<p>The expression patterns were analyzed using the quantitative RT-PCR method. PCR was carried out in triplicates for each biological sample. Three independent biological replicates were performed. <i>SmUBQ10</i> was used as a reference. Fold changes of <i>SmRDRs</i> in leaves of <i>S. miltiorrhiza</i> plantlets infected with CMV for 12, 24, 48 and 72 h are shown. The level of transcripts in leaves inoculated with phosphate buffered saline (CK) was arbitrarily set to 1 and the level in tissues inoculated with CMV was given relative to this. Error bars represent standard deviations of mean value from three biological replicates.</p
