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Oxygen concentrations in leaf meristem of Z. marina (same data as in Fig. 3). (A) Measured during the afternoon as a function of irradiance. The dashed horizontal line shows the air-saturated value. (B) Measured during the night as a function of oxygen concentrations in the overlying water (data are shown for different individual plants). The straight lines are linear extrapolations to zero oxygen in the meristem.
