Oligocene CO2 decline promoted C4 photosynthesis in grasses.

Détails

ID Serval
serval:BIB_05E5E51B6F29
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Oligocene CO2 decline promoted C4 photosynthesis in grasses.
Périodique
Current Biology
Auteur(s)
Christin P.A., Besnard G., Samaritani E., Duvall M.R., Hodkinson T.R., Savolainen V., Salamin N.
ISSN
0960-9822 (Print)
ISSN-L
0960-9822
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
18
Numéro
1
Pages
37-43
Langue
anglais
Résumé
C4 photosynthesis is an adaptation derived from the more common C3 photosynthetic pathway that confers a higher productivity under warm temperature and low atmospheric CO2 concentration [1, 2]. C4 evolution has been seen as a consequence of past atmospheric CO2 decline, such as the abrupt CO2 fall 32-25 million years ago (Mya) [3-6]. This relationship has never been tested rigorously, mainly because of a lack of accurate estimates of divergence times for the different C4 lineages [3]. In this study, we inferred a large phylogenetic tree for the grass family and estimated, through Bayesian molecular dating, the ages of the 17 to 18 independent grass C4 lineages. The first transition from C3 to C4 photosynthesis occurred in the Chloridoideae subfamily, 32.0-25.0 Mya. The link between CO2 decrease and transition to C4 photosynthesis was tested by a novel maximum likelihood approach. We showed that the model incorporating the atmospheric CO2 levels was significantly better than the null model, supporting the importance of CO2 decline on C4 photosynthesis evolvability. This finding is relevant for understanding the origin of C4 photosynthesis in grasses, which is one of the most successful ecological and evolutionary innovations in plant history.
Mots-clé
Bayes Theorem, Carbon/metabolism, Carbon Dioxide/analysis, Likelihood Functions, Molecular Sequence Data, Photosynthesis, Phylogeny, Poaceae/classification, Poaceae/metabolism
Pubmed
Web of science
Création de la notice
20/01/2008 16:17
Dernière modification de la notice
03/03/2018 13:25
Données d'usage