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Principal-component analysis (PCA) for total phenolics (TP), total flavonoids (TF), stevioside (Stev), rebaudioside A (Reb A), rebaudioside A/stevioside ratio, and antioxidant activity (AA) in cellular compounds of callus from leaf explants influenced by different concentrations and combination of α-naphthalene acetic acid (NAA) and proline (PRO) (2.0 µM NAA (control), 2.0 µM NAA + 2.0 µM PRO, 2.0 µM NAA + 3.0 µM PRO, 2.0 µM NAA + 4.0 µM PRO, and 2.0 µM NAA + 5.0 µM PRO).
