Mobile virus-derived siRNAs drive plant antiviral silencing through reiterated 3-4 cell immunization.
Mobile virus-derived siRNAs induce repeated 3-4 cell immunization events that effectively contain plant viruses, as shown in Arabidopsis roots infected with turnip yellows virus.
- Why it matters: Understanding how plants defend against viruses is crucial for improving crop resistance, but the specific role of mobile siRNAs in antiviral immunity has remained unclear due to experimental challenges.
- What they did: The study examined the natural phloem-restricted infection of TuYV in Arabidopsis roots at cellular resolution, revealing complex mechanisms involving vsiRNA movement and localized immunization events.
- The result: VsiRNA-mediated immunization primarily accounts for viral containment across tissues, confining both TuYV and unrelated viruses within a few cells, highlighting a fundamental component of plant antiviral defense.