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Figure 2
Net CO2 consumption (A) and O2 evolution (B) by the shoot of a wheat seedling as a function of internal CO2 concentration (Ci), estimated from changes in CO2 and water vapor concentrations. The plants were grown in controlled environment chambers at 360 (red or gold symbols) or 700 (blue or cyan symbols) µmol mol–1 CO2 . During measurements, the plants were exposed to NH4+ (circles) and then to NO3– (triangles). The PFD at plant height was 1200 µmol quanta m–2 s–1 . Shown are mean ± SE for 6 replicate plants.
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