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. 2016 Mar 4;7:224. doi: 10.3389/fpls.2016.00224

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Copyright © 2016 Mesquita, Zambrosi, Tanaka, Boaretto, Quaggio, Ribeiro and Mattos.

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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Cross sections of leaves under light microscopy (LM) and scanning electron microscopy (SEM) of sweet orange trees grafted on Swingle (LM: A–C; SEM: G–I) or Sunki (LM: D–F; SEM: J–L) rootstocks grown in nutrient solution with varying concentrations of B for 130 days. Concentration of nutrient solution, in mg L^-1 of boron: left (0.01), center (0.5), and right (5.0) columns. Legend: PP, palisade parenchyma; SP, spongy parenchyma; XL, xylem; PL, phloem; GF, gelatinous fibers; LW, leaf wax; GC, guard cell; arrowhead: ostiole.