Figure 4.

Comparison of the effects of oxygen on the steady-state isoprene emission in the light, on the maximum dark-induced emission rate, and on dark respiration rate (A), and the oxygen dependencies of the DMADP and dark pool sizes (B). Leaf temperature was maintained at 33°C and CO₂ concentration at 360 μmol mol⁻¹, and the quantum flux density was 600 μmol m⁻² s⁻¹ before the transient. Definitions of terms are as in Figure 2. Data are averages ± sd of at least four replicate experiments.