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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
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Nitro-fatty acids modulate germination onset through S-nitrosothiol metabolism.

Capilla Mata-Pérez1,2, Juan C Begara-Morales1, María N Padilla1

  • 1Group of Biochemistry and Cell Signaling in Nitric Oxide, Department of Experimental Biology, Faculty of Experimental Sciences, University Institute for Research in Olive Groves and Olive Oils, University of Jaén, Campus "Las Lagunillas" s/n, E-23071 Jaén, Spain.

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Nitro-fatty acids (NO2-FAs) regulate plant development by modulating nitric oxide (NO) and S-nitrosothiol (SNO) metabolism. Specifically, nitro-linolenic acid (NO2-Ln) impacts germination by affecting S-nitrosoglutathione reductase1 (GSNOR1) activity.

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Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Nitro-fatty acids (NO2-FAs) are key components of nitric oxide (NO) signaling in eukaryotes.
  • Nitro-linolenic acid (NO2-Ln) is the major NO2-FA in plants and regulates S-nitrosoglutathione (GSNO) levels.
  • The molecular mechanisms by which NO2-FAs influence NO signaling in plants are not fully understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which NO2-Ln modulates S-nitrosothiol (SNO) content in Arabidopsis.
  • To investigate the role of NO2-Ln in plant germination and development.
  • To establish the link between NO2-FAs, NO/SNO metabolism, and plant physiology.

Main Methods:

  • Physiological, biochemical, and molecular approaches were employed.
  • Analysis of the aer mutant (alkenal reductase knockout) for NO2-Ln and SNO content.
  • Investigation of S-nitrosoglutathione reductase1 (GSNOR1) S-nitrosylation and transcript levels.
  • Assessment of NO2-Ln effects on seed germination and ABSCISIC ACID INSENSITIVE 5 (ABI5) degradation.

Main Results:

  • NO2-Ln modulates SNO content via S-nitrosylation of GSNOR1.
  • The aer mutant shows increased NO2-Ln, decreased GSNOR1 transcript, and elevated SNO content.
  • NO2-Ln application to seeds enhances germination success by promoting ABI5 degradation.
  • NO2-FAs indirectly modulate total SNO content through NO release and GSNOR1 S-nitrosylation.

Conclusions:

  • NO2-FAs regulate plant development through NO and SNO metabolism.
  • NO2-FAs play a significant role in plant physiology, particularly in germination.
  • This study reveals a novel mechanism of NO2-FA action in plants via GSNOR1 modulation.