Abstract
Tobacco plants (Nicotiana tabacum cv Samsun NN) have been transformed with the gene encoding the type-2 ribosome-inactivating protein (RIP) SNA-I' from elderberry (Sambucus nigra) under the control of the Cauliflower Mosaic Virus 35S promoter. Previous research confirmed that these plants synthesize, correctly process and assemble a fully active RIP. Variability in protein expression was observed within the transgenic lines. The effects of the type-2 RIP SNA-I' delivered through a leaf feeding assay were evaluated in the laboratory on two economically important pest insects belonging to the orders of Hemiptera, the tobacco aphid (Myzus nicotianae) and Lepidoptera, the beet armyworm (Spodoptera exigua). In the experiment with aphids, significant effects were observed on the life parameters, such as survival, intrinsic rate of increase, net reproductive rate, mean generation time and mean daily offspring, whereas with caterpillars significant reduction in fresh weight as well as retardation in development were observed. In addition, significant increases in mortality were noted for insects fed on the transgenic lines as compared to wild type plants. This information provides further support for RIPs having a role in plant resista...Continue Reading
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