Titre
Evolutionary insights on C4 photosynthetic subtypes in grasses from genomics and phylogenetics
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Christin, P.A.
Auteure/Auteur
Samaritani, E.
Auteure/Auteur
Petitpierre, B.
Auteure/Auteur
Salamin, N.
Auteure/Auteur
Besnard, G.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
1759-6653
Statut éditorial
Publié
Date de publication
2009
Volume
2009
Première page
221
Dernière page/numéro d’article
230
Peer-reviewed
Oui
Langue
anglais
Résumé
In plants, an oligogene family encodes NADP-malic enzymes (NADP-me), which are responsible for various functions and exhibit different kinetics and expression patterns. In particular, a chloroplast isoform of NADP-me plays a key role in one of the three biochemical subtypes of C4 photosynthesis, an adaptation to warm environments that evolved several times independently during angiosperm diversification. By combining genomic and phylogenetic approaches, this study aimed at identifying the molecular mechanisms linked to the recurrent evolutions of C4-specific NADP-me in grasses (Poaceae). Genes encoding NADP-me (nadpme) were retrieved from genomes of model grasses and isolated from a large sample of C3 and C4 grasses. Genomic and phylogenetic analyses showed that 1) the grass nadpme gene family is composed of four main lineages, one of which is expressed in plastids (nadpme-IV), 2) C4-specific NADP-me evolved at least five times independently from nadpme-IV, and 3) some codons driven by positive selection underwent parallel changes during the multiple C4 origins. The C4 NADP-me being expressed in chloroplasts probably constrained its recurrent evolutions from the only plastid nadpme lineage and this common starting point limited the number of evolutionary paths toward a C4 optimized enzyme, resulting in genetic convergence. In light of the history of nadpme genes, an evolutionary scenario of the C4 phenotype using NADP-me is discussed.
PID Serval
serval:BIB_D56AF8232BAB
Open Access
Oui
Date de création
2009-07-21T06:42:31.136Z
Date de création dans IRIS
2025-05-20T22:27:29Z
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Nom
BIB_D56AF8232BAB.P001.pdf
Version du manuscrit
preprint
Taille
532.41 KB
Format
Adobe PDF
PID Serval
serval:BIB_D56AF8232BAB.P001
URN
urn:nbn:ch:serval-BIB_D56AF8232BAB1
Somme de contrôle
(MD5):289092a20e9d66a133c0ff227384c373