Photosynthetic Inactivation on Microcystis aeruginosa under Sub-lethal UV-C lrradiation during Growth Suppression
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.
Microcystis aeruginosa sub-lethal UV-C irradiation growth suppression cell integrity photosynthetic activity
Tao yi Zhang xihui Mao xianzhong
Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, T
国内会议
武汉
英文
802-806
2009-11-01（万方平台首次上网日期，不代表论文的发表时间）