Figure 4.

Northern blots showing the artificial trans‐acting small interfering RNA (atasi‐RNA) production in T₀ transgenic tobacco plants. Northern blot of siRNA isolated from the top leaf of six‐leaf stage T₀ transgenic tobacco plants harbouring TRiV‐AC2 (A) and TRiV‐AC4 (B). The numbers on the lanes represent the plant identifier numbers, and UT indicates untransformed plants as controls. Sizes of standard marker RNAs are indicated at the sides and relative band intensities of siRNAs are indicated at the bottom. nt, nucleotides.