Table 2: Open in new tab Leaf CAT (U mg...

Sex

Treatment

Leaf CAT

Leaf POD

Leaf SOD

Leaf GR

Root CAT

Root GR

Leaf MDA

Leaf O₂⁻

Female

−N−P

14.99 ± 1.4de

27.12 ± 1.4e

0.213 ± 0.02cd

6.81 ± 1.1f

0.482 ± 0.04cd

35.51 ± 4.2b

12.12 ± 1.24b

16.32 ± 0.68a

−N+P

21.80 ± 6.2cd

36.01 ± 4.4e

0.392 ± 0.06a

6.83 ± 0.40f

0.570 ± 0.04bc

20.87 ± 3.0de

15.44 ± 0.81a

11.77 ± 1.59b

+NO₃⁻−P

26.79 ± 2.1c

15.86 ± 1.7e

0.353 ± 0.03a

11.00 ± 2.1e

0.484 ± 0.02cd

50.98 ± 3.1a

6.59 ± 0.38de

12.35 ± 1.66b

+NO₃⁻+P

17.32 ± 2.5de

19.63 ± 2.5e

0.377 ± 0.04a

10.40 ± 1.34e

0.292 ± 0.05fg

32.18 ± 2.2b

4.78 ± 0.71fg

6.05 ± 0.75d

+NH₄⁺−P

73.1 ± 10.13a

26.03 ± 4.5e

0.269 ± 0.03bc

17.49 ± 1.3c

0.412 ± 0.06de

26.42 ± 4.3c

8.44 ± 0.43c

8.94 ± 1.26c

+NH₄⁺+P

10.09 ± 1.1e

19.90 ± 3.1e

0.394 ± 0.04a

14.53 ± 1.3d

0.489 ± 0.07cd

17.17 ± 2.1ef

4.46 ± 1.10fg

3.84 ± 0.56ef

Male

−N−P

56.03 ± 5.1b

175.09 ± 12.9b

0.414 ± 0.07a

14.44 ± 0.8d

0.354 ± 0.05ef

16.51 ± 1.93ef

7.38 ± 0.99cd

11.96 ± 0.60b

−N+P

29.78 ± 2.4c

218.52 ± 28a

0.284 ± 0.04b

14.01 ± 0.93d

0.599 ± 0.03b

22.35 ± 2.6cd

8.35 ± 1.39c

8.76 ± 0.82c

+NO₃⁻−P

58.98 ± 7.3b

222.99 ± 24.6a

0.286 ± 0.04b

29.54 ± 3.7a

0.410 ± 0.07de

24.3 ± 2.6cd

5.49 ± 0.29ef

5.13 ± 0.53de

+NO₃⁻+P

22.16 ± 3.1cd

120.07 ± 9.7c

0.192 ± 0.03d

5.72 ± 1.69f

0.245 ± 0.04g

14.56 ± 0.8f

3.83 ± 0.59g

2.69 ± 0.64fg

+NH₄⁺−P

77.87 ± 7.7a

219.3 ± 36.1a

0.384 ± 0.04a

21.46 ± 2.6b

0.707 ± 0.06a

31.4 ± 3.9b

6.46 ± 0.80de

4.72 ± 0.68de

+NH₄⁺+P

21.66 ± 3.1cd

79.57 ± 9.8d

0.185 ± 0.02d

0.789 ± 0.14g

0.348 ± 0.1ef

9.83 ± 1.8g

4.24 ± 0.43fg

1.85 ± 0.48g

P values

Sex (S)

***

Nitrogen (N)

***

Phosphorus (P)

***

S × N

***

S × P

***

N × P

***

S × N × P

***

Table 2:

Open in new tab

Leaf CAT (U mg⁻¹ protein), POD (U g⁻¹ protein), SOD (U g⁻¹ protein), GR (U mg⁻¹), MDA (nmol g⁻¹ FW) and superoxide radical (O₂⁻, nmol g⁻¹ FW), and root CAT and GR in female and male Populus cathayana under nitrogen and phosphorus deficiency (−N−P), nitrate and P deficiency (NO₃⁻−P), ammonium and P deficiency (NH₄⁺−P), N deficiency and high P (−N+P), NO₃⁻ and high P (NO₃⁻+P) and NH4 and high P (NH₄⁺+P)

