Physiological Defense Mechanism of Ligularia intermedia Against UV-B Radiation on Dongling Mountain  

作　　者：李鑫 贾顺姬 简嘉 林孟仪 李骑昂 黄晓春 张超 张荣庆 张贵友 

机构地区：[1]Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China

出　　处：《Tsinghua Science and Technology》2003年第4期481-486,共6页清华大学学报（自然科学版（英文版）

基　　金：Supported by the Students Research Training(SRT) (No. 2 S0 0 5 ) and the Modern L ife Science Experimental Education Center of Tsinghua U niversit

摘　　要：Ligularia intermedia growing at different altitudes were used to investigate the mechanism of ultraviolet (UV) resistance on physiological aspects in the field. The tests compared the absorbance of the UV absorbing compound, the content of chlorophyll a, chlorophyll b, and carotenoids, and the activities of peroxidase (POX) and superoxide dismutase (SOD) in Ligularia intermedia growing at three different altitudes on Dongling Mountain in northern China. There were no significant differences between the plants growing at 1160 m and 1820 m. However, all of these factors increased dramatically at 2190 m. The results indicate that the UV resistance of the plants mainly depends on the mechanism of filtering the radiation and preventing the reactive oxygen species (ROS) damage produced by UV BLigularia intermedia growing at different altitudes were used to investigate the mechanism of ultraviolet (UV) resistance on physiological aspects in the field. The tests compared the absorbance of the UV absorbing compound, the content of chlorophyll a, chlorophyll b, and carotenoids, and the activities of peroxidase (POX) and superoxide dismutase (SOD) in Ligularia intermedia growing at three different altitudes on Dongling Mountain in northern China. There were no significant differences between the plants growing at 1160 m and 1820 m. However, all of these factors increased dramatically at 2190 m. The results indicate that the UV resistance of the plants mainly depends on the mechanism of filtering the radiation and preventing the reactive oxygen species (ROS) damage produced by UV B

关 键 词：UV  B radiation reactive oxygen species (ROS) photosynthetic pigment UV  absorbing compound superoxide dismutase (SOD) peroxidase (POX) 

分 类 号：Q945[生物学—植物学]