Table 5 Mean percentage of spikelet and spikelet weight per spikelet at each position (primary, secondary, tertiary, and quaternary) in the panicles as affected by different CO2 concentrations and genotype averaged for two years (2012 and 2013).

From: Quantitative trait loci for large sink capacity enhance rice grain yield under free-air CO2 enrichment conditions

CO2 concentration

Genotype

Percentage of spikelet

Spikelet weight

Primary (%)

Secondary (%)

Tertiary (%)

Quaternary (%)

Primary (mg spikelet−1)

Secondary (mg spikelet−1)

Tertiary (mg spikelet−1)

Quaternary (mg spikelet−1)

CO2 concentration (C)

FACE

 

6.7

52.8

40.4

0.0

24.6

23.6

18.7

0.3

Ambient

 

6.9

53.6

39.6

0.0

23.9

23.3

15.5

0.0

Genotype (G)

 

Koshihikari

7.7a†

57.5a

34.8b

0.0

24.7a

24.5a

19.2a

0.0

 

CSSL-GN1

6.2b

50.5b

43.3a

0.0

23.6b

21.9b

14.3b

0.0

 

NIL-APO1

6.6b

51.5b

41.9a

0.1

24.5a

24.0a

17.8a

0.5

C × G

FACE

Koshihikari

7.7

57.6

34.7

0.0

25.6aA‡

25.1

21.5

0.0

 

CSSL-GN1

6.0

49.8

44.2

0.0

23.3b

21.8

15.1

0.0

 

NIL-APO1

6.5

51.0

42.5

0.1

24.8a

24.0

19.4

1.0

Ambient

Koshihikari

7.7

57.4

34.8

0.0

23.8B

23.9

16.9

0.0

 

CSSL-GN1

6.3

51.3

42.5

0.0

23.9

22.1

13.4

0.0

 

NIL-APO1

6.7

52.1

41.3

0.0

24.1

24.1

16.1

0.0

ANOVA

CO2 concentration (C)

NS¶

NS

NS

NS

NS

NS

*

NS

Genotype (G)

**

**

**

NS

§§

*

*

NS

C × G

NS

NS

NS

NS

§

NS

NS

NS

  1. *Significant at P < 0.05. **Significant at P < 0.01. †Means within a column followed by the same lowercase letter do not differ significantly (P < 0.05). ‡Means within a column followed by the same lowercase letter do not differ significantly (P < 0.05) among genotypes for a given CO2 concentration. Means within a column followed by the same uppercase letter do not differ significantly (P < 0.05) between CO2 concentrations for a given genotype. §Significant at P < 0.10. ¶Not significant at P < 0.10.
Back to article page