PLS-DA score scatter plots and permutation tests.

<p>(A) PLS-DA score plots resulted from the metabolites in tea plant leaves in the three different albescent stages (YG, WI and WII) and the G stage. The sampling groups are color coded as follows: black = YG-stage leaves; blue = WI-stage leaves; green = WII-stage leaves; and red = G-stage leaves. (B) Permutation tests of the PLS-DA model indicate the absence of over-fitting in the model.