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.