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Type: Journal article
Title: In situ analysis of foliar zinc absorption and short-distance movement in fresh and hydrated leaves of tomato and citrus using synchrotron-based X-ray fluorescence microscopy
Author: Du, Y.
Kopittke, P.
Noller, B.
James, S.
Harris, H.
Xu, Z.
Li, P.
Mulligan, D.
Huang, L.
Citation: Annals of Botany, 2015; 115(1):41-53
Publisher: Oxford University Press
Issue Date: 2015
ISSN: 0305-7364
Statement of
Yumei Du, Peter M. Kopittke, Barry N. Noller, Simon A. James, Hugh H. Harris, Zhi Ping Xu, Peng Li, David R. Mulligan and Longbin Huang
Abstract: BACKGROUND AND AIMS: Globally, zinc deficiency is one of the most important nutritional factors limiting crop yield and quality. Despite widespread use of foliar-applied zinc fertilizers, much remains unknown regarding the movement of zinc from the foliar surface into the vascular structure for translocation into other tissues and the key factors affecting this diffusion. METHODS: Using synchrotron-based X-ray fluorescence microscopy (µ-XRF), absorption of foliar-applied zinc nitrate or zinc hydroxide nitrate was examined in fresh leaves of tomato (Solanum lycopersicum) and citrus (Citrus reticulatus). KEY RESULTS: The foliar absorption of zinc increased concentrations in the underlying tissues by up to 600-fold in tomato but only up to 5-fold in citrus. The magnitude of this absorption was influenced by the form of zinc applied, the zinc status of the treated leaf and the leaf surface to which it was applied (abaxial or adaxial). Once the zinc had moved through the leaf surface it appeared to bind strongly, with limited further redistribution. Regardless of this, in these underlying tissues zinc moved into the lower-order veins, with concentrations 2- to 10-fold higher than in the adjacent tissues. However, even once in higher-order veins, the movement of zinc was still comparatively limited, with concentrations decreasing to levels similar to the background within 1-10 mm. CONCLUSIONS: The results advance our understanding of the factors that influence the efficacy of foliar zinc fertilizers and demonstrate the merits of an innovative methodology for studying foliar zinc translocation mechanisms.
Keywords: Nutrient absorption; foliar zinc application; short-distance nutrient transport; veins; X-ray fluorescence microscopy; XRF; Zn movement; crop nutrition; tomato; Solanum lycopersicum; Citrus reticulatus
Rights: © The Author 2014 . Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.
DOI: 10.1093/aob/mcu212
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