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. 2022 Jul 18;13:910714. doi: 10.3389/fpls.2022.910714

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Copyright © 2022 Mir, Alam and Hayat.

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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(I) Scanning electron microscope (SEM) images of stomata in 45 day-old leaves of Brassica juncea (L.) cv. Varuna raised with Cu and/or sprayed with melatonin (MEL) at 3,000× magnification. (A) Control, (B) Cu 60 mg kg^–1, (C) MEL 40 μM, (D) Cu 30 + MEL (40 μM), and (E) Cu 60 + MEL (40 μM). (II) Transmission electron microscope (TEM) images of chloroplast in 45 day-old B. juncea (L.) cv. Varuna raised with Cu and/or sprayed with MEL. (A) Control, (B) Cu 60 mg kg^–1, (C) MEL 40 μM, (D) Cu 30 + MEL (40 μM), and (E) Cu 60 + MEL (40 μM). CP, chloroplast; T, thylakoid; P, plastoglobuli; G, omniferous granules; W, cell wall.