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Expression of viral genes in transgenic plants is a very effective tool for attenuating plant viral infection. Nevertheless, the lack of generality and risk issues related to the expression of viral genes in plants might limit the exploitation of this strategy. Expression in plants of antibodies against essential viral proteins could provide an alternative approach to engineer viral resistance. Recently, expression of complete or engineered antibodies has been successfully achieved in plants. The engineered single-chain Fv antibody scFv (refs 10, 11) is particularly suitable for expression in plants because of its small size and the lack of assembly requirements. Here we present evidence that constitutive expression in transgenic plants of a scFv antibody, directed against the plant icosahedral tombusvirus artichoke mottled crinkle virus, causes reduction of infection incidence and delay in symptom development.
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