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Mohamad Hamshou,Chenjing Shang,Jeroen De Zaeytijd,Els J.M. Van Damme,Guy Smagghe 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
Someribosome-inactivating proteins (RIPs) possess insecticidal activity. In this studywe investigated the activity of type 1 and type 2 RIPs fromapple (Malus domestica) against an economically important pest insect belonging to the order of Lepidoptera, the beet armyworm(Spodoptera exigua),with the use of tobacco plants overexpressing the apple RIPs. Insect bioassays using detached leaves fromtransgenic tobacco lines demonstrated that the ectopically expressed type 1 or type 2 RIPs from apple exerted a high entomotoxic activity.We scored up to 78% mortality during the larval stages of S. exigua.Moreover, a significant reduction in the larval weightwas observed in the surviving larvae fed on the transgenic lines at different time points as compared to wild type plants. In addition, apple RIPs also retarded the development of the larvae. These results provide further support for RIPs having a potential role in plant defense. It can be envisaged that these RIPs could be used in genetically engineered crops to enhance resistance against agronomically important insect pests.