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. 2019 May 24;10:597. doi: 10.3389/fpls.2019.00597

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Copyright © 2019 Torralbo, González-Moro, Baroja-Fernández, Aranjuelo and González-Murua.

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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Nitrate reductase (A), glutamine synthetase (B) and aminating glutamate dehydrogenase (C) activities in leaves of wheat plants under ambient (400 ppm CO₂, grey bars) and elevated (700 ppm CO₂, black bars) CO₂ conditions. Significant differences (p < 0.05) between N treatments and CO₂ conditions are indicated with different letters. Values represent mean ± SEM (n = 4).