Abstract: UV-B radiation is one of the environmental factors affecting the growth and development of plants. Plants are inevitable to subject to UV-B radiation when they accept energy and illumination from the sun, and formed a protective system in the long-term process of adaptation. In the protective system, enzymatic system is an important part. This paper discussed the effects of UV-B radiation on the activity of this enzymatic system, with the focus on the response mechanism of plant enzymatic system, and the relationships between this enzymatic system and signaling molecules. Some issues worthy to be further studied in this field were put forward.

Key words: Bt corn, Straw decomposition, Soil enzyme, Soil fertility