关键词: 硒, 抗氧化, 自由基, 机制, 展望

Abstract: It is of great significance to study the effects and mechanisms of selenium (Se) in plant, because Se can do benefit to plant. The antioxidant system includes antioxidant enzymes and molecular antioxidant substances. This paper summarized research achievements at home and abroad, and reviewed the related research progress in this field. The researches at home and abroad found that the suitable concentration of Se could enhance the antioxidant capacity of plants and decrease the content of MDA, while excessive Se could aggravate the oxidative damage of plants. Therefore, the effects of Se on plant had two sides. This paper summerized the mechanisms of Se on the antioxidant system of plants included adjusting the content of active oxygen free radicals, transforming the form of Se, inserting into the iron sulfur cluster which affects the electron transport chain, repairing the cell membrane structure and cell integrity, recoverying photosynthesis and regulating the content of essential elements (cofactor). This paper was expected to provide references for the futher study of the effects of Se on resistance to abiotic stresses.

Key words: selenium, antioxidant, radical, mechanism, prospect