Origin and expansion of the allotetraploid Aegilops geniculata, a wild relative of wheat.

Détails

ID Serval
serval:BIB_AFC229AC4B8B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Origin and expansion of the allotetraploid Aegilops geniculata, a wild relative of wheat.
Périodique
New Phytologist
Auteur(s)
Arrigo N., Felber F., Parisod C., Buerki S., Alvarez N., David J., Guadagnuolo R.
ISSN
1469-8137 (Electronic)
ISSN-L
0028-646X
Statut éditorial
Publié
Date de publication
2010
Peer-reviewed
Oui
Volume
187
Numéro
4
Pages
1170-1180
Langue
anglais
Résumé
*This study reconstructs the phylogeography of Aegilops geniculata, an allotetraploid relative of wheat, to discuss the impact of past climate changes and recent human activities (e.g. the early expansion of agriculture) on the genetic diversity of ruderal plant species. *We combined chloroplast DNA (cpDNA) sequencing, analysed using statistical parsimony network, with nonhierarchical K-means clustering of amplified fragment length polymorphism (AFLP) genotyping, to unravel patterns of genetic structure across the native range of Ae. geniculata. The AFLP dataset was further explored by measurement of the regional genetic diversity and the detection of isolation by distance patterns. *Both cpDNA and AFLP suggest an eastern Mediterranean origin of Ae. geniculata. Two lineages have spread independently over northern and southern Mediterranean areas. Northern populations show low genetic diversity but strong phylogeographical structure among the main peninsulas, indicating a major influence of glacial cycles. By contrast, low genetic structuring and a high genetic diversity are detected in southern Mediterranean populations. Finally, we highlight human-mediated dispersal resulting in substantial introgression between resident and migrant populations. *We have shown that the evolutionary trajectories of ruderal plants can be similar to those of wild species, but are interfered by human activities, promoting range expansions through increased long-distance dispersal and the creation of suitable habitats.
Mots-clé
Biological Evolution, Climate Change, DNA, Chloroplast, Ecology, Ecosystem, Genetic Variation, Genotype, Humans, Mediterranean Sea, Phylogeny, Phylogeography, Poaceae/genetics, Seed Dispersal, Tetraploidy, Triticum/genetics
Pubmed
Web of science
Création de la notice
09/06/2010 15:01
Dernière modification de la notice
03/03/2018 20:33
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