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Your Position :Home->Past Journals Catalog->2012年49 No.4

The relationship between Bt toxin content and resistance toSylepta derogata in various transgenic Bt cotton varieties
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Key Words:Sylepta derogate,transgenic cotton,resistance,Bt toxin protein
Abstract:In  recent years,Sylepta derogata Fabricius has been an important insect pest of late growth stage cotton in the
Yangtze River Region. In order to study the relationship between Bt toxin levels and resistance to S. derogata in transgenic
cotton,the Bt toxin content of the leaves of eight Bt cotton varieties was assayed and the resistance of each variety to S.
derogata comprehensively evaluated. The results show that the Bt toxin content of the leaves of Kangya-8017 and SGK321
were less than 120 μg / g and the resistance of these two varieties to S. derogate was moderate. The other 6 varieties of Bt
cotton were highly resistant to S. derogate and had toxic protein contents of > 150 μg / g. The parental non-transgenic
cotton variety did not show any resistance to S. derogate. These results indicate that the resistance of Bt transgenic cotton
to S. derogata is related to the level of Bt toxin in the plant.
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