Table 3 Experimental values measured for each trait based on the central compositions designs (CCD).

Irrigation levels (FC^* %)	65	50	50	35	50	75	65	35	25
Melatonin (mM)	155	0	155	70	300	155	70	240	155
Dry weight (g)	78.38	35.89	61.10	32.92	40.26	94.25	59.92	59.61	25.45
Chl a (mg g⁻¹ FW)	2.73	1.71	2.34	1.50	1.67	2.89	2.37	2.69	1.39
Chl b (mg g⁻¹ FW)	0.89	0.45	0.88	0.67	0.40	0.92	0.83	0.79	0.42
Chl total (mg g⁻¹ FW)	3.62	2.16	3.22	2.17	2.07	3.81	3.20	3.48	1.82
Phenol content (mg GAE g⁻¹ DW)	28.84	21.55	31.93	21.92	22.65	18.01	24.22	26.83	18.24
Flavonoid content (mg QE g⁻¹ DW)	13.86	8.87	16.33	10.79	11.66	6.48	12.06	11.96	8.15
Proline (µmole g⁻¹ FW)	2.19	3.12	2.86	2.99	2.72	1.75	2.99	3.04	3.43
Malondialdehyde (nmole g⁻¹ FW)	3.50	5.68	4.26	5.75	4.71	3.34	4.34	5.21	6.42
H₂O₂ (µmole g⁻¹ FW)	1.69	3.16	2.79	3.52	3.09	1.53	2.24	2.92	4.77
Essential oil content (%)	2.24	1.39	2.38	1.60	1.71	1.01	1.51	2.03	1.19
Essential oil yield (g plant⁻¹)	1.75	0.50	1.46	0.53	0.69	0.95	0.90	1.21	0.30

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