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
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