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Related Experiment Videos

Cold Acclimation in Arabidopsis thaliana.

S J Gilmour1, R K Hajela, M F Thomashow

  • 1Department of Crop and Soil Science, Michigan State University, East Lansing, Michigan 48824.

Plant Physiology
|July 1, 1988
PubMed
Summary

Arabidopsis thaliana plants enhance freezing tolerance through cold hardening. Low temperatures alter translatable mRNA populations, increasing specific protein synthesis for cold acclimation.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Arabidopsis thaliana exhibits differential responses to environmental stresses.
  • Cold hardening is a crucial process for plant survival in low temperatures.
  • Understanding molecular mechanisms of cold acclimation is vital for crop improvement.

Purpose of the Study:

  • To investigate the cold hardening abilities of two Arabidopsis thaliana ecotypes: Landsberg erecta and Columbia.
  • To identify molecular changes, specifically mRNA populations, associated with cold-induced freezing tolerance.
  • To determine the synthesis and potential role of specific polypeptides during cold acclimation.

Main Methods:

  • Comparative analysis of freezing tolerance (LT50) in Landsberg erecta and Columbia under cold treatment (4°C).
  • In vitro translation assays using poly(A(+)) RNA from control and cold-treated Columbia plants to assess mRNA changes.
  • In vivo labeling experiments to confirm polypeptide synthesis in response to cold in both plant and callus tissues.

Main Results:

  • Both ecotypes showed significant increases in freezing tolerance after cold hardening.
  • Cold treatment induced changes in translatable mRNA populations, notably an increase in mRNAs for 160 kDa and 47 kDa polypeptides.
  • In vivo labeling confirmed the synthesis of the 160 kDa and at least two 47 kDa polypeptides in the cold.

Conclusions:

  • Arabidopsis thaliana effectively cold hardens, enhancing freezing tolerance.
  • Cold acclimation involves significant alterations in gene expression, leading to the synthesis of specific cold-responsive proteins.
  • The identified 160 kDa and 47 kDa polypeptides are likely involved in the plant's cold acclimation response.

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