Fig. 3

A metabolic linkage map comparing primary and secondary metabolites of green and purple kohlrabi. The up arrow indicates that the mean value of the target metabolite is significantly higher (at P < 0.05). The down arrow indicates that the value of the metabolite is significantly lower (at P < 0.05). The horizontal bar means that mean values of the target compounds were not significantly different (at P < 0.05). A different letter (G and P) indicated green and purple kohlrabi, respectively