. 2021 May 20;12:643116. doi: 10.3389/fpls.2021.643116

TABLE 3.

Effects of nitrate and ammonium on antioxidant defense systems in leaves and roots of sweet sorghum with or without Cd stress under buffered pH condition.

Organ	Treatment	H₂O₂ content (μ mol g^–¹ FW)	Total antioxidants (%)	SOD activity (U g^–¹ FW)	CAT activity (Δ 240 μ g protein^–¹ min^–¹)	POD activity (Δ 470 μ g protein^–¹ min^–¹)	GSH content (μ g g^–¹ FW)
Leaves	N	173.8 ± 83.9^a	20.9 ± 9.1^a	145.3 ± 41.5^a	84.9 ± 24.4^b	103.1 ± 13.9^b	82.6 ± 39.5^a
	N + Cd	122.1 ± 39.1^a	11.6 ± 4.5^a	183.6 ± 18.3^a	176.3 ± 74.5^a	176.4 ± 65.9^a	86.7 ± 14.8^a
	A	181.1 ± 43.1^a	19.9 ± 3.9^a	157.4 ± 15.7^a	100.2 ± 31.7^ab	73.5 ± 20.7^b	85.9 ± 20.6^a
	A + Cd	223.2 ± 77.9^a	19.0 ± 6.6^a	178.1 ± 13.3^a	134.4 ± 59.5^ab	112.7 ± 37.7^b	110.7 ± 7.22^a
Roots	N	55.9 ± 28.5^a	6.25 ± 2.09^a	131.2 ± 21.0^a	29.9 ± 9.1^a	500.9 ± 140.9^a	18.9 ± 17.7^b
	N + Cd	35.8 ± 10.7^ab	3.51 ± 1.18^b	23.2 ± 6.17^c	42.9 ± 8.6^a	203.1 ± 28.3^b	41.2 ± 22.9^ab
	A	28.4 ± 12.2^ab	4.17 ± 1.64^ab	37.4 ± 16.2^c	39.3 ± 12.0^a	437.1 ± 75.8^a	46.6 ± 11.9^ab
	A + Cd	27.6 ± 1.34^b	3.42 ± 0.23^b	63.1 ± 13.4^b	46.9 ± 14.9^a	409.4 ± 52.7^a	54.3 ± 26.7^a

Values were means ± SD (n = 4). Different letters in the same column of leaves or roots represented significant differences at the level of 0.05 based on One-Way ANOVA and Duncan’s multiply analysis. N, nitrate; N + Cd, nitrate with Cd; A, ammonium; A + Cd, ammonium with Cd.