Journal
MOLECULAR BIOLOGY AND EVOLUTION
Volume 32, Issue 1, Pages 193-210Publisher
OXFORD UNIV PRESS
DOI: 10.1093/molbev/msu296
Keywords
nodulation; polyploidy; legume; symbiotic nitrogen fixation; Papilionoideae; Mimosoideae
Funding
- 1000 Plants (1KP) initiative
- Alberta Ministry of Innovation and Advanced Education
- Alberta Innovates Technology Futures (AITF) Innovates Centres of Research Excellence (iCORE)
- Musea Ventures
- BGI-Shenzhen
- National Science Foundation [DEB 0830009, IOS 0922742, IOS 0822258, DEB 1257522]
- NIH [1R01DA025197-02]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1229956] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0922742] Funding Source: National Science Foundation
Ask authors/readers for more resources
Unresolved questions about evolution of the large and diverse legume family include the timing of polyploidy (wholegenome duplication; WGDs) relative to the origin of themajor lineages within the Fabaceae and to the origin of symbiotic nitrogen fixation. Previous work has established that a WGD affects most lineages in the Papilionoideae and occurred sometime after the divergence of the papilionoid and mimosoid clades, but the exact timing has been unknown. The history of WGD has also not been established for legume lineages outside the Papilionoideae. We investigated the presence and timing of WGDs in the legumes by querying thousands of phylogenetic trees constructed from transcriptome and genome data from 20 diverse legumes and 17 outgroup species. The timing of duplications in the gene trees indicates that the papilionoid WGD occurred in the common ancestor of all papilionoids. The earliest diverging lineages of the Papilionoideae include both nodulating taxa, such as the genistoids (e.g., lupin), dalbergioids (e.g., peanut), phaseoloids (e.g., beans), and galegoids (= Hologalegina, e.g., clovers), and clades with nonnodulating taxa including Xanthocercis and Cladrastis (evaluated in this study). We also found evidence for several independent WGDs near the base of other major legume lineages, including the Mimosoideae-Cassiinae-Caesalpinieae (MCC), Detarieae, and Cercideae clades. Nodulation is found in the MCC and papilionoid clades, both of which experienced ancestral WGDs. However, there are numerous nonnodulating lineages in both clades, making it unclear whether the phylogenetic distribution of nodulation is due to independent gains or a single origin followed by multiple losses.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available