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Chilling-Induced Heat Evolution in Plants.

M. R. Moynihan1, A. Ordentlich, I. Raskin

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

Plant Physiology
|July 1, 1995
PubMed
Summary
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Chilling exposure increases plant respiration and heat evolution, especially in sensitive species. This heat production may aid plants in adapting to cold temperatures.

Area of Science:

  • Plant Physiology
  • Biochemistry
  • Environmental Stress Response

Background:

  • Plants exhibit increased respiration, particularly through the alternative pathway, when subjected to chilling temperatures.
  • This metabolic shift leads to a measurable increase in heat evolution within plant tissues.

Purpose of the Study:

  • To quantify the increase in heat evolution in response to chilling across various plant species.
  • To investigate the relationship between chilling sensitivity and the capacity for respiratory heat production.

Main Methods:

  • Microcalorimetry was employed to measure heat evolution in response to controlled chilling conditions (8°C for 8 hours).
  • Experiments were conducted under varying light (constant light vs. dark) and humidity conditions.

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Main Results:

  • Chilling-sensitive plant species showed a significant increase in heat evolution (47–98%).
  • Chilling-resistant species exhibited a more modest increase (7–22%), while the extremely sensitive *Episcia cupreata* showed no increase.
  • Increased heat evolution was observed under light or dark conditions but not at high humidity.

Conclusions:

  • The capacity to generate respiratory heat upon chilling exposure appears to correlate with chilling sensitivity.
  • Increased heat evolution may play a role in the cold-acclimation process, potentially protecting plants from cold damage.