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. 2017 Dec 19;17:247. doi: 10.1186/s12870-017-1207-z

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Leaves of tobacco seedlings without (a and c) or with (b and d) exogenous trehalose under control (a and b) or nitrogen deficient (c and d) conditions. Chlorophyll content (e) and photosynthesis rate (f) of the youngest fully expanded leaf. Pictures and data were obtained from seedlings (45 days old) after treatment for 15 days as indicated except (d). Values represent the mean ± SE of 5 individual plants. Within each set of experiments, the different letters indicate significant differences (P < 0.05)