A total evidence approach to understanding phylogenetic relationships and ecological diversity in Selaginella subg. Tetragonostachys.

Détails

ID Serval
serval:BIB_9D848B13EAC6
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A total evidence approach to understanding phylogenetic relationships and ecological diversity in Selaginella subg. Tetragonostachys.
Périodique
American Journal of Botany
Auteur(s)
Arrigo N., Therrien J., Anderson C.L., Windham M.D., Haufler C.H., Barker M.S.
ISSN
1537-2197 (Electronic)
ISSN-L
0002-9122
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
100
Numéro
8
Pages
1672-1682
Langue
anglais
Résumé
PREMISE OF THE STUDY: Several members of Selaginella are renowned for their ability to survive extreme drought and "resurrect" when conditions improve. Many of these belong to subgenus Tetragonostachys, a group of ∼45 species primarily found in North and Central America, with substantial diversity in the Sonoran and Chihuahuan Deserts. We evaluated the monophyly and the age of subgenus Tetragonostachys and assess how drought tolerance contributed to the evolution of this clade.
METHODS: Our study included most Tetragonostachys species, using plastid and nuclear sequences, fossil and herbarium records, and climate variables to describe the species diversity, phylogenetic relationships, divergence times, and climatic niche evolution in the subgenus.
KEY RESULTS: We found that subgenus Tetragonostachys forms a monophyletic group sister to Selaginella lepidophylla and may have diverged from other Selaginella because of a Gondwanan-Laurasian vicariance event ca. 240 mya. The North American radiation of Tetragonostachys appears to be much more recent and to have occurred during the Early Cretaceous-late Paleocene interval. We identified two significant and nested ecological niche shifts during the evolution of Tetragonostachys associated with extreme drought tolerance and a more recent shift to cold climates. Our analyses suggest that drought tolerance evolved in the warm deserts of southwest North America and may have been advantageous for colonization of cold and dry boreal climates.
CONCLUSIONS: Our investigation provides a foundation for future research addressing the genomics of ecological niche evolution and the potential role of reticulate evolution in Selaginella subgenus Tetragonostachys.
Mots-clé
Base Sequence, Biological Evolution, Climate, DNA, Plant/chemistry, DNA, Plant/genetics, DNA, Ribosomal Spacer/chemistry, DNA, Ribosomal Spacer/genetics, Ecology, Fossils, Genetic Variation, Geography, Molecular Sequence Data, Phylogeny, RNA, Ribosomal/genetics, Selaginellaceae/genetics, Selaginellaceae/physiology, Sequence Analysis, DNA, Time Factors
Pubmed
Web of science
Création de la notice
15/05/2013 9:45
Dernière modification de la notice
20/08/2019 15:03
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