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THE ROLE OF FREE RADICALS IN SENESCENCE AND WOUNDING.

J E Thompson1, R L Legge1, R F Barber1

  • 1Departments of Biology and Chemical Engineering, University of Waterloo, Ontario, Canada N2L 3G1.

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|April 20, 2021
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Summary
This summary is machine-generated.

Plant senescence involves free radicals and oxidative damage, primarily from oxygen species. Lipid peroxidation in membranes initiates this damage, affecting cellular components and leading to cell death. Understanding these processes is key to plant aging research.

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Oxidative Stress Research

Background:

  • Plant senescence is characterized by oxidative deterioration and cell death, with free radicals playing a significant role.
  • Activated oxygen species, including those derived from molecular oxygen and singlet oxygen, are implicated as primary mediators of oxidative damage.

Purpose of the Study:

  • To investigate the role of free radicals and activated oxygen species in plant senescence and oxidative damage.
  • To explore the mechanisms of lipid peroxidation and its contribution to cellular deterioration during senescence.

Main Methods:

  • Analysis of lipoxygenase activity and its correlation with senescence progression in plant tissues.
  • Investigation of lipid peroxidation in senescing membranes and the release of fatty acids.
  • Examination of other potential sources of free radical production, such as peroxidase and electron transport systems.

Main Results:

  • Lipid degradation in senescing membranes provides substrate for lipoxygenase, initiating oxidative damage.
  • Both membranous and cytosolic lipoxygenase forms contribute to activated oxygen species production.
  • Damage to macromolecules, particularly unsaturated fatty acids in membranes, alters cellular structure and function.

Conclusions:

  • Free radical reactions, especially lipid peroxidation, are central to oxidative damage during plant senescence.
  • Membrane integrity is compromised, leading to altered fluidity and leakiness.
  • Wounding and potential plant-animal defense responses also involve similar oxidative mechanisms.