Table 4.

Simple Pearson’s correlation of total phenolics with antioxidant activity in S. rebaudiana Bertoni cellular compounds of callus from leaf and stem explants in response to different concentrations of proline.

Callus from Leaf.	r2	Coefficient of Correlation %	p-Value
2.0 µM NAA (control)	0.93	96.80	0.0320
2.0 µM NAA + 2.0 µM PRO	0.47	68.32	n.s.1
2.0 µM NAA + 3.0 µM PRO	0.96	98.03	0.0196
2.0 µM NAA + 4.0 µM PRO	0.71	84.47	0.0167
2.0 µM NAA + 5.0 µM PRO	0.89	94.66	0.0146
Callus from stem
2.0 µM NAA (control)	0.96	97.79	0.0020
2.0 µM NAA + 2.0 µM PRO	0.56	75.08	n.s.
2.0 µM NAA + 3.0 µM PRO	0.85	92.50	0.0444
2.0 µM NAA + 4.0 µM PRO	0.91	95.81	0.0419
2.0 µM NAA + 5.0 µM PRO	0.43	65.44	n.s.

n.s., not significant; NAA, α–naphthylene acetic acid; PRO, proline.