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. 2015 Jan 21;5:808. doi: 10.3389/fpls.2014.00808

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Copyright © 2015 Tian, Lu, Xie, Zhang, Jernstedt, Hou, Ramsier and Brown.

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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Microscope cross sections (a–f) and μ-XRF elemental maps (A–F) for Zn (red), Ca (green), and K (blue) of petioles collected from sunflowers subject to different foliar fertilizers. Cross-sections of leaf veins were cut from sunflower plants treated with (a, A) control, (b, B) CleanStart, (c, C) Kick-Off, (d, D) CleanStart + Kick-Off, (e, E) CleanStart + Kick-Off + GroZyme, and (f, F) ZnSO₄, and then analyzed by μ-XRF imaging. Compositions of the nutrients in different treatments are shown in Table 1. Pixel brightness for μ-XRF map (A–F) is displayed in RGB, with the brightest spots corresponding to the highest element fluorescence. Scale bar: 500 μm.