The chloroplast genome of the hexaploid Spartina maritima (Poaceae, Chloridoideae): Comparative analyses and molecular dating

Rousseau-Gueutin Mathieu, Bellot Sidonie, Martin Guillaume, Boutte Julien, Chelaifa Houda, Lima Oscar, Michon-Coudouel Sophie, Naquin Delphine, Salmon Armel, Ainouche K., Ainouche Malika Lily. 2015. The chloroplast genome of the hexaploid Spartina maritima (Poaceae, Chloridoideae): Comparative analyses and molecular dating. Molecular Phylogenetics and Evolution, 93 : 5-16.

https://doi.org/10.1016/j.ympev.2015.06.013

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Url - jeu de données - Entrepôt autre : http://www.ncbi.nlm.nih.gov/nuccore/KP176438

Quartile : Q2, Sujet : GENETICS & HEREDITY / Quartile : Q2, Sujet : EVOLUTIONARY BIOLOGY / Quartile : Q2, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY

Résumé : The history of many plant lineages is complicated by reticulate evolution with cases of hybridization often followed by genome duplication (allopolyploidy). In such a context, the inference of phylogenetic relationships and biogeographic scenarios based on molecular data is easier using haploid markers like chloroplast genome sequences. Hybridization and polyploidization occurred recurrently in the genus Spartina (Poaceae, Chloridoideae), as illustrated by the recent formation of the invasive allododecaploid S. anglica during the 19th century in Europe. Until now, only a few plastid markers were available to explore the history of this genus and their low variability limited the resolution of species relationships. We sequenced the complete chloroplast genome (plastome) of S. maritima, the native European parent of S. anglica, and compared it to the plastomes of other Poaceae. Our analysis revealed the presence of fast-evolving regions of potential taxonomic, phylogeographic and phylogenetic utility at various levels within the Poaceae family. Using secondary calibrations, we show that the tetraploid and hexaploid lineages of Spartina diverged 6–10 my ago, and that the two parents of the invasive allopolyploid S. anglica separated 2–4 my ago via long distance dispersal of the ancestor of S. maritima over the Atlantic Ocean. Finally, we discuss the meaning of divergence times between chloroplast genomes in the context of reticulate evolution.

Mots-clés Agrovoc : Spartina, génome, chloroplaste, polyploïdie, phylogénie, biogéographie, biologie moléculaire, évolution, histoire naturelle, séquence nucléotidique

Mots-clés complémentaires : Spartina maritima, Séquencage

Mots-clés libres : Spartina maritima, Chloridoideae, Chloroplast genome, Polyploidy, Molecular phylogeny, Molecular dating

Classification Agris : F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Hors axes (2014-2018)

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