Sex	Treatment	Leaf CAT	Leaf POD	Leaf SOD	Leaf GR	Root CAT	Root GR	Leaf MDA	Leaf O₂⁻
Female	−N−P	14.99 ± 1.4de	27.12 ± 1.4e	0.213 ± 0.02cd	6.81 ± 1.1f	0.482 ± 0.04cd	35.51 ± 4.2b	12.12 ± 1.24b	16.32 ± 0.68a
	−N+P	21.80 ± 6.2cd	36.01 ± 4.4e	0.392 ± 0.06a	6.83 ± 0.40f	0.570 ± 0.04bc	20.87 ± 3.0de	15.44 ± 0.81a	11.77 ± 1.59b
	+NO₃⁻−P	26.79 ± 2.1c	15.86 ± 1.7e	0.353 ± 0.03a	11.00 ± 2.1e	0.484 ± 0.02cd	50.98 ± 3.1a	6.59 ± 0.38de	12.35 ± 1.66b
	+NO₃⁻+P	17.32 ± 2.5de	19.63 ± 2.5e	0.377 ± 0.04a	10.40 ± 1.34e	0.292 ± 0.05fg	32.18 ± 2.2b	4.78 ± 0.71fg	6.05 ± 0.75d
	+NH₄⁺−P	73.1 ± 10.13a	26.03 ± 4.5e	0.269 ± 0.03bc	17.49 ± 1.3c	0.412 ± 0.06de	26.42 ± 4.3c	8.44 ± 0.43c	8.94 ± 1.26c
	+NH₄⁺+P	10.09 ± 1.1e	19.90 ± 3.1e	0.394 ± 0.04a	14.53 ± 1.3d	0.489 ± 0.07cd	17.17 ± 2.1ef	4.46 ± 1.10fg	3.84 ± 0.56ef
Male	−N−P	56.03 ± 5.1b	175.09 ± 12.9b	0.414 ± 0.07a	14.44 ± 0.8d	0.354 ± 0.05ef	16.51 ± 1.93ef	7.38 ± 0.99cd	11.96 ± 0.60b
	−N+P	29.78 ± 2.4c	218.52 ± 28a	0.284 ± 0.04b	14.01 ± 0.93d	0.599 ± 0.03b	22.35 ± 2.6cd	8.35 ± 1.39c	8.76 ± 0.82c
	+NO₃⁻−P	58.98 ± 7.3b	222.99 ± 24.6a	0.286 ± 0.04b	29.54 ± 3.7a	0.410 ± 0.07de	24.3 ± 2.6cd	5.49 ± 0.29ef	5.13 ± 0.53de
	+NO₃⁻+P	22.16 ± 3.1cd	120.07 ± 9.7c	0.192 ± 0.03d	5.72 ± 1.69f	0.245 ± 0.04g	14.56 ± 0.8f	3.83 ± 0.59g	2.69 ± 0.64fg
	+NH₄⁺−P	77.87 ± 7.7a	219.3 ± 36.1a	0.384 ± 0.04a	21.46 ± 2.6b	0.707 ± 0.06a	31.4 ± 3.9b	6.46 ± 0.80de	4.72 ± 0.68de
	+NH₄⁺+P	21.66 ± 3.1cd	79.57 ± 9.8d	0.185 ± 0.02d	0.789 ± 0.14g	0.348 ± 0.1ef	9.83 ± 1.8g	4.24 ± 0.43fg	1.85 ± 0.48g
P values	Sex (S)	***	***	***	***	ns	***	***	***
	Nitrogen (N)	***	ns	***	***	**	***	***	***
	Phosphorus (P)	***	ns	***	***	***	***	***	***
	S × N	***	***	**	***	**	***	***	*
	S × P	***	***	***	***	*	**	ns	***
	N × P	***	ns	***	***	***	***	***	ns
	S × N × P	***	***	***	***	***	***	**	ns

