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The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants
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Low Temperature-Induced Decrease in trans-Delta-Hexadecenoic Acid Content Is Correlated with Freezing Tolerance in

N P Huner1, J P Williams, E E Maissan

  • 1Department of Plant Science, University of Western Ontario, London, Ontario N6A 5B7, Canada.

Plant Physiology
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

Low temperature growth reduces trans-Delta(3)-hexadecenoic acid in phosphatidylglycerol in cereals, correlating with freezing tolerance. This impacts light harvesting complex II organization, aiding cold acclimation.

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Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Phosphatidylglycerol lipids are crucial for thylakoid membrane function.
  • Plant adaptation to cold involves changes in membrane lipid composition.
  • Trans-Delta(3)-hexadecenoic acid is a key fatty acid in phosphatidylglycerol.

Purpose of the Study:

  • To investigate the effect of low growth temperature on trans-Delta(3)-hexadecenoic acid content in cereals and dicots.
  • To determine the relationship between this lipid change and plant freezing tolerance.
  • To explore the impact on light harvesting complex II organization.

Main Methods:

  • Cultivating eight rye and wheat cultivars at 5°C.
  • Analyzing fatty acid composition of phosphatidylglycerol in whole leaf extracts and isolated thylakoids.
  • Assessing freezing tolerance and in vitro organization of light harvesting complex II.

Main Results:

  • Low temperature growth decreased trans-Delta(3)-hexadecenoic acid in monocots (rye, wheat) by 0-74%, linearly correlating with freezing tolerance.
  • Palmitic acid content increased in phosphatidylglycerol under cold growth.
  • Only two of six cold-tolerant dicots showed significant decreases in trans-Delta(3)-hexadecenoic acid.

Conclusions:

  • The modulation of phosphatidylglycerol by growth temperature affects light harvesting complex II organization differently across species.
  • This mechanism plays a role in cold acclimation and freezing tolerance, particularly in cereals.
  • The observed lipid changes are linked to physiological adaptations for surviving low temperatures.