Differential regulation of the Epr3 receptor coordinates membrane-restricted rhizobial colonization of root nodule primordia

Yasuyuki Kawaharada, Mette W. Nielsen, Simon Kelly, Euan K. James, Kasper R. Andersen, Sheena R. Rasmussen, Winnie Füchtbauer, Lene H. Madsen, Anne B. Heckmann, Simona Radutoiu and Jens Stougaard ()
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Yasuyuki Kawaharada: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Mette W. Nielsen: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Simon Kelly: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Euan K. James: The James Hutton Institute, Invergowrie
Kasper R. Andersen: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Sheena R. Rasmussen: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Winnie Füchtbauer: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Lene H. Madsen: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Anne B. Heckmann: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Simona Radutoiu: Centre for Carbohydrate Recognition and Signalling, Aarhus University
Jens Stougaard: Centre for Carbohydrate Recognition and Signalling, Aarhus University

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract In Lotus japonicus, a LysM receptor kinase, EPR3, distinguishes compatible and incompatible rhizobial exopolysaccharides at the epidermis. However, the role of this recognition system in bacterial colonization of the root interior is unknown. Here we show that EPR3 advances the intracellular infection mechanism that mediates infection thread invasion of the root cortex and nodule primordia. At the cellular level, Epr3 expression delineates progression of infection threads into nodule primordia and cortical infection thread formation is impaired in epr3 mutants. Genetic dissection of this developmental coordination showed that Epr3 is integrated into the symbiosis signal transduction pathways. Further analysis showed differential expression of Epr3 in the epidermis and cortical primordia and identified key transcription factors controlling this tissue specificity. These results suggest that exopolysaccharide recognition is reiterated during the progressing infection and that EPR3 perception of compatible exopolysaccharide promotes an intracellular cortical infection mechanism maintaining bacteria enclosed in plant membranes.

Date: 2017
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DOI: 10.1038/ncomms14534

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