Fig. 2

Comparisons of metabolite profiles in the first and second flower buds. A-C orthogonal projection to latent structures discriminant analysis (OPLS-DA) score plot for the different stages, comparing metabolite between the first and secondlower buds. n = 5. t1 represents the score values of the main components and reveals the differences between groups; to1 displays the score value of the orthogonal component and the difference within the group; Q2 represented the prediction ability of OPLS-DA model. D-F Heatmap of the classification in the different stage comparing between the first and second flower bud differentiations on metabolite profiles. S1, S2, S3 represent the early, middle, and later stage of the first flower bud differentiation, respectively. S4, S5, S6 represent the early, middle, and later stage of the second flower bud differentiation, respectively