Figure 2.
The scatter plot of the orthogonal partial least squares projection to latent structures differential analysis (OPLS-DA) scores generated from the gas chromatography combined with time-of-flight-mass spectrometry (GC-TOF-MS) data (n = 24) on Z. barbatum accessions. The first two principle components of the principal component analysis (PCA) accounted for a total of 22% of the variance.