Journal
PLANT PHYSIOLOGY
Volume 167, Issue 3, Pages 1149-1157Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.114.255307
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Funding
- Institut de Recherche pour le Developpement (Ph.D. grant)
- Agence Nationale de la Recherche [ANR-08-JCJC-0070-01]
- Agence Nationale de la Recherche (ANR) [ANR-08-JCJC-0070] Funding Source: Agence Nationale de la Recherche (ANR)
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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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