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A, Example calibration information: relationships between net CO2 assimilation rate (A), Fq′/Fm′ (PSII quantum efficiency), and intercellular CO2 concentration (Ci) for P. vulgaris. PPFD 400 μmol m−2 s−1; leaf temperature = 25°C; 1% O2. Insert graph in A is data replotted as A versus Fq′/Fm′. B, Data from A replotted as the double reciprocal plot, 1/Ci against Fm′/Fq′.
