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Genetics of nodulation in Aeschynomene evenia uncovers mechanisms of the rhizobium–legume symbiosis

Among legumes (Fabaceae) capable of nitrogen-fixing nodulation, several Aeschynomene spp. use a unique symbiotic process that is independent of Nod factors and infection threads. They are also distinctive in developing root and stem nodules with photosynthetic bradyrhizobia. Despite the significance...

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Detalles Bibliográficos
Autores principales: Quilbé, Johan, Lamy, Léo, Brottier, Laurent, Leleux, Philippe, Fardoux, Joël, Rivallan, Ronan, Benichou, Thomas, Guyonnet, Rémi, Becana, Manuel, Villar, Irene, Garsmeur, Olivier, Hufnagel, Bárbara, Delteil, Amandine, Gully, Djamel, Chaintreuil, Clémence, Pervent, Marjorie, Cartieaux, Fabienne, Bourge, Mickaël, Valentin, Nicolas, Martin, Guillaume, Fontaine, Loïc, Droc, Gaëtan, Dereeper, Alexis, Farmer, Andrew, Libourel, Cyril, Nouwen, Nico, Gressent, Frédéric, Mournet, Pierre, D’Hont, Angélique, Giraud, Eric, Klopp, Christophe, Arrighi, Jean-François
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7864950/
https://www.ncbi.nlm.nih.gov/pubmed/33547303
http://dx.doi.org/10.1038/s41467-021-21094-7
Descripción
Sumario:Among legumes (Fabaceae) capable of nitrogen-fixing nodulation, several Aeschynomene spp. use a unique symbiotic process that is independent of Nod factors and infection threads. They are also distinctive in developing root and stem nodules with photosynthetic bradyrhizobia. Despite the significance of these symbiotic features, their understanding remains limited. To overcome such limitations, we conduct genetic studies of nodulation in Aeschynomene evenia, supported by the development of a genome sequence for A. evenia and transcriptomic resources for 10 additional Aeschynomene spp. Comparative analysis of symbiotic genes substantiates singular mechanisms in the early and late nodulation steps. A forward genetic screen also shows that AeCRK, coding a receptor-like kinase, and the symbiotic signaling genes AePOLLUX, AeCCamK, AeCYCLOPS, AeNSP2, and AeNIN are required to trigger both root and stem nodulation. This work demonstrates the utility of the A. evenia model and provides a cornerstone to unravel mechanisms underlying the rhizobium–legume symbiosis.