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Nitrate reductase activity (A) and activation state (B) of shoots from maize (Zea mays L.) plants hydroponically grown in control (10 mM NO3 -, high N) and stress (1 mM NO3 -, low N) nitrogen conditions with (black bars) and without 1 µM omeprazole (OP) (white bars). Data are means ± SD; n = 3 biological replicates for each treatment. Asterisks denote significant differences (*, P < 0.05; **, P < 0.01) between different OP treated plants.
