Figure 2. PLS-DA score plot of B. pseudotriquetrum at room temperature and under cold stress in ESI+ mode (A) (R2X = 0.449, R2Y = 0.997, Q2Y = 0.676) and in ESI- mode (B) (R2X = 0.728, Q2Y=0.961, Q2=0.804), P. patens at room temperature and under cold stress in ESI+ mode (C) (R2X = 0.768, R2Y = 0.986, Q2 = 0.693) and in ESI- mode (D) (R2X = 0.893, R2Y = 0.969, Q2 = 0.740).