Abstract
Abstract Recombinant DNA technology offers opportunities for widening the available gene pool for crop improvement. Genetic engineering also allows the introduction of several desirable genes in a single event, and can reduce the time to introgress novel genes into elite backgrounds. Genes conferring resistance to insects have been inserted into crop plants such as cotton, maize, potato, tobacco, rice, broccoli, lettuce, walnut, apple, alfalfa, and soybean. Genetically transformed crops with Bacillus thuringiensis (Bt) genes have been deployed for cultivation primarily in the USA, China, Argentina, Canada, Mexico, South Africa, and Australia. The potential of insect-resistant transgenic plants with Bt genes can be enhanced when deployed in combination with alternate protective genes such as protease inhibitors, enzymes, and plant lectins, or in combination with insect-resistant cultivars derived through conventional breeding. While several transgenic crops with insecticidal genes have been introduced in t...
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