Alteration of cell wall xylan acetylation triggers defense responses that counterbalance the immune deficiencies of plants impaired in the β-subunit of the heterotrimeric G-protein ...

• Main Authors: Escudero, Viviana, Jordá, Lucía, Sopeña-Torres, Sara, Mélida, Hugo, Miedes, Eva, Muñoz-Barrios, Antonio, Swami, Sanjay, Alexander, Danny, McKee, Lauren S., Sánchez-Vallet, Andrea, Bulone, Vincent, Jones, Alan M., Molina, Antonio
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2017
• Subjects: heterotrimeric G-protein; AGB1; agb1-2; plant cell wall; Xylan; necrotrophic fungi; Immunity; pathogen-associated molecular pattern; Plectosphaerella cucumerina; Arabidopsis thaliana; eskimo*
• Online Access: https://dx.doi.org/10.3929/ethz-b-000199095; http://hdl.handle.net/20.500.11850/199095

Arabidopsis heterotrimeric G-protein complex modulates pathogen-associated molecular pattern-triggered immunity (PTI) and disease resistance responses to different types of pathogens. It also plays a role in plant cell wall integrity as mutants impaired in the Gβ- (agb1-2) or Gγ-subunits have an altered wall composition compared with wild-type plants. Here we performed a mutant screen to identify suppressors of agb1-2 (sgb) that restore susceptibility to pathogens to wild-type levels. Out of the four sgb mutants (sgb10–sgb13) identified, sgb11 is a new mutant allele of ESKIMO1 (ESK1), which encodes a plant-specific polysaccharide O-acetyltransferase involved in xylan acetylation. Null alleles (sgb11/esk1-7) of ESK1 restore to wild-type levels the enhanced susceptibility of agb1-2 to the necrotrophic fungus Plectosphaerella cucumerina BMM (PcBMM), but not to the bacterium Pseudomonas syringae pv. tomato DC3000 or to the oomycete Hyaloperonospora arabidopsidis. The enhanced resistance to PcBMM of the agb1-2 ... : The Plant Journal, 92 (3) ...