Effects of CuSO4 concentration (0, 100, 150 μM) on grapevine carotenoids (nmol g-1 FW) and t chlorophyll a (nmol g-1 FW) concentrations. Values followed by different letters in the same column are significantly different at P

Table 2: Effects of CuSO4 concentration (0, 100, 150 μM) on grapevine carotenoids (nmol g^-1 FW) and t chlorophyll a (nmol g^-1 FW) concentrations. Values followed by different letters in the same column are significantly different at P < 0.05. (n = 5, ± SE).

Treatments	Carotenoids mg g⁻¹ FW	Chlorophyll a mg g⁻¹ DW
0 CuSO₄	75 ± 1.5a	7.1 ± 0.1a
100 μM CuSO₄	83 ± 1.7ab	7.5 ± 0.4a
150 μM CuSO₄	90 ± 2.0c	8.3 ± 0.2c
0,1 mM melatonin	79 ± 1.9a	7.3 ± 0.1a
100 μM CuSO₄+ 0.1 mM melatonin	81 ± 1.2a	7.4 ± 0.3a
150 μM CuSO₄+ 0.1 mM melatonin	85 ± 1.0b	7.9 ± 0.1b