Fig. 2.

Multivariate statistical analysis of JHKC accessions and CK cultivars (FDDB, YK10, and ZYQ): (A) PCA score plot; (B) PLS-DA score plot, R²X = 79.1%, R²Y = 99.6%, Q² = 98.7%; (C) cross-validation plot of PLS-DA model with 200 permutation tests; (D) S-plot of PLS-DA (the red dots represent the most differential compounds); (E) PCA biplot of the levels of differential metabolites in JHKC accessions and CK cultivars (FDDB, YK10, and ZYQ). The orange diamonds represent tea samples, and the green dots represent metabolites. Positive correlations are present between any two variables located in the same quadrant.