Figure 5.

Representative CRDS and PTR-MS time series plot showing ¹³C-labeling of photorespiratory CO₂ and isoprene during 10 mm [2-¹³C]Gly feeding of a detached shimbillo branch through the transpiration stream under constant light (300–500 µmol m^–2 s^–1 PAR) and air temperature (28°C–30°C). The detached branch was first placed in water and then transferred to the [2-¹³C]Gly solution for 4 h before being replaced in water. ppbv, Parts per billion by volume.