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Related Experiment Videos

Alternative respiration and heat evolution in plants.

A Ordentlich1, R A Linzer, I Raskin

  • 1AgBiotech Center, Cook College, Rutgers University, P.O. Box 231, New Brunswick, New Jersey 08903-0231.

Plant Physiology
|December 1, 1991
PubMed
Summary

Microcalorimetry quantifies heat from the alternative respiratory pathway in plants. This method accurately measures alternative pathway activity in vivo, offering insights into plant stress responses.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Bioenergetics

Background:

  • The alternative respiratory pathway in plants dissipates significant energy as heat.
  • This pathway's activity increases under stress conditions like aging and chilling.

Purpose of the Study:

  • To demonstrate that microcalorimetry can quantify heat dissipation by the alternative respiratory pathway in vivo.
  • To establish heat evolution as a reliable measure of alternative pathway activity.

Main Methods:

  • Utilized microcalorimetry to measure heat evolution in aged potato slices and chill-stressed cucumber leaves.
  • Employed inhibitors like salicylhydroxamic acid (SHAM) and KCN to differentiate respiratory pathways.
  • Correlated calorimetric measurements with oxygen electrode-based respiration measurements.

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Main Results:

  • Aging potato slices showed a fourfold increase in heat evolution, resistant to KCN but blocked by SHAM.
  • Chill-stressed cucumber leaves exhibited temperature-dependent heat evolution, also inhibited by SHAM, not KCN.
  • Nitrogen or SHAM/KCN combinations significantly reduced heat evolution in both experimental models.

Conclusions:

  • Microcalorimetry provides a valid method for measuring alternative respiratory pathway activity in plants.
  • The alternative pathway is a significant contributor to heat dissipation in aged and chill-stressed plant tissues.
  • Findings support the role of the alternative pathway in plant stress adaptation.