Photosynthetic Inactivation on Microcystis aeruginosa under Sub-lethal UV-C lrradiation during Growth Suppression
- 作者：Tao yiZhang xihuiMao xianzhong
- 会议时间：2009-11-01
- 关键词：Microcystis aeruginosa ; sub-lethal UV-C irradiation ; growth suppression ; cell integrity ; photosynthetic activity
- 作者单位：Tao yi(Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong)Zhang xihui(Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China)Mao xianzhong(Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, T)
- 母体文献：第十三届世界湖泊大会论文集
- 会议名称：第十三届世界湖泊大会
- 会议地点：武汉
- 主办单位：中国环境科学学会
- 语种：chi
摘要
Microcystis aeruginosa is a typical harmful bloom-forming cyanobacterium,especially in China waters.This study aims to investigate the effects of sub-lethal UV-C irradiation on M.aeruginosa suppression and recovery.M.aeruginosa of 106 cells/ml were exposed to UV-C irradiation at 0~200 m J/cm2 and subsequently incubated for 30 days under normal culture conditions.We assessed the cell density,cell integrity,and photosynthetic parameters ( rapid light response curves,its initial slope,and relative maximum electronic transport rate).The results suggested that sub-lethal UV-C irradiation at 50~200 mJ/cm2 can suppress M.aeruginosa growth for 5-15 days.UV-C irradiation at 20 and 50 mJ/cm2 is sub-lethal to M.aeruginosa cells as over 80 % of the exposed cells remained intact.However,UV-C irradiation at 100 and 200 mJ/cm2 induced severe cell disintegration in more than 70 % of the irradiated cells.Suppression effect on photosynthetic activity was induced by sub-lethal UV-C irradiation.Photosynthetic activity is more sensitive to sub-lethal UV-C irradiation UV-C irradiation than both growth and cell integrity.