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. 2023 Aug 31;14:1220109. doi: 10.3389/fpls.2023.1220109

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Copyright © 2023 Chen, Yin, Zhu, Song and Ding

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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Morphological structures of tobacco roots, stems and leaves, observed with an optical microscope, after root irrigation (A, C, E) and spraying (B, D, F) with to Mo NPs. The pictures labeled 1 and 2 on the right show the partial magnification of stems in (C) and the pictures labeled 3 and 4 show the partial magnification of roots in (D). Cross-sections of tissues from the same position of seedlings treated for 25 days were used for this assay. Ca, catheter; Co, cortex; Ep, epidermis; Fi, fibers; Pa, palisade tissue; Ph, phloem; Pi, pith; St, sieve tube; Va, vascular bundle; Ve, vein; Xy, xylem;.