The appearance of J limitation could occur in this type of analysis if, for example, photosynthesis in plants in the field were reduced at the operational Ci by high water vapor pressure deficit or by midday water stress compared with excised leaves indoors.
The data presented here indicated that the type of system for growing plants at elevated CO2, FACE or OTC, did not affect the biochemical factor limiting photosynthesis at elevated CO2, when the same cultivars were compared in the same location