Inhibition of auxin signaling in Frankia species-infected cells in Casuarina glauca nodules leads to increased nodulation

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Champion, Antony | Lucas, Mikael | Tromas, Alexandre | Vaissayre, Virginie | Crabos, Amandine | Diédhiou, Issa | Prodjinoto, Hermann | Moukouanga, Daniel | Pirolles, Elodie | Cissoko, Maïmouna | Bonneau, Jocelyne | Gherbi, Hassen | Franche, Claudine | Hocher, Valérie | Svistoonoff, Sergio | Laplaze, Laurent

Edité par CCSD ; Oxford University Press ; American Society of Plant Biologists -

International audience. Actinorhizal symbioses are mutualistic interactions between plants and the soil bacteria Frankia spp. that lead to the formation of nitrogen-fixing root nodules. The plant hormone auxin has been suggested to play a role in the mechanisms that control the establishment of this symbiosis in the actinorhizal tree Casuarina glauca. Here, we analyzed the role of auxin signaling in Frankia spp.-infected cells. Using a dominant-negative version of an endogenous auxin-signaling regulator, INDOLE-3-ACETIC ACID7, we established that inhibition of auxin signaling in these cells led to increased nodulation and, as a consequence, to higher nitrogen fixation per plant even if nitrogen fixation per nodule mass was similar to that in the wild type. Our results suggest that auxin signaling in Frankia spp.-infected cells is involved in the long-distance regulation of nodulation in actinorhizal symbioses.

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