In plants, the salicylic acid (SA) and jasmonic acid (JA) signaling pathways usually mediate the defense response to biotrophic and necrotrophic pathogens, respectively. Our previous work showed that after non-heading Chinese cabbage (NHCC) was infected with the biotrophic pathogen , expression of the JA biosynthetic gene is induced; however, its molecular mechanism remains unclear. Here, we overexpressed in and silenced in NHCC001 plants to study the defensive role of in plants against pathogen invasion. The results showed that overexpression of increased the susceptibility of to pv. DC3000 ( DC3000) but enhanced its resistance to . -silenced NHCC001 plants with a 50% reduction in expression increased their resistance to downy mildew by reducing the hyphal density and spores of . In addition, -partly silenced NHCC001 plants were also resistant to , which could be the result of a synergistic effect of JA and SA. These findings indicate a complicated role of in the mediating defense responses to biotrophic and necrotrophic pathogens.
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