Effects of changes in leaf properties mediated by methyl jasmonate (MeJA) on foliar absorption of Zn, Mn, and Fe

This study highlights the potential importance of the combined thickness of the cuticle and epidermal cell wall in the absorption of foliar-applied nutrients.
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The mechanisms for the foliar absorption of nutrients are poorly understood, and it has been suggested that leaf properties could potentially have impact upon the foliar absorption of nutrients.

Zn, Mn, and Fe distribution (after 6h of foliar application) in control leaf of soybean (A) and tomato (C), and 1 mM methyl jasmonate (MeJA)-treated leaf of sunflower (B).
Zn, Mn, and Fe distribution (after 6h of foliar application) in control leaf of soybean (A) and tomato (C), and 1 mM methyl jasmonate (MeJA)-treated leaf of sunflower (B). In each image, the upper images are light microscopy before μ-XRF analysis, with the orange rectangle indicating the area examined by μ-XRF. The images below are tricolour μ-XRF maps of Zn (red), Mn (green) and Fe (blue) distribution.

Using methyl jasmonate (MeJA) to alter leaf properties, Cui et al. utilize traditional analytical approaches in addition to synchrotron-based X-ray fluorescence microscopy to investigate the absorption of foliar-applied Zn, Mn, and Fe in sunflower (Helianthus annuus), tomato (Solanum lycopersicum), and soybean (Glycine max). They find that the combined thickness of cuticle and epidermal cell wall plays an important role in influencing the absorption of foliar-applied nutrients.

Reference

Li, C., Wang, P., Menzies, N. W., Lombi, E., & Kopittke, P. M. (2017). Effects of changes in leaf properties mediated by methyl jasmonate (MeJA) on foliar absorption of Zn, Mn and Fe. Annals of Botany, 120(3), 405–415. https://doi.org/10.1093/aob/mcx063


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