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Membrane Lipid Breakdown in Relation to the Wound-induced and Cyanide-resistant Respiration in Tissue Slices: A

A Theologis1, G G Laties

  • 1Biology Department and Molecular Biology Institute, University of California, Los Angeles, California 90024.

Plant Physiology
|November 1, 1980
PubMed
Summary
This summary is machine-generated.

Fresh plant tissues exhibit varied responses to cyanide (CN), with some being sensitive and others resistant. Aging enhances respiration and glucose uptake, suggesting activation of existing capacity rather than new mitochondria.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Cellular Respiration

Background:

  • Plant storage organs and fruits display distinct responses to cyanide (CN), a common inhibitor of cellular respiration.
  • Freshly cut tissues can be categorized as either CN-sensitive or CN-resistant, influencing their metabolic activity.

Purpose of the Study:

  • To investigate the differential sensitivity of plant tissue slices to cyanide.
  • To elucidate the mechanisms underlying wound respiration and aging-induced respiratory changes.
  • To explore the roles of cytochrome and alternative respiratory pathways in plant tissues.

Main Methods:

  • Comparative analysis of fresh and aged tissue slices from storage organs and fruits.
  • Measurement of respiration rates and sensitivity to cyanide (CN).
  • Assessment of lipid breakdown and glucose utilization.
  • Investigation of cytochrome and alternative respiratory pathways using uncouplers and inhibitors.

Main Results:

  • Fresh tissue slices fall into CN-sensitive and CN-resistant categories, with lipid breakdown observed only in sensitive slices.
  • Slicing induces a significant increase in respiration (wound respiration), further elevated by aging (wound-induced respiration).
  • Wound respiration is primarily mediated by the cytochrome pathway, while wound-induced respiration involves both cytochrome and alternative pathways in some resistant tissues.
  • Aging enhances glucose uptake, indicating a transport lesion repair dependent on lipid biosynthesis, not wound respiration.

Conclusions:

  • Plant tissue responses to cyanide are heterogeneous, linked to lipid metabolism and membrane integrity.
  • Aging in plant tissues involves activating pre-existing respiratory capacity rather than de novo synthesis of mitochondria.
  • Membrane integrity is crucial for alternative pathway function, with lipid breakdown leading to its loss.
  • The repair of glucose transport during aging is independent of wound respiration but relies on lipid biosynthesis.