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Related Experiment Videos

Plants and high temperature stress.

E Weis1, J A Berry

  • 1Botanisches Institut der Universität Düsseldorf, Fed. Rep. Germany.

Symposia of the Society for Experimental Biology
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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High temperatures impair plant photosynthesis by affecting light reactions. Acclimation and light exposure can improve heat tolerance, but imbalances in carbon metabolism still limit CO2 assimilation.

Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Thermal Stress Biology

Background:

  • High temperatures primarily impact photosynthetic functions in higher plants.
  • Leaf heat tolerance is linked to the thermal sensitivity of primary photochemical reactions in the thylakoid membrane.
  • Acclimation and light exposure influence plant thermal stability.

Purpose of the Study:

  • To investigate the energetic balance between carbon metabolism and light reactions in cotton leaves under varying temperatures.
  • To examine the effects of high temperatures on photosynthetic gas exchange and chlorophyll fluorescence.
  • To understand the regulatory mechanisms of photosynthesis under thermal stress.

Main Methods:

  • Studies of photosynthetic gas exchange.

Related Experiment Videos

  • Chlorophyll fluorescence measurements.
  • Analysis of cotton leaves at different temperatures during steady-state photosynthesis.

    • Main Results:

    • At supraoptimal temperatures, feedback control of light reactions by carbon metabolism declines, increasing dissipative processes.
    • Photorespiration can dissipate more energy than CO2 assimilation.
    • Temperature-induced non-photochemical quenching reduces photosystem 2 efficiency, and CO2 assimilation is limited by carbon metabolism regulation, including ribulose-1,5-bisphosphate carboxylase/oxygenase down-regulation.

    Conclusions:

    • High temperatures disrupt the energetic balance in photosynthesis, affecting both light-dependent and carbon-fixation reactions.
    • While plants possess acclimation mechanisms, high temperatures ultimately limit CO2 assimilation due to regulatory imbalances.
    • Understanding these mechanisms is crucial for improving crop heat tolerance.