Poaceae-specific cell wall-derived oligosaccharides activate plant immunity via OsCERK1 during Magnaporthe oryzae infection in rice

Chao Yang, Rui Liu, Jinhuan Pang, Bin Ren, Huanbin Zhou, Gang Wang, Ertao Wang and Jun Liu ()
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Chao Yang: Chinese Academy of Sciences
Rui Liu: Chinese Academy of Sciences
Jinhuan Pang: Chinese Academy of Sciences
Bin Ren: Chinese Academy of Agricultural Sciences
Huanbin Zhou: Chinese Academy of Agricultural Sciences
Gang Wang: Chinese Academy of Sciences
Ertao Wang: Chinese Academy of Sciences
Jun Liu: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-13

Abstract: Abstract Many phytopathogens secrete cell wall degradation enzymes (CWDEs) to damage host cells and facilitate colonization. As the major components of the plant cell wall, cellulose and hemicellulose are the targets of CWDEs. Damaged plant cells often release damage-associated molecular patterns (DAMPs) to trigger plant immune responses. Here, we establish that the fungal pathogen Magnaporthe oryzae secretes the endoglucanases MoCel12A and MoCel12B during infection of rice (Oryza sativa). These endoglucanases target hemicellulose of the rice cell wall and release two specific oligosaccharides, namely the trisaccharide 31-β-D-Cellobiosyl-glucose and the tetrasaccharide 31-β-D-Cellotriosyl-glucose. 31-β-D-Cellobiosyl-glucose and 31-β-D-Cellotriosyl-glucose bind the immune receptor OsCERK1 but not the chitin binding protein OsCEBiP. However, they induce the dimerization of OsCERK1 and OsCEBiP. In addition, these Poaceae cell wall-specific oligosaccharides trigger a burst of reactive oxygen species (ROS) that is largely compromised in oscerk1 and oscebip mutants. We conclude that 31-β-D-Cellobiosyl-glucose and 31-β-D-Cellotriosyl-glucose are specific DAMPs released from the hemicellulose of rice cell wall, which are perceived by an OsCERK1 and OsCEBiP immune complex during M. oryzae infection in rice.

Date: 2021
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DOI: 10.1038/s41467-021-22456-x

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