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Related Experiment Videos

Altered gene expression during cold acclimation of spinach.

C L Guy, K J Niemi, R Brambl

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1985
    PubMed
    Summary

    Cold acclimation in spinach plants involves changes in gene transcription. Low temperatures alter messenger RNA (mRNA) populations, enhancing freezing tolerance independently of heat shock responses.

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    Area of Science:

    • Plant Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Cold acclimation enhances plant tolerance to extracellular freezing.
    • The metabolic and genetic underpinnings of this plant cold response remain unclear.

    Purpose of the Study:

    • To investigate if cold acclimation in spinach is driven by alterations in gene transcription.
    • To understand the molecular basis of increased freezing tolerance in response to low temperatures.

    Main Methods:

    • Analyzing translatable poly(A)+ RNA populations from spinach leaves using in vitro translation assays.
    • Correlating changes in mRNA profiles with the development of freezing tolerance.
    • Comparing low temperature-induced mRNA changes with heat shock protein synthesis.

    Main Results:

    • Exposure to 5°C rapidly altered translatable mRNA populations in spinach leaves.
    • Increased levels of mRNAs encoding two high molecular weight proteins correlated with enhanced freezing tolerance.
    • Prolonged cold acclimation (8 days) induced further mRNA changes, with some increasing and others decreasing.
    • Low temperature-induced polypeptides were largely distinct from heat shock proteins.

    Conclusions:

    • Cold acclimation in spinach is mediated by significant changes in gene transcription.
    • The observed mRNA alterations are a distinct molecular response from heat shock.
    • These transcriptional changes are fundamental to developing enhanced freezing tolerance in plants.

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