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Nitric Oxide Signaling Pathway01:28

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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
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Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
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Nitric oxide on/off in fruit ripening.

F J Corpas1, J M Palma1

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Plant Biology (Stuttgart, Germany)
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Nitric oxide (NO) plays a crucial role in fruit ripening, alongside ethylene. Applying NO externally can improve fruit quality, offering new insights into postharvest physiology.

Keywords:
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Area of Science:

  • Plant Physiology
  • Postharvest Biology
  • Biochemistry

Background:

  • Fruit ripening involves complex physiological and biochemical changes.
  • Fruits are classified as climacteric or non-climacteric based on ethylene dependence.
  • Emerging evidence highlights the role of nitric oxide (NO) in fruit ripening.

Purpose of the Study:

  • To investigate the involvement of nitric oxide (NO) in fruit ripening.
  • To explore the potential benefits of exogenous NO application on fruit quality.

Main Methods:

  • Literature review on NO's role in fruit physiology.
  • Analysis of studies on NO's interaction with ethylene signaling.
  • Examination of research on exogenous NO application in fruits.

Main Results:

  • Nitric oxide (NO) is confirmed as a significant signaling molecule in fruit ripening.
  • Exogenous application of NO positively impacts various fruit quality attributes.
  • NO's role complements or modulates ethylene-dependent pathways.

Conclusions:

  • Nitric oxide (NO) is a key factor in regulating fruit ripening processes.
  • NO application presents a promising strategy for enhancing postharvest fruit quality.