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Flooding-induced changes in photosynthesis and oxidative status in maize plants

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Maize plants (Zea mays L.) were subjected to soil flooding for 72, 96, and 120 h. A noticeable decrease in the rate of net photosynthesis (PN) and the activity of ribulose-1,5-bisphosphate carboxylase (RuBPC, EC were observed. The values of intercellular CO₂ concentrations (ci) increased in all flooded plants without significant changes in stomatal conductance (gs). The activity of phosphoenolpyruvate carboxylase (PEPC, EC increased twofold 120 h after soil flooding. Flooding of maize plants led to a decrease in chlorophyll and protein levels and to slight increase of proline content. Flooded plants exhibited a large accumulation of leaf acidity. An increase in the values of some important parameters associated with oxidative stress, namely peroxides production, lipid peroxidation, and electrolyte leakage, confirmed the suggestion that root oxygen deficiency caused photooxidative damage in maize leaves.
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