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Auxin-regulated gene expression.

J L Key, P Kroner, J Walker

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |November 17, 1986
    PubMed
    Summary
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    Auxin regulates plant cell elongation by modulating gene expression. This study identifies specific auxin-responsive mRNAs, demonstrating their direct link to cell growth in soybean hypocotyls.

    Area of Science:

    • Plant Molecular Biology
    • Plant Physiology
    • Gene Regulation

    Background:

    • Early studies suggested auxin-regulated gene expression influences cell processes like elongation.
    • Indirect evidence involved RNA and protein synthesis inhibitors, correlating auxin's effects on RNA with cell elongation.

    Purpose of the Study:

    • To provide direct evidence for auxin's influence on gene expression mediating cell elongation.
    • To identify and characterize specific auxin-responsive genes involved in soybean hypocotyl growth.

    Main Methods:

    • Utilized DNA-DNA and DNA-RNA hybridization techniques.
    • Employed mRNA isolation-translation and in vitro 2D gel analysis.
    • Applied recombinant DNA technologies for cloning genomic DNA and complementary DNAs (cDNAs).

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    Main Results:

    • Direct evidence confirmed auxin affects the expression of specific genes (poly(A)+ RNA levels).
    • Two cDNA clones (pJCW1, pJCW2) identified auxin-responsive mRNAs crucial for soybean hypocotyl elongation.
    • These mRNAs depleted without auxin and increased with auxin, correlating with cell elongation rates.

    Conclusions:

    • Auxin directly regulates the expression of specific genes involved in cell elongation.
    • The identified genes play a significant role in soybean hypocotyl growth.
    • Further research is needed to understand the precise regulatory mechanisms of auxin-responsive genes.