Journal
NEW PHYTOLOGIST
Volume 212, Issue 3, Pages 637-645Publisher
WILEY
DOI: 10.1111/nph.14072
Keywords
BAK1-INTERACTING RECEPTOR-LIKE KINASE 1 (BIR1); BRASSINOSTEROID INSENSITIVE 1-ASSOCIATED RECEPTOR KINASE 1 (BAK1); cell death; plant immunity; receptor-like kinase; SUPPRESSOR OF BIR1-1 1 (SOBIR1)
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Funding
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Canada Foundation for Innovation (CFI)
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1252539] Funding Source: National Science Foundation
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The Arabidopsis receptor-like kinase (RLK) BIR1 (BAK1-INTERACTING RECEPTOR-LIKE KINASE 1) functions as a negative regulator of plant immunity. Previous work showed that loss-of-function of BIR1 leads to constitutive activation of cell death and defense responses. These autoimmune phenotypes are partially dependent on another RLK, SOBIR1. In order to identify additional components involved in the BIR1-regulated plant defense signaling pathway, a suppressor screen was carried out in the bir1-1 pad4-1 mutant background. Mutations in the suppressor mutants were identified by genetic mapping and re-sequencing of the mutant genomes. A number of suppressor mutants were found to carry mutations in an additional RLK, BAK1, indicating that BAK1 is required for activation of cell death and defense responses in bir1-1. Co-immunoprecipitation analysis revealed that BAK1 and SOBIR1 associate with each other in planta when the function of BIR1 is compromised. Although BAK1 was previously characterized as a negative regulator of cell death, our study highlights a novel role of BAK1 in promoting cell death and defense responses in conjunction with SOBIR1.
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