DNAI1 and infection: Since WRKY38 expression is known to be induced by SA treatment (Blanco et al. 2009), we questioned if NHP-induced expression of WRKY38 is dependent on SA derived from the ICS1/SID2 biosynthetic pathway by utilizing the well-characterized sid2-2 mutant that does not accumulate SA upon pathogen infection (Wildermuth et al. 2001).