Leaf O₂ uptake in the dark is independent of coincident CO₂ partial pressure

Elevated CO₂, in the dark, is sometimes reported to inhibit leaf respiration, with respiration usually measured as CO₂ efflux. Oxygen uptake may be a better gauge of respiration because non-respiratory processes can affect dark CO₂ efflux in elevated CO₂. Two methods of quantifying O₂ uptake indicated that leaf respiration was unaffected by coincident CO₂ level in the dark.