Date de publication
01/2005
Volume
95
Numéro
2
Pages
277-286
Notes
Old month value: jan
Résumé
Background and Aims The long-lived and mainly outcrossing species Sarracenia purpurea L. 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 an highly invasive plant.
Methods A population genetic survey by Random Amplified Polymorphism DNA markers (RAPD) together with historical insights and field pollination experiment.
Key Results At the regional scale, S. purpurea shows low structure (qst = 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 (qst = 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 This suggests 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.
Création de la notice
19/11/2007 11:31
Dernière modification de la notice
20/08/2019 15:23
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