Angiosperm Flora of India

Auxin Carriers Localization Drives Auxin Accumulation in Plant Cells Infected by Frankia in Casuarina glauca Actinorhizal Nodules

Publication Type:Journal Article
Year of Publication:2010
Authors:Perrine-Walker, F, Doumas, P, LUCAS, MIKAËL, Vaissayre, V, Beauchemin, NJ, Band, LR, Chopard, J, Crabos, A, Conejero, G, Péret, B, King, JR, Verdeil, J-L, Hocher, V, Franche, C, Bennett, MJ, Tisa, LS, Laplaze, L
Journal:Plant Physiology
Date Published:2010
ISBN Number:00320889

Actinorhizal symbioses are mutualistic interactions between plants and the soil bacteria Frankia that lead to the formation of nitrogen-fixing root nodules. Little is known about the signaling mechanisms controlling the different steps of the establishment of the symbiosis. The plant hormone auxin has been suggested to play a role. Here we report that auxin accumulates within Frankia-infected cells in actinorhizal nodules of Casuarina glauca. Using a combination of computational modeling and experimental approaches, we establish that this localized auxin accumulation is driven by the cell-specific expression of auxin transporters and by Frankia auxin biosynthesis in planta. Our results indicate that the plant actively restricts auxin accumulation to Frankia-infected cells during the symbiotic interaction.

Short Title:Plant Physiology
Taxonomic name: 
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