Figure 3. Agrobacterium-mediated transformation was firstly established for dicotyledonous plants and subsequently used for introduction of genes conferring new attributes to transgenic plants. Among those applications, the obtainment of transgenic plants resistant to insect attack has become one of the most important targets for plant genetic engineering. Transgenic tobacco plants expressing Bacillus thuringiensis d -endotoxin gene cry1Ab (B) successfully resists the attack of Heliothis virescens larvae. Non-transgenic plant (A) exhibits the damages of pest attack.

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