Figure 6.

Representative CRDS and PTR-MS time series plots showing the influence of increasing leaf temperature on absolute emissions of photorespiratory ¹³CO_2, [¹²C]isoprene, and [¹³C_1–5]isoprene from detached shimbillo leaves in a 10 mm [2-¹³C]Gly solution under 50 ppmv ¹²CO₂ (A) and 150 ppmv ¹²CO₂ (B). Also shown are the relative emissions (percentage of total) of [¹²C]isoprene and [¹³C_1–5]isoprene. Note the general pattern of increasing relative emissions of [¹³C_1–4]isoprene and a decrease in [¹²C]isoprene with temperature.