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. 2016 May 9;7:615. doi: 10.3389/fpls.2016.00615

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Copyright © 2016 Li, Ahammed, Li, Bao, Yu, Huang, Yin and Zhou.

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) or licensor 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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Response of antioxidant enzymes to individual or combined treatment of brassinosteroid and zinc oxide nanoparticles (ZnO NPs). (A) Superoxide dismutase (SOD), (B) Catalase (CAT), (C) Ascorbate peroxidase (APX), and (D) Glutathione reductase (GR) activity in tomato roots after 15 days treatment. Tomato seeds after sprouting were placed on ½ MS medium containing 5 nM 24-epibrassinolide (BR) and/or 10 and 50 mg/L ZnO NPs (NP10 and NP50, respectively) and cultured for 15 days before the analysis of activities of antioxidant enzymes. The data shown here are the averages of four replicates, with the standard errors indicated by the vertical bars. The means denoted by the same letter did not significantly differ at a P < 0.05, according to Tukey’s test.