. 2020 Jul 25;72(1):137–152. doi: 10.1093/jxb/eraa343

Table 2.

Comparison of photosynthesis parameters.

	QE (µmol CO₂ m⁻² s⁻¹ µmol photons mol⁻¹)	R _d (µmol CO₂ m⁻² s⁻¹)	Γ (µmol CO₂ m⁻² s⁻¹)	CE (µmol CO₂ m⁻² s⁻¹ µmol CO₂ mol⁻¹)	Γ (µmol CO₂ m⁻² s⁻¹)	CE (µmol CO₂ m⁻² s⁻¹ µmol CO₂ mol⁻¹)
			21% O₂		2% O₂
Wild type	0.05±0.003ns	0.42±0.26 a	54.86±5.23 b	0.12±0.01 a	13.72±1.93 ns	0.23±0.013 a
OMT1-79	0.043±0.003ns	0.93±0.20 ab	64.55±3.47 b	0.08±0.01 bc	17.89±4.76 ns	0.12±0.02 b
OMT1-80	0.047±0.002ns	0.41±0.21 a	53.81±3.17 b	0.11±0.01 ab	22.63±0.8 ns	0.22±0.2 a
OMT1-87	0.037±0.011ns	1.06±0.12 b	67.9±7.23 a	0.07±0.02 c	12.55±6.54 ns	0.17±0.05 ab

Measurements of quantum efficiency (QE) were made at 400 µmol CO₂ mol⁻¹ and a leaf temperature of 30 °C. Values represent the mean ±SEM of two leaves from four individual T₄ generation plants. Measurements of dark respiration rate (R_d) were made on leaves dark adapted for 1100 s. Values represent the mean ±SEM of measurements made every 10 s for 100 s from two leaves of four individual T₄ generation plants. Measurements of CO₂ compensation point (Γ) and carboxylation efficiency (CE) were made at a photosynthetic photon flux density (PPFD) of 2000 µmol photons m⁻² s⁻¹ and a leaf temperature of 30 °C at either 21% or 2% O₂. Values represent the mean ±SEM of two leaves of four individual T₄ generation plants. Different letters within groups indicate that values are statistically different P≤0.05, Tukey’s multiple comparison test. ns indicates non-significant, P>0.05.