C4 Photosynthesis evolved in grasses via parallel adaptive genetic changes.

Détails

ID Serval
serval:BIB_F49509608278
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
C4 Photosynthesis evolved in grasses via parallel adaptive genetic changes.
Périodique
Current Biology
Auteur(s)
Christin P.A., Salamin N., Savolainen V., Duvall M.R., Besnard G.
ISSN
0960-9822 (Print)
ISSN-L
0960-9822
Statut éditorial
Publié
Date de publication
2007
Peer-reviewed
Oui
Volume
17
Numéro
14
Pages
1241-1247
Langue
anglais
Résumé
Phenotypic convergence is a widespread and well-recognized evolutionary phenomenon. However, the responsible molecular mechanisms remain often unknown mainly because the genes involved are not identified. A well-known example of physiological convergence is the C4 photosynthetic pathway, which evolved independently more than 45 times [1]. Here, we address the question of the molecular bases of the C4 convergent phenotypes in grasses (Poaceae) by reconstructing the evolutionary history of genes encoding a C4 key enzyme, the phosphoenolpyruvate carboxylase (PEPC). PEPC genes belong to a multigene family encoding distinct isoforms of which only one is involved in C4 photosynthesis [2]. By using phylogenetic analyses, we showed that grass C4 PEPCs appeared at least eight times independently from the same non-C4 PEPC. Twenty-one amino acids evolved under positive selection and converged to similar or identical amino acids in most of the grass C4 PEPC lineages. This is the first record of such a high level of molecular convergent evolution, illustrating the repeatability of evolution. These amino acids were responsible for a strong phylogenetic bias grouping all C4 PEPCs together. The C4-specific amino acids detected must be essential for C4 PEPC enzymatic characteristics, and their identification opens new avenues for the engineering of the C4 pathway in crops.
Mots-clé
Amino Acid Substitution, Evolution, Molecular, Genetic Engineering, Molecular Sequence Data, Phosphoenolpyruvate Carboxylase/genetics, Photosynthesis/genetics, Phylogeny, Poaceae/genetics, Selection, Genetic
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/01/2008 19:41
Dernière modification de la notice
20/08/2019 17:21
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