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Fusicoccin, 14-3-3 Proteins, and Defense Responses in Tomato Plants1

Michael R. Roberts* and Dianna J. Bowles

The Plant Laboratory, Department of Biology, University of York, P.O. Box 373, York YO10 5YW, United Kingdom

Fusicoccin (FC) is a fungal toxin that activates the plant plasma membrane H+-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 FC-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.

1   This work was funded by a U.K. Biotechnology and Biological Sciences Research Council Realising Our Potential Award to D.J.B. and by a Royal Society Fellowship to M.R.R.
*   Corresponding author; e-mail mrr5{at}york.ac.uk; fax 44-1904-434312.

Plant Physiol. (1999) 119: 1243-1250
Copyright Clearance Center:   0032-0889/99/119//08
© 1999 American Society of Plant Physiologists




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