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Fusicoccin, 14-3-3 proteins, and defense responses in tomato plants

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JournalPlant Physiology
DatePublished - Apr 1999
Issue number4
Volume119
Number of pages8
Pages (from-to)1243-1250
Original languageEnglish

Abstract

Fusicoccin (FC) is a fungal toxin that activates the plant plasma membrane HC-ATPase by binding with 14-3-3 proteins, causing membrane hyperpolarization. Here we report on the effect of FC on a gene-for-gene pathogen-resistance response and show that FC application induces the expression of several genes involved in plant responses to pathogens. Ten members of the PC-binding 14-3-3 protein gene family were isolated from tomato (Lycopersicon esculentum) to characterize their role in defense responses. Sequence analysis is suggestive of common biochemical functions for these tomato 14-3-3 proteins, but their genes showed different expression patterns in leaves after challenges. Different specific subsets of 14-3-3 genes were induced after treatment with FC and during a gene-for-gene resistance response. Possible roles for the H+-ATPase and 14-3-3 proteins in responses to pathogens are discussed.

    Research areas

  • MEMBRANE H+-ATPASE, MULTIPLE SIGNALING PATHWAYS, ISOFORM-SPECIFIC MANNER, BINDING COMPLEX, 14-3-3-PROTEINS ASSOCIATE, ARABIDOPSIS-THALIANA, REGULATORY PROTEINS, NITRATE REDUCTASE, FUNGAL PATHOGENS, PROTON PUMP

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