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Related Experiment Videos

Cyanide-insensitive Respiration in Pea Cotyledons.

T W James1, M S Spencer

  • 1Department of Plant Science, University of Alberta, Edmonton, Alberta, T6G 2H1 Canada.

Plant Physiology
|September 1, 1979
PubMed
Summary

Pea seedling mitochondria develop cyanide-resistant respiration during germination. This alternative respiration pathway emerges after 24 hours and becomes significant by day 7, contributing to succinate oxidation.

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Area of Science:

  • Plant Physiology
  • Mitochondrial Respiration
  • Biochemistry

Background:

  • Mitochondria are crucial for cellular energy production.
  • Cyanide-resistant respiration is an alternative pathway in some organisms.
  • Understanding plant mitochondrial function during development is important.

Purpose of the Study:

  • To investigate the development of cyanide-resistant respiration in pea cotyledon mitochondria.
  • To correlate respiration changes with seedling development stages.
  • To explore the relationship between mitochondrial structure and alternative respiration.

Main Methods:

  • Isolation of mitochondria from pea cotyledons using a zonal procedure.
  • Measurement of succinate oxidation rates.
  • Assessment of cyanide inhibition on mitochondrial respiration.
  • Determination of cyanide-resistant respiration activity.

Main Results:

  • Mitochondria from germinating pea cotyledons exhibit cyanide-resistant respiration.
  • This respiration pathway is absent in early germination (first 24 hours).
  • Cyanide-resistant respiration gradually increases, reaching 15-20% of succinate oxidation by day 6-7.

Conclusions:

  • Pea seedling development is associated with the emergence of cyanide-resistant mitochondrial respiration.
  • This alternative respiration pathway plays a role in later stages of seedling growth.
  • Further research is needed to understand the structural and functional implications.

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