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Xanthophyll-cycle carotenoids pool (V+A+Z) normalized to the total chlorophyll content or the total carotenoid content ([V+A+Z]/chl, ▴; [V+A+Z]/car, ▪) as a function of the PSII excitation pressure (V) obtained by varying the PFD in air (closed symbols) or by decreasing the CO2 and O2 content of the atmosphere (70 μg mL−1 CO2 and 10% O2, 750 μmol m−2 s−1, open symbols). The data were calculated from the data of Table I.
