Quantification of Cry 1 Ac and Cry2Ab in different plant parts of Bollgard-ll cotton hybrids

摘要

Transgenic Cry 1 Ac Bacillus thuringiensis (Bt) cotton (Bollgard in the United States, Ingard in Australia, Monsanto Co., St. Louis, MO) was commercialized in 1996 as a tool to selectively manage cotton pests. This technology is highly beneficial to the grower and the environment by reducing chemical insecticide treatments for target pests, increasing crop yields, and preserving populations of beneficial arthropods (Gianessi and Carpenter, 1999). However, for the Bt-transgenic technology to be sustainable, it is important that the toxin expression levels be expressed at adequate quantities in appropriate plant parts at the requisite time of the season to afford protection against major target insect pests, which primarily include the bollworms.