2.3. Reverse-transcription PCR
The iScript Select cDNA Synthesis kit protocol (BIO-RAD, Hercules,
CA, USA) was used to synthesize cDNA in a total reaction volume of
10 μl. The reaction mixture of the iScript selected cDNA synthesis kit
was prepared from 1 μl of total RNA (1 μg/μl), 2 μl of 5× iScript select reaction
mix, 0.25 μl of CMNV-R primer (10 μM), 1 μl of GSP enhancer solution,
0.5 μl of iScript reverse transcriptase, and 5.25 μl of nuclease-free
water. To perform RT-PCR, the RNA sample was activated at 42 °C for
30 min and then incubated at 85 °C for 5 min to inactivate the reverse
transcriptase. The cDNA product was further amplified by real-time
PCR for CMNV detection.