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. 2019 Jan 10;9:1984. doi: 10.3389/fpls.2018.01984

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Copyright © 2019 Barabasz, Palusińska, Papierniak, Kendziorek, Kozak, Williams and Antosiewicz.

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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Zinc concentration in tobacco plants. Plants were grown in the quarter-strength Knop’s medium (control) and then transferred to the control medium supplemented with 50 μM Zn for 1 day (Zn excess), or to the medium without Zn for 4 days (Zn deficit). Results are demonstrated as percent of the control values: Zn concentration at control conditions equals 100%, and at Zn excess and Zn deficit is shown as multiple of values for the control ones. Zn concentrations [mg/kg dry weight] at control conditions is given above the control bars. (A) Zn excess – 50 μM Zn; (B) Zn deficit. Values correspond to means ± SD (n = 10). Significant differences between the control plants and plants exposed to a given Zn concentration (Zn excess or Zn deficit) are marked by different letters – evaluated by Student’s t-test (P ≤ 0.05).