Figure 5.

Example of [¹³C₂]acetate labeling of a detached branch of I. edulis showing real-time [¹³C]labeling dynamics of C₁ and C₂ volatile metabolites using PTR-MS (absolute emissions in (a) and relative emissions in (b)). ¹³CO₂ emission analysis of the dynamic headspace atmosphere are also shown based on CRDS. Vertical dashed line indicates a rapid change of solutions delivered to the transpiration stream (i.e., water to [¹³C₂]acetate). Note: despite a strong labeling of CO₂ emissions, significant labeling of methanol and formaldehyde emissions were not observed (data not shown).