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Induced resistance and changes in the soluble protein fraction of cucumber cucumis sativus cultivar baton vert leaves locally infected with colletotrichum lagenarium or tobacco necrosis virus



Induced resistance and changes in the soluble protein fraction of cucumber cucumis sativus cultivar baton vert leaves locally infected with colletotrichum lagenarium or tobacco necrosis virus



Phytopathologische Zeitschrift 98(1): 47-52



Infection of leaves of cucumber, Cucumis sativus L. cv. Baton Vert with Colletotrichum lagenarium or tobacco necrosis virus (TNVD R/1:1.5/19:S/S:S/Fu) results in the appearance of local lesions 4-5 days after inoculation. Simultaneously an apparently novel protein appears in the soluble fraction of infected leaves as shown by electrophoresis of acid extracts in 10% polyacrylamide gels. The protein in fungus and virus infected tissue was similar with the same electrophoretic mobility (Rf0.70); it was not fungal mycelium or virus-coat protein and stained positively in gels as a glycoprotein. Cucumber cotyledons injected with a solution of actinomycin D (5 .mu.g/ml) and inoculated 24 h later with Colletotrichum lagenarium developed significantly larger lesions than did leaves injected with water. Resistance to challenge inoculation of 2nd true leaves with the fungus was reduced following actinomycin treatment. Actinomycin D decreased the amount of the apparent novel protein in soluble extracts of treated plants but increased the amount of mycelium. The possible roles of the protein in localizing the pathogen and inducing resistance are discussed.

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