Abstract: The infestation of paraquat-resistant weeds can cause serious damage to food production, and indirectly increase environmental pollution. This paper reviewed the recent years’ research advances in the occurrence, development, and damage of paraquat-resistant weeds, and discussed the mechanisms of paraquat-resistant weeds, with the focus on the relationship between transporter and resistance, restriction and isolation, protective effect of antioxidant enzymes, influence of light on resistant mechanisms, and genetics of paraquat resistance. It was considered that there would be an outbreak risk of paraquat-resistant weeds in China in the future, and the strategies of delaying the occurrence of paraquat-resistant weeds were suggested.

Key words: Bt cotton, high temperature, Bt protein, nitrogen metabolic physiology.