Oligocene CO2 decline promoted C4 photosynthesis in grasses

被引:278
作者
Christin, Pascal-Antoine [1 ]
Besnard, Guillaume [1 ]
Samaritani, Emanuela [1 ]
Duvall, Melvin R. [2 ]
Hodkinson, Trevor R. [3 ]
Savolainen, Vincent [4 ]
Salamin, Nicolas [1 ]
机构
[1] Univ Lausanne, Dept Ecol & Evolut Biophore, CH-1015 Lausanne, Switzerland
[2] No Illinois Univ, Dept Biol Sci, De Kalb, IL 60115 USA
[3] Univ Dublin Trinity Coll, Sch Nat Sci, Dept Bot, Dublin D2, Ireland
[4] Univ London Imperial Coll Sci Technol & Med, Ascot SL5 7PY, Berks, England
关键词
D O I
10.1016/j.cub.2007.11.058
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
C-4 photosynthesis is an adaptation derived from the more common C-3 photosynthetic pathway that confers a higher productivity under warm temperature and low atmospheric CO2 concentration [1, 2]. C-4 evolution has been seen as a consequence of past atmospheric CO2 decline, such as the abrupt CO2 fall 32-25 million years ago (Mya) [3-6]. This relationship has never been tested rigorously, mainly because of a lack of accurate estimates of divergence times for the different C-4 lineages [3]. In this study, we inferred a large phylogenetic tree for the grass family and estimated, through Bayesian molecular dating, the ages of the 17 to 18 independent grass C4 lineages. The first transition from C-3 to C-4 photosynthesis occurred in the Chloridoideae subfamily, 32.0-25.0 Mya. The link between CO2 decrease and transition to C-4 photosynthesis was tested by a novel maximum likelihood approach. We showed that the model incorporating the atmospheric CO2 levels was significantly better than the null model, supporting the importance Of CO2 decline on C-4 photosynthesis evolvability. This finding is relevant for understanding the origin Of C-4 photosynthesis in grasses, which is one of the most successful ecological and evolutionary innovations in plant history.
引用
收藏
页码:37 / 43
页数:7
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