Fig. 4 in Phytochemical profiling of several Hypericum species identified using genetic markers

Fig. 4. PCA (A) and HCA (B) analyses of 13 metabolites quantified in the extracts of shoots of ex vitro grown Hypericum plants. The PCA biplot (A) shows grouping of the species (points), and the contribution (loadings) of the variables (metabolites, indicated by the arrows) to the grouping. Each species is represented by three biological replicates (three points per species). The points are colored according to their quality of representation on the factor map, expressed by squared cosine (cos2). The direction and length of the loading vectors show how each metabolite contributes to clustering. An ellipse is drawn around each cluster. The species are clustered according to the branches as depicted at HCA dendrogram (B). Each square in the heatmap dendrogram represents the relative content of a metabolite. The red and blue color represent an increase and a decrease of relative metabolite content, respectively. Different color of metabolites (PCA) or lines under the heatmap (HCA) indicate the metabolite contents in leaves (green) and stems (brown). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)