RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2008, Vol. 17 >> Issue (5): 775-775.

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EFFECTS OF HCO-3 ALKALINITY ON GROWTH AND PHOTOSYNTHETIC ACTIVITY OF MICROCYSTIS AERUGINOSA FACHB 927

KANG Lijuan1|2| PAN Xiaojie1|2| CHANG Fengyi1|2| SHEN Yinwu1| LI Dunhai1| LIU Yongding1   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-09-20

Abstract:

The effect of alkalinity on higher plants has been studied extensively，but little is known for aquatic plants，especially bloom forming cyanobacteria．In order to study the impacts of alkalinity on bloomforming cyanobacterium，〖WTBX〗Microcystis aeruginosa〖WTBZ〗 FACHB 927 was cultured under two different bicarbonate (HCO-3) alkalinity including 23 mM (ALK23) and 124 mM (ALK124) and its growth，photosynthetic performance and pigments were investigated in present study.ALK23 reduced the biomass by 38% at the end of culture in comparison with the control.ALK124 showed no significant effect on the biomass，but there was a rapid multiplication at the prophase.The results showed that the contents of chlorophyll a decreased by 74% and 56% under ALK23 and ALK124 respectively.Elevated alkalinity increased PBP/Chla ratio.Photosynthetic activity was restrained at the prophase of culture and then resumed at the anaphase under elevated alkalinity.
It is shown that low alkalinity (ALK23) could promote photosynthetic activity，whereas high alkalinity (ALK124) made no remarkable difference.Thus it can be concluded that alkalinity may be a scientific tool for preventing and managing 〖WTBX〗Microcystis〖WTBZ〗 bloom in freshwater.

Key words: alkalinity, Microcystis aeruginosa, chlorophyll a, photosynthetic activity

[1] ZHANG Shenghua, GE Fangjie, WANG Hongqiang, HU Chenyan, WU Zhenbin. PHOSPHATE UPTAKE IN UNICELLULAR MICROCYSTIS AERUGINOSA UNDER DIFFERENT NITROGEN AND PHOSPHORUS CONDITIONS [J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2008, 17(6): 909-909.
[2] YAN Runrun, PANG Yong, WANG Ke, CHEN Xiaofeng, ZHAO Wei. DYNAMICS OF MICROCYSTIS AERUGINOSA AND SCENEDESMUS OBLIQUUS IN CULTURE SYSTEMS WITH DIFFERENT PHOSPHORUS CONCENTRATION  [J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2008, 17(2): 301-301.
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