期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5087
关键词
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资金
- TRY initiative on plant traits
- DIVERSITAS/Future Earth
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig IGBP
- Global Land Project
- French Foundation for Biodiversity Research (FRB)
- GIS Climat, Environnement et Societe, France
- Netherlands Organisation for Scientific Research [836.10.001, 864.10.005]
- European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC [335542]
Symbiotic associations occur in every habitat on earth, but we know very little about their evolutionary histories. Current models of trait evolution cannot adequately reconstruct the deep history of symbiotic innovation, because they assume homogenous evolutionary processes across millions of years. Here we use a recently developed, heterogeneous and quantitative phylogenetic framework to study the origin of the symbiosis between angiosperms and nitrogen-fixing (N-2) bacterial symbionts housed in nodules. We compile the largest database of global nodulating plant species and reconstruct the symbiosis' evolution. We identify a single, cryptic evolutionary innovation driving symbiotic N-2-fixation evolution, followed by multiple gains and losses of the symbiosis, and the subsequent emergence of 'stable fixers' (clades extremely unlikely to lose the symbiosis). Originating over 100 MYA, this innovation suggests deep homology in symbiotic N-2-fixation. Identifying cryptic innovations on the tree of life is key to understanding the evolution of complex traits, including symbiotic partnerships.
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