Evolutionary switch and genetic convergence on rbcL following the evolution of C4 photosynthesis.
Détails
ID Serval
serval:BIB_026D5AF08773
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Evolutionary switch and genetic convergence on rbcL following the evolution of C4 photosynthesis.
Périodique
Molecular Biology and Evolution
ISSN
1537-1719 (Electronic)
ISSN-L
0737-4038
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
25
Numéro
11
Pages
2361-2368
Langue
anglais
Résumé
Rubisco is responsible for the fixation of CO2 into organic compounds through photosynthesis and thus has a great agronomic importance. It is well established that this enzyme suffers from a slow catalysis, and its low specificity results into photorespiration, which is considered as an energy waste for the plant. However, natural variations exist, and some Rubisco lineages, such as in C4 plants, exhibit higher catalytic efficiencies coupled to lower specificities. These C4 kinetics could have evolved as an adaptation to the higher CO2 concentration present in C4 photosynthetic cells. In this study, using phylogenetic analyses on a large data set of C3 and C4 monocots, we showed that the rbcL gene, which encodes the large subunit of Rubisco, evolved under positive selection in independent C4 lineages. This confirms that selective pressures on Rubisco have been switched in C4 plants by the high CO2 environment prevailing in their photosynthetic cells. Eight rbcL codons evolving under positive selection in C4 clades were involved in parallel changes among the 23 independent monocot C4 lineages included in this study. These amino acids are potentially responsible for the C4 kinetics, and their identification opens new roads for human-directed Rubisco engineering. The introgression of C4-like high-efficiency Rubisco would strongly enhance C3 crop yields in the future CO2-enriched atmosphere.
Mots-clé
Adaptation, Biological, Biotechnology, Carbon Dioxide/metabolism, Codon, Crops, Agricultural/enzymology, Crops, Agricultural/genetics, Cyperaceae/classification, Cyperaceae/enzymology, Evolution, Molecular, Photosynthesis/genetics, Phylogeny, Plant Proteins/genetics, Poaceae/classification, Poaceae/enzymology, Ribulose-Bisphosphate Carboxylase/genetics, Selection, Genetic
Pubmed
Web of science
Open Access
Oui
Création de la notice
06/08/2008 23:39
Dernière modification de la notice
20/08/2019 13:24