Sex	Treatment	Leaf CAT	Leaf POD	Leaf SOD	Leaf GR	Root CAT	Root GR	Leaf MDA	Leaf O₂⁻
Female	−N−P	14.99 ± 1.4de	27.12 ± 1.4e	0.213 ± 0.02cd	6.81 ± 1.1f	0.482 ± 0.04cd	35.51 ± 4.2b	12.12 ± 1.24b	16.32 ± 0.68a
	−N+P	21.80 ± 6.2cd	36.01 ± 4.4e	0.392 ± 0.06a	6.83 ± 0.40f	0.570 ± 0.04bc	20.87 ± 3.0de	15.44 ± 0.81a	11.77 ± 1.59b
	+NO₃⁻−P	26.79 ± 2.1c	15.86 ± 1.7e	0.353 ± 0.03a	11.00 ± 2.1e	0.484 ± 0.02cd	50.98 ± 3.1a	6.59 ± 0.38de	12.35 ± 1.66b
	+NO₃⁻+P	17.32 ± 2.5de	19.63 ± 2.5e	0.377 ± 0.04a	10.40 ± 1.34e	0.292 ± 0.05fg	32.18 ± 2.2b	4.78 ± 0.71fg	6.05 ± 0.75d
	+NH₄⁺−P	73.1 ± 10.13a	26.03 ± 4.5e	0.269 ± 0.03bc	17.49 ± 1.3c	0.412 ± 0.06de	26.42 ± 4.3c	8.44 ± 0.43c	8.94 ± 1.26c
	+NH₄⁺+P	10.09 ± 1.1e	19.90 ± 3.1e	0.394 ± 0.04a	14.53 ± 1.3d	0.489 ± 0.07cd	17.17 ± 2.1ef	4.46 ± 1.10fg	3.84 ± 0.56ef
Male	−N−P	56.03 ± 5.1b	175.09 ± 12.9b	0.414 ± 0.07a	14.44 ± 0.8d	0.354 ± 0.05ef	16.51 ± 1.93ef	7.38 ± 0.99cd	11.96 ± 0.60b
	−N+P	29.78 ± 2.4c	218.52 ± 28a	0.284 ± 0.04b	14.01 ± 0.93d	0.599 ± 0.03b	22.35 ± 2.6cd	8.35 ± 1.39c	8.76 ± 0.82c
	+NO₃⁻−P	58.98 ± 7.3b	222.99 ± 24.6a	0.286 ± 0.04b	29.54 ± 3.7a	0.410 ± 0.07de	24.3 ± 2.6cd	5.49 ± 0.29ef	5.13 ± 0.53de
	+NO₃⁻+P	22.16 ± 3.1cd	120.07 ± 9.7c	0.192 ± 0.03d	5.72 ± 1.69f	0.245 ± 0.04g	14.56 ± 0.8f	3.83 ± 0.59g	2.69 ± 0.64fg
	+NH₄⁺−P	77.87 ± 7.7a	219.3 ± 36.1a	0.384 ± 0.04a	21.46 ± 2.6b	0.707 ± 0.06a	31.4 ± 3.9b	6.46 ± 0.80de	4.72 ± 0.68de
	+NH₄⁺+P	21.66 ± 3.1cd	79.57 ± 9.8d	0.185 ± 0.02d	0.789 ± 0.14g	0.348 ± 0.1ef	9.83 ± 1.8g	4.24 ± 0.43fg	1.85 ± 0.48g
P values	Sex (S)	***	***	***	***	ns	***	***	***
	Nitrogen (N)	***	ns	***	***	**	***	***	***
	Phosphorus (P)	***	ns	***	***	***	***	***	***
	S × N	***	***	**	***	**	***	***	*
	S × P	***	***	***	***	*	**	ns	***
	N × P	***	ns	***	***	***	***	***	ns
	S × N × P	***	***	***	***	***	***	**	ns

Bars represents means ± SE (n = 4). Different letters in the same column indicate significant differences (P < 0.05; Duncan’s test). The significance values of the three-way analysis of variance are shown as follows: ns = not significant; *0.01 < P ≤ 0.05; **0.001 < P ≤ 0.01; ***P ≤ 0.001.

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