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. 2019 Dec 4;10:1507. doi: 10.3389/fpls.2019.01507

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Copyright © 2019 Van Oosten, Dell’Aversana, Ruggiero, Cirillo, Gibon, Woodrow, Maggio and Carillo

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Biometrics and SPAD index of maize 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). (A) FW of shoots, (B) DW of shoots, (C) FW of roots, (D) DW of roots, (E) SPAD index, and (F) leaf area. Data are means ± s.d.; n = 6 and 20 plants for each treatment for biometric and SPAD measurements, respectively. Asterisks denote significant differences (*, P < 0.05; ***, P < 0.001) between untreated controls and OP treated plants.