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Oxygen concentrations measured in water and in leaf meristem, internode 3 and internode 4 of Z. marina exposed to a stepwise reduction of O2 concentrations in the water column in the dark. The inset is a close-up of the O2 dynamics and the time delay of O2 reduction in the aerenchyma following a sudden reduction of O2 concentration in the water column. The time delay was calculated by linear extrapolation back to the initial O2 concentration.
