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Updated: Jan 20, 2026

Screening and Identification of RNA Silencing Suppressors from Secreted Effectors of Plant Pathogens
Published on: February 3, 2020
A sensitive and rapid RNA silencing suppressor activity assay based on alfalfa mosaic virus expression vector
Mireya Martínez-Pérez1, José A Navarro1, Vicente Pallás1
1Department of Molecular and Evolutionary Plant Virology, Instituto de Biología Molecular y Celular de Plantas (IBMCP) (UPV-CSIC), Universitat Politècnica de Valencia, Ingeniero Fausto Elio s/n, 46022 Valencia, Spain.
Abstract:
Plant viruses express RNA silencing suppressor (RSS) proteins to counteract plant defence mechanisms. Here, we describe a method to assess the RSS activity based on an alfalfa mosaic virus (AMV) RNA 3 expression vector and transgenic Nicotiana tabacum plants that express the P1 and P2 subunits of the AMV replicase (P12 plants). Inoculation of P12 plants with different AMV RNA 3 constructs expressing different HC-Pro mutants that differ in their RSS capabilities, revealed a perfect correlation between necrotic lesions on inoculated leaves and RSS activity. Protoplast analysis showed that the RSS activity correlated with the accumulation of the AMV RNAs. A direct comparison between three RSS activity assays and the AMV-P12 system revealed that the coat protein of carnation mottle virus displays RSS activity with the four assays and reduced the accumulation of the siRNAs.
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