Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 16, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2023738118
Keywords
rice; arbuscule mycorrhizal symbiosis; receptors; competition; immunity
Categories
Funding
- NSF [32088102, 31730103, 31825003]
- National Key R&D Program of China [2019YFA0904703, 2016YFA0500502]
- Ministry of Agriculture of China for Transgenic Research [2016ZX08009-003-001, 2016ZX08009003005-003]
- Strategic Priority Research Program Molecular Mechanism of Plant Growth and Development of the Chinese Academy of Sciences [XDB27040207]
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Plants discern symbiotic and immune signals through receptor competition involving OsMYR1 and OsCEBiP to determine the outcome of interactions with various microbes.
Plants encounter various microbes in nature and must respond appropriately to symbiotic or pathogenic ones. In rice, the receptor-like kinase OsCERK1 is involved in recognizing both symbiotic and immune signals. However, how these opposing signals are discerned via OsCERK1 remains unknown. Here, we found that receptor competition enables the discrimination of symbiosis and immunity signals in rice. On the one hand, the symbiotic receptor OsMYR1 and its short-length chitooligosaccharide ligand inhibit complex formation between OsCERK1 and OsCEBiP and suppress OsCERK1 phosphorylating the downstream substrate OsGEF1, which reduces the sensitivity of rice to microbe-associated molecular patterns. Indeed, OsMYR1 overexpression lines are more susceptible to the fungal pathogen Magnaporthe oryzae, whereas Osmyr1 mutants show higher resistance. On the other hand, OsCEBiP can bind OsCERK1 and thus block OsMYR1-OsCERK1 heteromer formation. Consistently, the Oscebip mutant displayed a higher rate of mycorrhizal colonization at early stages of infection. Our results indicate that OsMYR1 and OsCEBiP receptors compete for OsCERK1 to determine the outcome of symbiosis and immunity signals.
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