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Principal component analysis (PCA) performed on 20 individuals (apple cultivars) and six triterpene concentrations. (a) Score plot of the 20 cultivars separating into three russeting groups: russeted, semi‐russeted, and waxy. (b) Loading plot showing the relationships among phytochemical data. UA, ursolic acid; BA, betulinic acid; BA‐cisC, betulinic acid‐3‐cis‐caffeate; BA‐transC, betulinic acide‐3‐trans‐caffeate.
