NPR1 and viral infectious disease: Our results suggested that NPR1 may play an important role in SA-mediated resistance, and both PhaNPR1 and PhaPR1 are induced upon SA treatment and virus infection; therefore, we transiently knocked down the expression of PhaNPR1 using short hairpin sequences to examine whether it is required for PhaPR1 transcript accumulation during virus infection and resistance against CymMV.