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2012年49 No.4
Effects of transgenic Cry1Ac + CpTI cotton on carboxylesteraseactivity in Helicoverpa armigera
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Key Words：cotton bollworm，CarE，transgenic cotton
Abstract：In order to clarify changes in the carboxylesterase ( CarEs) activity of Helicoverpa armigera( Hübner) feeding
on transgenic cotton，and the recovery of carboxylesterase activity in H． armigera that fed on non-transgenic cotton after
feeding on transgenic cotton for 1 to 3 days，transgenic and non transgenic cotton leaves were fed to some fourth-instar H．
armigera larva for 5 days，after which some were fed with non-transgenic cotton leaves for a few days after feeding on
transgenic cotton leaves for 1 day or 3 days． Midgut CarEs activity was examined every 24 hours． The results show that
CarEs activity in H． armigera fed on non-transgenic cotton leaves increased over time，whereas that of H． armigera fed on
transgenic cotton leaves first increased then decreased． The enzyme activity of cotton bollworms fed on non-transgenic
cotton leaves after feeding on transgenic cotton leaves for one day decreased gradually over time，whereas that of those fed
on non-transgenic cotton leaves after feeding on transgenic cotton leaves for three days remained higher than the control．
These results indicate that CarEs activity in H． armigera can be induced by feeding on trangenetic cotton leaves and that
this plays a role in the resistance of H． armigera to the Cry1Ac toxin．