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Background   NPR1  is a gene of  Arabidopsis thaliana  required for the perception of salicylic acid. This perception triggers a defense response and negatively regulates the perception of jasmonates. Surprisingly, the application of methyl jasmonate also induces resistance, and  NPR1  is also suspected to be relevant. Since an allelic series of  npr1  was recently described, the behavior of these alleles was tested in response to methyl jasmonate.    Results  The response to methyl jasmonate of different  npr1s  alleles and  NPR1  paralogs null mutants was measured by the growth of a pathogen. We have also tested the subcellular localization of some npr1s, along with the protein-protein interactions that can be measured in yeast. The localization of the protein in  npr1  alleles does not affect the response to methyl jasmonate. In fact,  NPR1  is not required. The genes that are required in a redundant fashion are the  BOPs . The  BOPs  are paralogs of  NPR1 , and they physically interact with the TGA family of transcription factors.    Conclusions  Some  npr1  alleles have a phenotype in this response likely because they are affecting the interaction between BOPs and TGAs, and these two families of proteins are responsible for the resistance induced by methyl jasmonate in wild type plants.

The BLADE-ON-PETIOLE genes of Arabidopsis are essential for resistance induced by methyl jasmonate