Aeschynomene evenia, a Model Plant for Studying the Molecular Genetics of the Nod-Independent Rhizobium-Legume Symbiosys

Research on the nitrogen-fixing symbiosis has been focused, thus far, on two model legumes, Medicago truncatula and Lotus japonicus, which use a sophisticated infection process involving infection thread formation. However, in 25% of the legumes, the bacterial entry occurs more simply in an intercellular fashion. Among them, some Aeschynomene spp. are nodulated by photosynthetic Bradyrhizobium spp. that do not produce Nod factors. This interaction is believed to represent a living testimony of the ancestral state of the rhizobium-legume symbiosis. To decipher the mechanisms of this Nod-independent process, we propose Aeschynomene evenia as a model legume because it presents all the characteristics required for genetic and molecular analysis. It is a short-perennial and autogamous species, with a diploid and relatively small genome (2n=20; 460 Mb/1C). A. evenia 'IRFL6945' is nodulated by the well-characterized photosynthetic Bradyrhizobium sp. strain ORS278 and is efficiently transformed by Agrobacterium rhizogenes. Aeschynomene evenia is genetically homozygous but polymorphic accessions were found. A manual hybridization procedure has been set up, allowing directed crosses. Therefore, it should be relatively straightforward to unravel the molecular determinants of the Nod-independent process in A. evenia. This should shed new light on the evolution of rhizobium-legume symbiosis and could have important agronomic implications.

Crop
forages
Number of accessions
21
Creation date
March 5 2012
Published in Genesys
13 October 2023
Subset metadata

Subset creators


Not specified
Jean-François Arrighi
Not specified
Fabienne Cartieaux
Not specified
Spencer C Brown
Not specified
Marguerite Rodier-Goud
Not specified
Marc Boursot
Not specified
Joel Fardoux
Not specified
Delphine Patrel
Not specified
Djamel Gully
Not specified
Sandrine Fabre
Not specified
Clémence Chaintreuil
Not specified
Eric Giraud

Data and resources


MCPD passport data

MCPD - 39f23abd-c50a-4ee3-b413-3c03bbca39d7.xlsx

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Accessions

List of accessions included in the subset

2. CIAT7562Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KEX2F
3. CIAT7571Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KYY01
4. CIAT8223Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KYZA6
5. CIAT8228Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFBG~
6. CIAT8232Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFBT6
7. CIAT8242Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFC7K
8. CIAT8244Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFC8M
9. CIAT8245Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFCBQ
10. CIAT8251Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFCHX
11. CIAT8254Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFCKZ
12. CIAT8258Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFCP$
13. CIAT8261Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFCFV
14. CIAT8426Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KXF8P
15. CIAT8936Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFXMN
16. CIAT8938Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFXPQ
17. CIAT8944Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KFXVW
18. CIAT9539Aeschynomene evenia • WildBrazil
COL003 • DOI: 10.18730/KGAW1
19. CIAT18989Aeschynomene evenia • WildVenezuela
COL003 • DOI: 10.18730/KQD7X