NPR1 and infection: Since the sln1 mutation is able to reduce SA accumulation in npr1-3, it may affect SA accumulation in the presence of NPR1. To test this, we isolated sln1 single mutant in the F2 progeny of a cross between sln1 npr1-3 and the wild-type Col-0 using the npr1-3 dCAPS marker (Table S1) and based on SA levels accumulated in the plants upon Psm ES4326 infection.