Total RNA was isolated from the frozen peanut leaves and then reverse-transcribed into
cDNA. Reverse transcription was performed using an ABI 7500 FAST Real-Time PCR System.
The primers Actin-F and Actin-R were used to amplify the peanut reference gene Ah-Actin, and
the primers Ah-Chi-F and Ah-Chi-R were used to amplify the peanut chitinase gene (Ah-Chi). The
sequences of all primers used in this study are listed in Table 1. The amplification protocol was
as follows: 95°C for 2 min; followed by 40 cycles of 95°C for 10 s and 60°C for 40 s; and then a
slow increase to 95°C. A dissociation curve was then prepared. Each reaction was repeated. The
relative level of expression of the target gene was calculated according to the 2
method of
Livak and Schmittgen (2002).
- (ΔΔ Ct)