Herbicide is playing an increasingly important role in modern high-efficiency horticulture. Commonly used herbicides are glyphosate, glyphosate, atrazine, bromoxynil and so on.

There are two main strategies to improve the herbicide resistance of crops through genetic engineering technology: one is to introduce the target enzyme or target protein gene encoding the specific herbicide effect to produce excessive target enzyme, or introduce mutant gene to change the sensitivity of the target protein to the herbicide, so as to obtain the herbicide resistance, such as glyphosate-resistant tomatoes, rapeseed, soybeans, etc.

The second is to introduce genes whose expression products can detoxify herbicides, such as PPT-resistant tomatoes, potatoes and alfalfa. The planting area of herbicide-resistant transgenic crops ranks first among all transgenic crops.