Auxin carriers localization drives auxin accumulation in plant cells infected by Frankia in Casuarina glauca actinorhizal nodules.

Abstract : 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.
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Submitted on : Tuesday, January 11, 2011 - 11:41:39 AM
Last modification on : Friday, January 10, 2020 - 9:36:04 AM

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Francine Perrine-Walker, Patrick Doumas, Mikael Lucas, Virginie Vaissayre, Nicholas J Beauchemin, et al.. Auxin carriers localization drives auxin accumulation in plant cells infected by Frankia in Casuarina glauca actinorhizal nodules.. Plant Physiology, American Society of Plant Biologists, 2010, 154 (3), pp.1372-80. ⟨10.1104/pp.110.163394⟩. ⟨hal-00554754⟩

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