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(A, B) Seasonal change in the activation energy of Jmax (Eaj), and (C, D) activation energy of Vcmax (Eav) for rice grown at ambient CO2 (370 µmol mol−1) and at elevated CO2 (570 µmol mol−1) in 2003 (A, C) and 2004 (B, D). One point denotes one plot.
