Table I.

Net CO₂ assimilation rate (A), stomatal conductance to water vapor (g_s), the ratio of intercellular to ambient CO₂ (p_i/p_a), in vitro PEPC activity, and carbon isotope composition of leaf dry matter (δ¹³C)

Three different progeny were measured for each transgenic line and n = 4 for wild type. Gas-exchange measurements were made at external CO₂ of 350 μbar, 2,000 μmol quanta m⁻² s⁻¹, and a leaf temperature of 28°C. PEPC activities were made as described in Figure 4 and are the rates obtained in the absence of malate. n.d., Not determined.

Genotype	μmol m−2 s−1	gs (H2O) mol m−2 s−1	pi/pa	PEPC Activity μmol m−2 s−1	δ13C
Wild type (light)	38.7 ± 0.9	0.6 ± 0.08	0.6 ± 0.02	124 ± 5.6	−15.7 ± 0.14
Wild type (dark)	n.d.	n.d.	n.d.	96 ± 54.2	n.d.
R111a#3	39.5 ± 1.63	0.85 ± 0.25	0.66 ± 0.05	124 ± 6.9	−15.8 ± 0.17
R17#1	40.00 ± 0.87	0.84 ± 0.12	0.67 ± 0.03	112 ± 3.1	−15.1 ± 0.07
A47b#6	39.3 ± 0.3	0.7 ± 0.15	0.62 ± 0.07	131 ± 3.5	−15.1 ± 0.19