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Fig. S1 Spatial distribution of 11CO2 for the first 18 s after introduction into the labeling chamber with the instrument fans turned off.

Fig. S2 Spatial distribution of 11CO2 for the first 11 s after introduction into the labeling chamber with the instrument fans turned on.

Fig. S3 11CO2 and 13CO2 concentrations in the labeling chamber as a function of time for the leaf of Fig. 6.

Fig. S4 11CO2 and 13CO2 concentrations in the labeling chamber as a function of time for the water-stressed leaf of Fig. 7.

Fig. S5 11CO2 and 13CO2 concentrations in the labeling chamber as a function of time for the water-stressed leaf of Fig. 8.

Fig. S6 Movement of photosynthate in a soybean trifoliolate labeled with 600 ppm 13CO2 spiked with 5.25 mCi 11CO2 under low-light conditions.

Fig. S7 Time evolution of 11C photosynthate in a soybean trifoliolate exposed to low-intensity light and 200 or 600 ppm CO2.

Fig. S8 Detection of 13C-15N peptide bonds by solid-state nuclear magnetic resonance (NMR). 125-MHz 16-rotor-period 13C{15N} rotational-echo double resonance (REDOR) spectra are shown of two soybean cultivars labeled for 1 h with 13CO2 at 200 and 600 ppm under full sunlight.

Fig. S9 Determination of leaf 15N isotopic enrichment by solid-state nuclear magnetic resonance (NMR). 125-MHz 16-rotor-period 13C{15N} rotational-echo double resonance (REDOR) spectra are shown of a soybean leaf labeled for 1 h with 13CO2 at 400 ppm under full sunlight.

Fig. S10 Solid-state nuclear magnetic resonance (NMR) characterization of the inhibition of peptide-bond formation in a nitrogen-starved soybean leaf.

Fig. S11 Solid-state nuclear magnetic resonance (NMR) characterization of the effect of Amersham NCS tissue solubilizer (GE Healthcare Ltd., Little Chalfont, UK) on isolated soybean cell walls.

Notes S1 Labeling chamber and 11C detection.

Notes S2 Solid-state 13C nuclear magnetic resonance (NMR) applied to plant science.