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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / Effect of rice lines transformed with Bacillus thuringiensis toxin genes on the brown planthopper and its predator Cyrtorhinus lividipennis

Effect of rice lines transformed with Bacillus thuringiensis toxin genes on the brown planthopper and its predator Cyrtorhinus lividipennis

Authors: Bernal, C.C.; Aguda, R.M.; Cohen, M.B.
Journal, Volume, Year: Entomologia Experimntalis et Applicata, volume 102:21-28, 2002
Summary

Examined the effects of five transgenic lines of rice on the brown planthopper (Nilaparvata lugens) and its predator Cytorhinus lividipennis. Bt protein was detected in the honeydw of N. lugens using ELISA, but only for the lines using the CaMV 35S and actin promoters. There was a greater volume of acidic honeydew (indicates feeding in xylem rather than phloem) produced by N. lugens reared on Bt lines vs control lines. There were no apparent effects on C. lividipennis that were reared on Bt-fed N. lugens nymphs.

Comments

No apparent effect on fitness of either species from Bt consumption, although dose may be too low for C. lividipennis. Did demonstrate potential trophic exposure to predator, which is uncommon in literature. Change of acidity of the honeydew amongst transgenic lines indicates a change in feeding behavior of N. lugens, possibly due to detection of transgenic protein or a constituent of the modification process.