Using multirate rapid A/C curves as a tool to explore new questions in the photosynthetic physiology of plants.

Steady-state photosynthetic CO responses (A/C curves) are used to assess environmental responses of photosynthetic traits and to predict future vegetative carbon uptake through modeling. The recent development of rapid A/C curves (RACiRs) permits faster assessment of these traits by continuously changing [CO ] around the leaf, and may reveal additional photosynthetic properties beyond what is practical or possible with steady-state methods. Gas exchange necessarily incorporates photosynthesis and (photo)respiration.