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Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor

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Effect of acetaldehyde, arsenite, ethanol, and heat shock on protein synthesis and chilling sensitivity of cucumber

Mikal E. Saltveit¹, Galen Peiser, Abdur Rab

¹Mann Laboratory, Department of Vegetable Crops, University of California, Davis, CA 95616-8631, USA.

Physiologia Plantarum

|March 23, 2004

Summary

Cucumber seedlings exposed to chilling temperatures experience significant growth inhibition. Pre-treatments like acetaldehyde, ethanol, or heat stress enhance chilling tolerance by suppressing protein synthesis, suggesting this mechanism is key to plant survival.

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Area of Science:

Plant Physiology
Biochemistry
Stress Biology

Background:

Chilling temperatures severely inhibit plant growth, particularly in sensitive species like cucumber.
Understanding the molecular mechanisms behind chilling tolerance is crucial for agricultural applications.

Purpose of the Study:

To investigate the effects of various abiotic stresses on cucumber seedling chilling tolerance.
To elucidate the role of protein synthesis and specific protein induction in acquired chilling tolerance.

Main Methods:

Cucumber seedlings with 5-1 mm radicles were subjected to chilling (2.5°C for 96h) after pre-treatments.
Pre-treatments included acetaldehyde vapor, ethanol solution, heat shock (45°C), and arsenite solution.
Protein synthesis was assessed by measuring [(35)S]-methionine incorporation, and protein profiles were analyzed.

Main Results:

Chilling inhibited radicle growth by 92%; pre-treatments significantly reduced this inhibition (36-47%).
Effective pre-treatments induced new protein synthesis and suppressed de novo protein synthesis by ~70%.
Arsenite induced protein synthesis similar to heat shock but did not confer chilling tolerance.

Conclusions:

Acquired chilling tolerance in cucumber seedlings is strongly linked to the suppression of de novo protein synthesis.
While specific protein induction may occur, the general suppression of protein synthesis appears more critical for enhancing chilling tolerance.
Abiotic stresses that modulate protein synthesis pathways offer potential strategies for improving plant cold hardiness.