Figure 1.

Genetic determinants of plant–virus interactions. (A) Viruses encode proteins to execute all parts of the infection cycle. Their expression is dependent on the host RNA translation machinery. Their activity requires host factors (pro‐viral) and resources. Antiviral immunity consists of host factors that target viral proteins or nucleic acids to restrict virus infection. (B) A two‐step model in plant–virus interactions. Compatibility is determined by the availability of pro‐viral host factors. Susceptibility is determined by the balance between antiviral defence and suppression of antiviral defence.