Abstract: To explore responses of maize seedlings in different inbreed lines to enhanced ultraviolet- B radia- tion，48 inbreed lines were planted in artificial culturing room with 2 treatment groups．One group is the control and another group was treated with enhanced UV- B dose in 57．8 W/cm2 after 5 leaf stage,Using a portable TPS- 2 photosynthetic analysis system， the photosynthetic rate (A)，stomatal conductance (G)，intercellular CO₂ concentration (Ci) and transpiration rate (E) were recorded after six days of treatment．Results indicated that in most of test material，the leaf A，G，and E were increased above 10% under UV- B treatment and their percentage in 48 lines were 64．6%，47．9% and 54．2%，respectively．However，leaf E in 62． 5% lines was reduced above 10% under UV- B treatment．There is significant correlation between the responses of G and E．The test inbreed lines was divided into six categories based on their performances to UV- B treatment．There were 12．5% inbreed lines with high sensitive and tolerance to enhanced UV- B radiation，respectively．It can be concluded that there is significant geno- type difference for the sensitivity of maize inbreed line to enhanced UV- B radiation and the materials with high sen- sitive or tolerance to enhanced UV- B radiation could be obtained．

Key words: Maize, Inbreed line, UV- B radiation, Gas exchange

CLC Number: 

• S513.01