TRV1 can replicate and move systemically without TRV2 (i.e., RNA2). TRV2 encodes coat protein from the genomic and two nonstructural proteins from subgenomic RNAs (A). To develop the TRV-based VIGS vector, a cDNA clone of TRV1 or TRV2 (Ppk20 strain) was placed between a duplicated ...