Quantification of hpRNA derived from the transgene expression is significantly lower in the resistant plum rootstocks than in the susceptible or tolerant plum lines.
Real time PCR quantification of the transgene hpRNA amount in leaves from the different transgenic plum lines demonstrated a significantly lower amount in the resistant plum lines St5’-1 and St5’-9, used as rootstocks, than in the susceptible plum line St5’-7 and the tolerant St5’-6 (Figure 4). No significant differences were found between St5’-7 and St5’-6 lines in hpRNA quantification.