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Nitric oxide and phytohormone interactions: current status and perspectives.

Luciano Freschi1

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Summary

Nitric oxide (NO) is a key plant signal interacting with plant hormones. This review explores how NO influences hormone levels and actions, impacting plant development and metabolism.

Keywords:
S-nitrosylationabscisic acidauxincytokininethylenegibberellinnitric oxideplant hormones

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Area of Science:

  • Plant Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Nitric oxide (NO) is a vital signaling molecule in plants, mediating responses to environmental and internal stimuli.
  • NO interacts with numerous endogenous molecules, including plant hormones, forming complex signaling pathways.

Purpose of the Study:

  • To review the mechanisms of nitric oxide-phytohormone interactions in regulating plant development and metabolism.
  • To highlight NO's influence on phytohormone biosynthesis, transport, perception, and signal transduction.

Main Methods:

  • Literature review of studies on NO-phytohormone interactions.
  • Analysis of NO's effects on gene transcription related to hormone regulation.
  • Discussion of S-nitrosylation as a post-translational modification mechanism.

Main Results:

  • Plant hormones influence endogenous NO levels, and NO affects multiple aspects of hormone activity.
  • NO modulates gene expression for hormone-related enzymes and transporters.
  • S-nitrosylation directly modifies hormone biosynthetic enzymes and receptors.

Conclusions:

  • NO and phytohormones engage in intricate regulatory cross-talk essential for plant physiology.
  • Understanding these interactions is crucial for deciphering plant developmental, metabolic, and defense responses.