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. 2018 Apr 24;9:531. doi: 10.3389/fpls.2018.00531

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Copyright © 2018 Dechorgnat, Francis, Dhugga, Rafalski, Tyerman and Kaiser.

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 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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Gene expression in B73 (white) and F44 (black) roots. (A) Expression of nitrogen transporter genes. (B) Expression of nitrogen metabolism pathway genes. Values are means (±SE) from three individual plants. Similar results were obtained in another independent experiment. Asterisks indicate significant differences between lines at ^∗P < 0.05, ^∗∗P < 0.01, ^∗∗∗P < 0.005 (Student’s t-test). NPF/NRT, nitrate transporter; AMT, ammonium transporter; AMF, ammonium facilitator; GLN, glutamine synthetase; NIA, nitrate reductase; NIR, nitrite reductase; AsnS, asparagine synthetase; GOGAT, glutamate synthase; GDH, glutamate dehydrogenase; n.d., non-detectable.