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Developmental Modulation of Root Cell Wall Architecture Confers Resistance to an Oomycete Pathogen

Gavrin, Aleksandr; Rey, Thomas; Torode, Thomas A.; Toulotte, Justine; Chatterjee, Abhishek; Louis Kaplan, Jonathan; Evangelisti, Edouard; Takagi, Hiroki; Charoensawan, Varodom; Rengel, David; Journet, Etienne-Pascal; Debellé, Frédéric; de Carvalho-Niebel, Fernanda; Terauchi, Ryohei; Braybrook, Siobhan; Schornack, Sebastian

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Authors

Aleksandr Gavrin

Thomas Rey

Justine Toulotte

Abhishek Chatterjee

Jonathan Louis Kaplan

Edouard Evangelisti

Hiroki Takagi

Varodom Charoensawan

David Rengel

Etienne-Pascal Journet

Frédéric Debellé

Fernanda de Carvalho-Niebel

Ryohei Terauchi

Siobhan Braybrook

Sebastian Schornack



Abstract

The cell wall is the primary interface between plant cells and their immediate environment and must balance multiple functionalities, including the regulation of growth, the entry of beneficial microbes, and protection against pathogens. Here, we demonstrate how API, a SCAR2 protein component of the SCAR/WAVE complex, controls the root cell wall architecture important for pathogenic oomycete and symbiotic bacterial interactions in legumes. A mutation in API results in root resistance to the pathogen Phytophthora palmivora and colonization defects by symbiotic rhizobia. Although api mutant plants do not exhibit significant overall growth and development defects, their root cells display delayed actin and endomembrane trafficking dynamics and selectively secrete less of the cell wall polysaccharide xyloglucan. Changes associated with a loss of API establish a cell wall architecture with altered biochemical properties that hinder P. palmivora infection progress. Thus, developmental stage-dependent modifications of the cell wall, driven by SCAR/WAVE, are important in balancing cell wall developmental functions and microbial invasion.

Acceptance Date Aug 4, 2020
Publication Date Nov 2, 2020
Publicly Available Date Mar 28, 2024
Journal Current Biology
Print ISSN 0960-9822
Publisher Elsevier
Pages 4165 - 4176.e5
DOI https://doi.org/10.1016/j.cub.2020.08.011
Keywords Medicago truncatula, Phytophthora, Rhizobia, SCAR/WAVE, cell wall, disease resistance, root endosymbiosis, susceptibility gene
Publisher URL https://doi.org/10.1016/j.cub.2020.08.011

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