Transcript levels of the TaWIR1 genes in Barley stripe mosaic virus (BSMV)‐mediated virus‐induced gene silenced wheat seedlings of cv. Renan. Mean transcript levels of TaWIR1a, TaWIR1b and TaWIR1c, relative to mock‐inoculated controls, are shown for two independent experiments, consisting of three biological replicates, inoculated with BSMV:WIR1 or the BSMV:GFP control. Relative transcript levels which do not differ significantly from each other are represented by the same lower case letter. Error bars show standard errors.