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

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 h...

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Published in:Plant physiology (Bethesda) 2010-11, Vol.154 (3), p.1372-1380
Main Authors: Perrine-Walker, Francine, Doumas, Patrick, Lucas, Mikael, Vaissayre, Virginie, Beauchemin, Nicholas J., Band, Leah R., Chopard, Jérome, Crabos, Amandine, Conejero, Geneviève, Péret, Benjamin, King, John R., Verdeil, Jean-Luc, Hocher, Valérie, Franche, Claudine, Bennett, Malcolm J., Tisa, Louis S., Laplaze, Laurent
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Auxins
Biological and medical sciences
Biosynthesis
Carrier Proteins - metabolism
Computational Biology
Economic plant physiology
Forestry
Frankia
Fundamental and applied biological sciences. Psychology
Gene Expression Profiling
Indoleacetic Acids - metabolism
Infections
Insulin antibodies
Life Sciences
Magnoliopsida - genetics
Magnoliopsida - metabolism
Magnoliopsida - microbiology
Models, Biological
Molecular Sequence Data
Nodules
Parasitism and symbiosis
Plant cells
Plant physiology and development
Plant Proteins - metabolism
Plant roots
Plants
PLANTS INTERACTING WITH OTHER ORGANISMS
Root Nodules, Plant - metabolism
Symbiosis
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
Vegetal Biology
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Summary: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.
ISSN:0032-0889
1532-2548
1532-2548
DOI:10.1104/pp.110.163394