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Table 1 Biomass of four tissues and whole plants of two cultivars (IIY084 and WYJ23) subjected to ambient (A) and elevated [CO2] (F) at none (0N) and normal N levels (NN) at three stages

From: Effects of free-air CO2 enrichment (FACE) and nitrogen (N) supply on N uptake and utilization of indica and japonica cultivars (Oryza sativa L.)

Growth stage

N level

Cultivar

CO2

Biomass (g hill−1)

Panicle

Leaf

Stem

Root

Whole plant

82 DAT

0N

IIY084

A

10.7 ± 1.8 ab

7.1 ± 0.7

18.6 ± 1.5 c

3.5 ± 0.5 b

39.9 ± 4.3

F

8.5 ± 0.7 bc

8.7 ± 1.0

25.3 ± 3.0 ab

3.7 ± 0.1 b

46.3 ± 4.7

WYJ23

A

5.1 ± 1.2 d

9.0 ± 0.6

20.7 ± 0.9 abc

3.4 ± 0.5 b

38.3 ± 2.6

F

7.4 ± 0.1 bcd

7.7 ± 0.7

19.5 ± 1.8 bc

4.0 ± 0.7 b

38.6 ± 2.8

NN

IIY084

A

12.7 ± 1.5 a

15.2 ± 0.9

25.1 ± 0.5 abc

3.8 ± 0.2 b

56.7 ± 2.7

F

12.3 ± 0.3 a

15.5 ± 3.2

26.3 ± 0.4 a

5.4 ± 0.6 a

59.6 ± 3.0

WYJ23

A

6.3 ± 0.7 cd

13.5 ± 1.7

22.1 ± 3.0 abc

4.1 ± 0.5 b

46.0 ± 5.1

F

8.8 ± 0.9 bc

14.9 ± 1.6

27.1 ± 2.5 a

5.8 ± 0.2 a

56.6 ± 5.1

99 DAT

0N

IIY084

A

31.5 ± 3.5 ab

7.9 ± 1.2

16.2 ± 2.0

4.8 ± 0.4 bc

60.1 ± 6.5 ab

F

28.9 ± 5.2 abc

6.7 ± 1.4

19.5 ± 1.8

6.0 ± 0.3 ab

61.8 ± 7.3 ab

WYJ23

A

19.6 ± 4.4 cd

7.6 ± 0.9

16.9 ± 2.1

4.6 ± 0.5 bc

49.0 ± 8.1 b

F

23.7 ± 3.7 bcd

7.4 ± 0.6

16.6 ± 4.2

4.9 ± 1.0 bc

51.8 ± 10.3 b

NN

IIY084

A

29.1 ± 0.1 abc

13.0 ± 1.4

18.7 ± 1.0

3.85 ± 0.1 c

64.6 ± 2.5 ab

F

37.2 ± 2.8 a

13.9 ± 0.5

26.1 ± 2.7

5.04 ± 0.3 bc

82.3 ± 5.7 a

WYJ23

A

16.4 ± 2.6 d

14.2 ± 1.3

23.3 ± 2.0

6.07 ± 0.6 ab

60.0 ± 5.0 ab

F

30.8 ± 3.6 abc

14.7 ± 1.8

25.9 ± 2.1

7.12 ± 0.5 a

78.5 ± 8.0 a

Maturity

0N

IIY084

A

41.7 ± 4.2

6.1 ± 0.4 bc

18.0 ± 1.4 bc

3.1 ± 0.2

68.9 ± 6.2

F

34.9 ± 4.1

4.4 ± 0.5 c

15.8 ± 1.7 c

3.2 ± 0.5

58.3 ± 6.0

WYJ23

A

32.7 ± 2.0

6.6 ± 0.8 b

17.3 ± 2.1 bc

3.9 ± 0.4

60.5 ± 5.1

F

37.5 ± 6.7

5.9 ± 1.0 bc

18.2 ± 2.6 bc

4.7 ± 0.8

66.4 ± 11.0

NN

IIY084

A

38.7 ± 1.3

11.7 ± 0.4 a

21.7 ± 1.1 ab

3.3 ± 0.5

75.3 ± 7.2

F

48.4 ± 2.4

12.6 ± 0.5 a

25.5 ± 0.6 a

4.2 ± 0.3

90.7 ± 3.0

WYJ23

A

37.8 ± 3.1

11.3 ± 0.9 a

20.0 ± 1.1 bc

4.1 ± 0.4

73.2 ± 5.2

F

43.0 ± 1.5

11.5 ± 0.3 a

20.2 ± 0.9 bc

4.9 ± 0.3

79.7 ± 2.2

  1. Different letters in each column represent significant differences in each tissue among eight treatments at each sampling date according to LSD at 5% level