Figure 6
Induction of virus resistance by salicylic acid. Based on our data we propose that salicylic acid (SA)-mediated signaling (dashed arrows) induces several distinct mechanisms that inhibit (solid blunt-ended lines) virus infection. For some viruses, exemplified by potato virus X (PVX), anti-viral mechanisms regulated by alternative oxidase (AOX) play a predominant role. Other viruses, exemplified by tobacco mosaic virus (TMV), are affected not only by AOX-modulated mechanisms and RDR1-mediated antiviral RNA silencing but also by other, unknown mechanisms.