Table 3.

Effects of ambient CO₂ concentration (400 μmol mol⁻¹) and elevated CO₂ concentration (800 μmol mol⁻¹) treatments on the levels of carbon and nitrogen and their ratio in the leaves and seeds of full flowering leaves. The asterisk indicates a significant difference between ambient and elevated CO₂ treatments (P < 0.05). Data are the mean ± S.D. (n = 6).

	Tissue	Ambient	Elevated	Relative change (%)
C (g/kg)	leaves	454.83 ± 0.41	447.83 ± 2.04*	−1.54
	seeds	501.33 ± 1.86	499.00 ± 1.41*	−0.46
N (g/kg)	leaves	35.13 ± 1.89	26.46 ± 4.00*	−24.68
	seeds	68.23 ± 1.32	69.33 ± 0.85	1.61
C/N	leaves	12.98 ± 0.73	17.26 ± 2.66*	32.97
	seeds	7.35 ± 01.6	7.20 ± 0.10	−2.04