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

Quilbé Johan, Lamy Léo, Brottier Laurent, Leleux Philippe, Fardoux Joël, Rivallan Ronan, Benichou Thomas, Guyonnet Rémi, Becana Manuel, Villar Irene, Garsmeur Olivier, Hufnagel Barbara, Delteil Amandine, Gully Djamel, Chaintreuil Clémence, Pervent Marjorie, Cartieaux Fabienne, Bourge Mickael, 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. 2021. Genetics of nodulation in Aeschynomene evenia uncovers mechanisms of the rhizobium-legume symbiosis. Nature Communications, 12:829, 14 p.

https://doi.org/10.1038/s41467-021-21094-7

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Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : 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.

Mots-clés Agrovoc : phytogénétique, Aeschynomene, symbiose, nodosité racinaire, formation de nodosités, Rhizobium, légumineuse, Fabaceae

Mots-clés complémentaires : Aeschynomene evenia

Mots-clés libres : Agricultural genetics, Plant genetics, Rhizobial symbiosis

Classification Agris : F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

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