. 2022 Jul 18;13:910714. doi: 10.3389/fpls.2022.910714

TABLE 5.

Effect of different levels of soil applied Cu (0, 30, or 60 mg kg^–1) and MEL (30, 40, or 50 μM) on, leaf NR [n mole NO₂ g^–1 (FM) s^–1], CA [mol (CO₂) kg^–1 (leaf FM) s^–1], HXK (U mg^–1 protein), FUM (μ mol mL^–1 fumarate), SDH (μg dye reduced g^–1 sample) activities and electrolyte leakage (%) in Brassica juncea at 45 DAS.

Treatments	NR	CA	HXK	FUM	SDH	EL
Control	423.10 ± 8.00^d	2.32 ± 0.044^de	0.067 ± 0.0025^f	19.21 ± 0.73^f	0.126 ± 0.0048^g	5.28 ± 0.20^ef
Cu (30 mg kg^–1)	387.10 ± 7.32^e	2.08 ± 0.039^f	0.073 ± 0.0028^e	21.86 ± 0.83^e	0.15 ± 0.0057^e	5.86 ± 0.22^d
Cu (60 mg kg^–1)	349.52 ± 6.61^f	1.89 ± 0.036^g	0.086 ± 0.0033^cd	25.37 ± 0.96^bc	0.168 ± 0.0064^cd	8.99 ± 0.34^a
MEL (30 μM)	467.45 ± 8.84^bc	2.62 ± 0.050^c	0.075 ± 0.0028^e	22.39 ± 0.85^d	0.146 ± 0.0055^f	4.96 ± 0.19^f
MEL (40 μM)	530.15 ± 10.03^a	3.00 ± 0.057^a	0.087 ± 0.0033^cd	26.07 ± 0.99^bc	0.171 ± 0.0065^bc	3.70 ± 0.14^g
MEL (50 μM)	495.72 ± 9.38^b	2.87 ± 0.054^ab	0.082 ± 0.0031^d	23.66 ± 0.89^d	0.163 ± 0.0062^d	4.19 ± 0.16^g
Cu (30) + MEL (30 μM)	431.19 ± 8.16^d	2.30 ± 0.043^de	0.083 ± 0.0031^d	23.12 ± 0.87^d	0.167 ± 0.0063^cd	5.89 ± 0.22^d
Cu (30) + MEL (40 μM)	456.82 ± 8.64^c	2.52 ± 0.048^cd	0.093 ± 0.0035^bc	26.39 ± 1.00^b	0.186 ± 0.0070^a	5.54 ± 0.21^e
Cu (30) + MEL (50 μM)	442.19 ± 8.36^cd	2.42 ± 0.046^d	0.088 ± 0.0033^cd	25.18 ± 0.95^bc	0.173 ± 0.0066^bc	5.66 ± 0.21^e
Cu (60) + MEL (30 μM)	415.08 ± 7.85^de	2.10 ± 0.040^ef	0.091 ± 0.0034^c	25.31 ± 0.96^bc	0.170 ± 0.0064^bc	8.34 ± 0.32^a
Cu (60) + MEL (40 μM)	439.12 ± 8.31^cd	2.28 ± 0.043^de	0.099 ± 0.0038^a	28.18 ± 1.07^a	0.187 ± 0.0071^a	6.28 ± 0.24^c
Cu (60) + MEL (50 μM)	431.37 ± 8.16^d	2.18 ± 0.041^e	0.095 ± 0.0036^b	26.32 ± 1.00^b	0.178 ± 0.0067^b	7.20 ± 0.27^b

Data shows the mean ± standard error. Same letters indicate that there is no significant difference at P < 0.05.