Table 2.

Leaf photosynthetic traits estimated on gdch-KD and WT plants under approximately current ambient and below current ambient O₂ levels (pO₂ of 18.4 kPa and 1.84 kPa, respectively) at C_a of 27.6 Pa.

Plant-type	pO2	A	g sC	C i	C i /C a	g m a	C c	Δo
	(kPa)	(µmol CO2 m−2 s−1)	(µmol CO2 m−2 s−1 Pa−1)	(Pa)		(µmol CO2 m−2 s−1 Pa−1)	(Pa)	(‰)
gdch-KD	1.84	24.7±1.4	3.47±0.53	18.1±0.8	0.66±0.03	4.56±0.43	12.6±1.4	14.9±0.7
	18.4	6.3±0.3	1.37±0.11	22.1±0.2	0.80±0.01		20.6±0.2	23.7±0.5
WT	1.84	21.6±1.2	2.78±0.43	18.5±0.9	0.67±0.03	3.80±0.76	12.6±0.5	14.3±0.8
	18.4	14.3±0.8	2.45±0.31	20.5±0.5	0.74±0.02	4.07±0.14	17.0±0.6	17.8±0.3
Significance	Plant type	P=0.050	P=0.629	P=0.411	P=0.411	–	P=0.031	P=0.003
	pO2	P<0.001	P=0.018	P=0.003	P=0.003	–	P=0.000	P<0.001
	Plant type×pO2	P=0.002	P=0.057	P=0.171	P=0.171	–	P=0.033	P=0.003

Values are the mean±SE (n=4). Significance (P<0.05) of the effects of plant type, pO₂, and plant type×pO₂ interaction were evaluated by SAS PROC MIXED.

^a No significant differences were evaluated by a two sample t-test (significance for P<0.05) between the gdch-KD and WT g_m values at a pO₂ of 1.84 kPa (P=0.586), and the WT g_m values at the two pO₂ values (P=0.701).