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Abstract
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Overexpression of an endogenous thionin enhances resistance of Arabidopsis against Fusarium oxysporum.

P Epple, K Apel, H Bohlmann
P Epple
Swiss Federal Institute of Technology (ETH), Institute of Plant Sciences, ETH-Zentrum, Zurich, Switzerland.
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K Apel
Swiss Federal Institute of Technology (ETH), Institute of Plant Sciences, ETH-Zentrum, Zurich, Switzerland.
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H Bohlmann
Swiss Federal Institute of Technology (ETH), Institute of Plant Sciences, ETH-Zentrum, Zurich, Switzerland.
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Published April 1997. DOI: https://doi.org/10.1105/tpc.9.4.509

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  • Copyright © 1997 by American Society of Plant Biologists

Abstract

Thionins are antimicrobial proteins that are thought to be involved in plant defense. Concordant with this view, we have recently shown that the Arabidopsis thionin Thi2.1 gene is inducible by phytopathogenic fungi. Here, we demonstrate that constitutive overexpression of this thionin enhances the resistance of the susceptible ecotype Columbia (Col-2) against attack by Fusarium oxysporum f sp matthiolae. Transgenic lines had a reduced loss of chlorophyll after inoculation and supported significantly less fungal growth on the cotyledons, as evaluated by trypan blue staining. Moreover, fungi on cotyledons of transgenic lines had more hyphae with growth anomalies, including hyperbranching, than on cotyledons of the parental line. No transcripts for pathogenesis-related PR-1, PR-5, or the pathogen-inducible plant defensin Pdf1.2 could be detected in uninoculated transgenic seedlings, indicating that all of the observed effects of the overexpressing lines are most likely the result of the toxicity of the THI2.1 thionin. Our findings strongly support the view that thionins are defense proteins.

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Overexpression of an endogenous thionin enhances resistance of Arabidopsis against Fusarium oxysporum.
P Epple, K Apel, H Bohlmann
The Plant Cell Apr 1997, 9 (4) 509-520; DOI: 10.1105/tpc.9.4.509

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Overexpression of an endogenous thionin enhances resistance of Arabidopsis against Fusarium oxysporum.
P Epple, K Apel, H Bohlmann
The Plant Cell Apr 1997, 9 (4) 509-520; DOI: 10.1105/tpc.9.4.509
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