Abstract:

In order to investigate effect of ultraviolet radiation on the growth, development, physiology and biochemistry of Prunus mira Koehne, which was used as the material in this experiment and cultured in the specially Tibet ultraviolet environment, treated with ultraviolet(280-320 nm) by different intensity at different time. During the period of experiment, we checked these parameters: such as leaf number, chlorophyll, net photosynthetic rate, stomata conductance and the change of plant hormones. The results showed that, ultraviolet treatment could restrained the growth trend of Prunus mira, such as inhibited the new leaves growing, enhanced the falling rate of old leaves and also reduced the content of chlorophyll. In the later period of treatment, net photosynthetic rate and stomata conductance was reduced, during the ultraviolet treatment, the contents of ZR, GA in Prunus mira leaves was increased, accompany with the treatment period, the trend was continued, from the third day, contents of IAA decreased continually for the whole treatment period, the contents of ABA had a great growth from the third day to ninth day and reached culmination, after that decrease for a little