Figure 6.

Net CO₂ exchange in expanding (30- to 40-d-old) soybean fruits (A) calculated from measurements of ¹³CO₂ uptake (B) and ¹²CO₂ production (C) in the dark and in the light (1,000 μmol m⁻² s⁻²). Each line represents a replicate assay involving five whole fruits, and the pod walls and seeds from the same five fruits. Data were corrected for specific activity of ¹²CO₂ and ¹³CO₂. Ambient CO₂ was constant throughout a run but varied from 813 to 890 μL L⁻¹ between tissues measured. Shaded areas indicate dark conditions.