TABLE 2.

Mean initial slopes calculated from the A/Ci curves for the four genotypes grown at three different CO₂ concentrations. Slopes were from linear regressions fitted to the first 3-4 points on each A/Ci curve. Values are means of the 16th leaf from four different plants for each genotype ± one standard deviation. A two-factor ANOVA (growth CO₂ concentration x genotype) was highly significant (p < 0.01) for both growth CO₂ concentration and genotype.

Growth CO2	Genotype
	WT	αca2	βca4	αca2βca4
200 μL L–1	0.047 ± 0.013	0.047 ± 0.011	0.042 ± 0.002	0.028 ± 0.011
400 μL L–1	0.055 ± 0.007	0.059 ± 0.006	0.049 ± 0.003	0.044 ± 0.007
1,000 μL L–1	0.057 ± 0.005	0.058 ± 0.015	0.051 ± 0.014	0.049 ± 0.002