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. 2019 Jan 1;6:1. doi: 10.1038/s41438-018-0066-6

Fig. 6. Principal component analysis and correlation plot in endive STL pathway.

Fig. 6

a PCA biplot of STL contents and biosynthesis/transcription factor gene expressions in curly- and smooth-leafed endives. GAS germacrene A synthase, GAO germacrene A oxidase, COS costunolide synthase. Lp lactucopicrin, Lc lactucin, DHLc 11(S),13-dihydrolactucin, dLc 8-deoxylactucin, DHdLc 11(S),13-dihydro-8-deoxylactucin, DHLp 11(s),13-dihydrolactucopicrin. b The Pearson’s coefficient (r) and correlation significance (asterisks) are disposed in a symmetric matrix made with the same variables as in PCA. The heat map places variables in hierarchical clustering; negative and positive correlations assign (r) values in red and blue squares, respectively; bold values refer to significant correlations. *, **, *** = significant at P ≤ 0.05, 0.01, and 0.001, respectively; n.s. non-significant