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. 2015 Dec 22;5(1):1. doi: 10.3390/plants5010001

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Changes in the amounts of soluble proteins and amino acids in the source leaves in response to restricted (LN, 0.375 mM) or ample (HN, 3.75 mM) nitrate applied for 21 days. The amounts of soluble proteins and ¹⁵N, estimated in HN (a,c) and LN (b,d) conditions, are expressed as mg·leaf⁻¹ and µmol·leaf⁻¹, respectively. The percentage between brackets corresponds to the remobilization of soluble proteins and amino acids at D21 as a percentage of the initial level (D0). D0: day 0; D14: day 14; D21: day 21. Data are expressed as the mean ± standard error (SE). For each genotype, the statistical differences in kinetics are indicated by letters a, b, c and a difference between N treatments is indicated by an asterisk (n = 3, p < 0.05).