Two independent C4 origins in Aristidoideae (Poaceae) revealed by the recruitment of distinct phosphoenolpyruvate carboxylase genes

Détails

ID Serval
serval:BIB_6697530E807F
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Two independent C4 origins in Aristidoideae (Poaceae) revealed by the recruitment of distinct phosphoenolpyruvate carboxylase genes
Périodique
American Journal of Botany
Auteur⸱e⸱s
Christin P.A., Besnard G.
ISSN
0002-9122
Statut éditorial
Publié
Date de publication
2009
Peer-reviewed
Oui
Volume
96
Numéro
12
Pages
2234-2239
Langue
anglais
Résumé
Determining the number of evolutions of an adaptive novelty is primordial to understand its evolutionary significance. C-4 photosynthesis, an adaptation to low CO2 atmospheric concentration and high temperature, evolved multiple times, but the number of convergent evolutions is still debated. In Poaceae phylogeny, numerous C-4 groups are separated by C-3 taxa, but whether these correspond to independent C-4 origins or a few C-4 evolutions followed by reversals is controversial. The Aristidoideae subfamily is formed by two C-4 genera, Aristida and Stipagrostis, separated by the C-3 genus Sartidia. In the current study, we investigated the evolutionary history of genes encoding phosphoenolpyruvate carboxylases (PEPC) to shed light on the photosynthetic transitions that occurred in Aristidoideae. We identified six distinct PEPC gene lineages that appeared through several rounds of gene duplications before or early during grass diversification. The gene lineage encoding the C-4 PEPC of Stipagrostis differs from those of the other C-4 grasses, including Aristida. These distinct origins of C-4 PEPC genes from these two Aristidoideae genera unequivocally indicate that they integrated the C-4 pathway independently. This highlights the importance of candidate-gene studies when inferring the evolutionary history of a character such as C-4 photosynthesis, one of the greatest evolutionary successes in plant history.
Mots-clé
Aristida, Aristidoideae, C-4 photosynthesis, character mapping, grasses, molecular evolution, multiple origins, phylogeny, Poaceae, Stipagrostis
Web of science
Open Access
Oui
Création de la notice
04/09/2009 8:40
Dernière modification de la notice
21/08/2019 6:11
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