Planta

, Volume 219, Issue 2, pp 261–269

Fusicoccin activates pathogen-responsive gene expression independently of common resistance signalling pathways, but increases disease symptoms in Pseudomonas syringae-infected tomato plants

Original Article

DOI: 10.1007/s00425-004-1234-5

Cite this article as:
Singh, J. & Roberts, M.R. Planta (2004) 219: 261. doi:10.1007/s00425-004-1234-5

Abstract

Fusicoccin (FC), an activator of the plant plasma membrane H+-ATPase, induces several components of plant pathogen resistance responses, including defence hormone biosynthesis and pathogenesis-related (PR) gene expression. The mechanism by which these responses occur, and the effect they have on plant–pathogen interactions is unknown. Here, we show that PR gene expression in response to FC in tomato (Lycopersicon esculentum Mill.) plants does not strictly require the common defence hormones, salicylic acid, jasmonic acid and ethylene. We also show that FC-induced PR gene expression requires neither Ca2+ nor reactive oxygen species, typical early pathogen-resistance response signals. The possibility that PR gene expression is related to FC-induced dehydration stress is also discounted. Finally, we show that the defence responses elicited by FC in tomato are not sufficient to confer resistance to the bacterial pathogen Pseudomonas syringae. Rather, FC increases the rate and severity of disease symptom formation in an ethylene-dependent manner.

Keywords

Defence response Fusicoccin Lycopersicon Pathogenesis-related gene Signalling 

Abbreviations

DPI

Diphenylene iodonium

EGTA

Ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid

FC

Fusicoccin

HR

Hypersensitive response

INA

2,6-Dichloroisonicotinic acid

JA

Jasmonic acid

PM

Plasma membrane

ROS

Reactive oxygen species

PR

Pathogenesis-related

SA

Salicylic acid

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Department of Biological Sciences, Lancaster Environment Centre, Institute of Environmental and Natural SciencesLancaster UniversityLancasterUK

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