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- W4285147321 abstract "Foliar fertilization is a potential tool to increase the use-efficiency of nitrogen (N) fertilizers. However, whilst leaf scorching has frequently been reported, the underlying physiological processes are not clear. In the present work, we investigate the intensity of leaf scorching as affected by the balance between ammonium assimilation and accumulation. Leaves were sprayed with urea–ammonium nitrate (UAN) solution without surfactant or applied liquid droplets of urea in different N concentrations with surfactant. UAN solutions without surfactant containing >10% N caused leaf scorching already after 24 h and the severity increased with the N concentration. The same pattern was observed 3 days after the application of urea solutions containing >4% N together with surfactant. The scorching was accompanied by a massive increase in foliar and apoplastic ammonium (NH4+) concentration. Moreover, the activity of glutamine synthetase (GS), most pronouncedly that of the chloroplastic isoform (GS2), decreased a few hours after the application of high N-concentrations. Along with this, the concentration of glutamate—the substrate for GS—decreased. We conclude that leaf scorching is promoted by NH4+ accumulation due to a limitation in N assimilation capacity." @default.
- W4285147321 created "2022-07-14" @default.
- W4285147321 creator A5008567312 @default.
- W4285147321 creator A5037999459 @default.
- W4285147321 creator A5072053497 @default.
- W4285147321 creator A5091650390 @default.
- W4285147321 date "2022-06-11" @default.
- W4285147321 modified "2023-10-07" @default.
- W4285147321 title "Leaf Scorching following Foliar Fertilization of Wheat with Urea or Urea–Ammonium Nitrate Is Caused by Ammonium Toxicity" @default.
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- W4285147321 doi "https://doi.org/10.3390/agronomy12061405" @default.
- W4285147321 hasPublicationYear "2022" @default.
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