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Research ArticlePLANT-MICROBE AND PLANT-INSECT INTERACTIONS
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Wound Signaling in Tomato Plants

Evidence That ABA Is Not a Primary Signal for Defense Gene Activation

Guy F. Birkenmeier, Clarence A. Ryan
Guy F. Birkenmeier
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Clarence A. Ryan
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Published June 1998. DOI: https://doi.org/10.1104/pp.117.2.687

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  • Copyright © 1998 American Society of Plant Physiologists

Abstract

The effects of abscisic acid (ABA) on the accumulation of proteinase inhibitors I (Inh I) and II (Inh II) in young, excised tomato (Lycopersicon esculentum L.) plants were investigated. When supplied to excised plants through the cut stems, 100 μm ABA induced the activation of the ABA-responsive le4 gene. However, under the same conditions of assay, ABA at concentrations of up to 100 μm induced only low levels of proteinase-inhibitor proteins or mRNAs, compared with levels induced by systemin or jasmonic acid over the 24 h following treatment. In addition, ABA only weakly induced the accumulation of mRNAs of several other wound-response proteins. Assays of the ABA concentrations in leaves following wounding indicated that the ABA levels increased preferentially near the wound site, suggesting that ABA may have accumulated because of desiccation. The evidence suggests that ABA is not a component of the wound-inducible signal transduction pathway leading to defense gene activation but is likely involved in the general maintenance of a healthy plant physiology that facilitates a normal wound response.

  • Abbreviations:

    Inh I and II
    proteinase inhibitors I and II, respectively
    JA
    jasmonic acid
    swrps
    systemic wound-response proteins
    • Received September 24, 1997.
    • Accepted March 11, 1998.
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    Wound Signaling in Tomato Plants
    Guy F. Birkenmeier, Clarence A. Ryan
    Plant Physiology Jun 1998, 117 (2) 687-693; DOI: 10.1104/pp.117.2.687

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    Wound Signaling in Tomato Plants
    Guy F. Birkenmeier, Clarence A. Ryan
    Plant Physiology Jun 1998, 117 (2) 687-693; DOI: 10.1104/pp.117.2.687
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    Plant Physiology: 117 (2)
    Plant Physiology
    Vol. 117, Issue 2
    Jun 1998
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