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引用本文:支彦丽,储昭升,钟远,李贺,庄源益.铜绿微囊藻和四尾栅藻光合利用碳酸氢盐探讨.湖泊科学,2008,20(4):443-449. DOI:10.18307/2008.0406
ZHI Yan-li,CHU Zhao-sheng,ZHONG Yuan,LI He,ZHUANG Yuan-yi.Photosynthetic HCO3- utilization of Microcystis aeruginosa and Scenedesmus quadriccauda. J. Lake Sci.2008,20(4):443-449. DOI:10.18307/2008.0406
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铜绿微囊藻和四尾栅藻光合利用碳酸氢盐探讨
支彦丽1, 储昭升2, 钟远1,3, 李贺1, 庄源益1
1.南开大学环境科学与工程学院 天津 300071;2.中国环境科学研究院, 北京 100012;3.天津城市建设学院, 天津 300084
摘要:
为了探讨藻类光合过程对碳酸氢盐的利用,研究不同pH值下铜绿微囊藻和四尾栅藻的净光合速率,并着重研究这两株藻的碳酸氢盐摄取速率.结果表明,从弱酸性到弱碱性,四尾栅藻的净光合速率都比铜绿微囊藻高.由pH值超过pH转折点后的无机碳摄取速率计算得到的碳酸氢盐摄取速率对铜绿微囊藻和四尾栅藻分别为142.14和314.08μmolDIC/(g?h,FW),故这两株藻都可利用碳酸氢盐作为碳源进行光合,且均为强碳酸氢盐利用者;但是,四尾栅藻对碳酸氢盐的利用能力强于铜绿微囊藻.另外,与四尾栅藻相比,铜绿微囊藻的碳酸氢盐摄取速率更易受抑制剂的抑制.
关键词:  铜绿微囊藻  四尾栅藻  pH值  净光合速率  碳酸氢盐摄取速率
DOI:10.18307/2008.0406
分类号:
基金项目:国家重点基础研究发展规划(973)项目(2002CB412301)资助
Photosynthetic HCO3- utilization of Microcystis aeruginosa and Scenedesmus quadriccauda
ZHI Yan-li1, CHU Zhao-sheng2, ZHONG Yuan1,3, LI He1, ZHUANG Yuan-yi1
1.College of Environmental Science and Engineering, Nankai University, Tianjin 300071, P.R.China;2.Chinese Research Academy of Environmental Sciences, Beijing 100012, P.R.China;3.Tianjin Urban Construction Institute, Tianjin 300084, P.R.China
Abstract:
In order to understand the HCO3- utilization in algal photosynthesis, net photosynthetic rate (NPS) under different pH values and photosynthetic bicarbonate uptake rate (PCUBC) were investigated. The results indicated that the NPS of Scenedesmus quadricauda were all higher than that of Microcystis aeruginosa from weak acid to weak alkaline cultures. The PCUBC, characterized as a parameter of bicarbonate utilization of alga and calculated as an average of photosynthetic carbonate uptake rate in pH range over pH turning point (pHTP), were 142.14 and 314.08μmolDIC/(g·h,FW), respectively, for M. aeruginosa and S. quadricauda, which displayed higher ability to utilize bicarbonate in photosynthesis of S. quadricauda. Addition of 0.8mmol/L of AZ (acetazolamide) caused 100% inhibition of PCUBC for M. aeruginosa; PCUBC decreased to 0 when 1.6mmol/L of AZ presented for S. quadricauda. Presence of 1.2 mmol/L DIDS (4,4'-diisothio cyanatostilbene-2,2'-disulfonic acid) inhibited PCUBC by up to 56.10% and 39.74% for M. aeruginosa and S. quadricauda, respectively. These inhibiting results showed that M. aeruginosa was more sensitive to inhibitors than S. quadricauda, and suggested that bicarbonate can be used by these two algae in photosynthesis and that both algae tested are stronger bicarbonate users.
Key words:  Microcystis aeruginosa  Scenedesmus quadricauda  pH drift  net photosynthetic rate  HCO3- uptake rate
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