Repeated unidirectional introgression towards Populus balsamifera in contact zones of exotic and native poplars.

Détails

ID Serval
serval:BIB_11066A42A531
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Repeated unidirectional introgression towards Populus balsamifera in contact zones of exotic and native poplars.
Périodique
Molecular ecology
Auteur⸱e⸱s
Thompson S.L., Lamothe M., Meirmans P.G., Périnet P., Isabel N.
ISSN
1365-294X[electronic]
Statut éditorial
Publié
Date de publication
2010
Peer-reviewed
Oui
Volume
19
Numéro
1
Pages
132-145
Langue
anglais
Résumé
As the evolutionary significance of hybridization is largely dictated by its extent beyond the first generation, we broadly surveyed patterns of introgression across a sympatric zone of two native poplars (Populus balsamifera, Populus deltoides) in Quebec, Canada within which European exotic Populus nigra and its hybrids have been extensively planted since the 1800s. Single nucleotide polymorphisms (SNPs) that appeared fixed within each species were characterized by DNA-sequencing pools of pure individuals. Thirty-five of these diagnostic SNPs were employed in a high-throughput assay that genotyped 635 trees of different age classes, sampled from 15 sites with various degrees of anthropogenic disturbance. The degree of admixture within sampled trees was then assessed through Bayesian clustering of genotypes. Hybrids were present in seven of the populations, with 2.4% of all sampled trees showing spontaneous admixture. Sites with hybrids were significantly more disturbed than pure stands, while hybrids comprised both immature juveniles and trees of reproductive age. All three possible F1s were detected. Advanced-generation hybrids were consistently biased towards P. balsamifera regardless of whether hybridization had occurred with P. deltoides or P. nigra. Gene exchange between P. deltoides and P. nigra was not detected beyond the F1 generation; however, detection of a trihybrid demonstrates that even this apparent reproductive isolation does not necessarily result in an evolutionary dead end. Collectively, results demonstrate the natural fertility of hybrid poplars and suggest that introduced genes could potentially affect the genetic integrity of native trees, similar to that arising from introgression between natives.
Mots-clé
Canada, Cluster Analysis, DNA, Chloroplast/genetics, DNA, Plant/genetics, Genetic Markers, Genetics, Population, Haplotypes, Hybridization, Genetic, Polymorphism, Single Nucleotide, Populus/genetics, Sequence Analysis, DNA
Pubmed
Web of science
Création de la notice
08/02/2010 10:34
Dernière modification de la notice
20/08/2019 12:38
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