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学科主题: Multidisciplinary Sciences
题名: Effect of CO2 concentrations on the activity of photosynthetic CO2 fixation and extracelluar carbonic anhydrase in the marine diatom Skeletonema costatum
作者: CHEN Xiongwen & GAO Kunshan
通讯作者: Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Peoples R China
关键词: acetazolamide (AZ) ; carbonic anhydrase ; CO2 affinity ; dissolved inorganic carbon (DIC) ; light ; photosynthesis
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2003
卷: 48, 期:23, 页:2616-2620
收录类别: SCI
部门归属: Shantou Univ, Inst Marine Biol, Shantou 515063, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
摘要: The growth and activity of photosynthetic CO2 uptake and extracellular carbonic anhydrase (CA(ext)) of the marine diatom Skeletonema costatum were investigated while cultured at different levels of CO2 in order to see its physiological response to different CO2 concentrations under either a low (30 mumol . m(-2) . s(-1)) or high (210 mumol . m(-2) . s(-1)) irradiance. The changes in CO2 concentrations (4-31 mumol/L) affected the growth and net photosynthesis to a greater extent under the low than under the high light regime. CAext was detected in the cells grown at 4 mumol/L CO2 but not at 31 and 12 mumol/L CO2, with its activity being about 2.5-fold higher at the high than at the low irradiance. Photosynthetic CO2 affinity (1/K-1/2(CO2)) of the cells decreased with increased CO2 concentrations in culture. The cells cultured under the high-light show significantly higher photosynthetic CO2 affinity than those grown at the low-light level. It is concluded that the regulations of CA(ext) activity and photosynthetic CO2 affinity are dependent not only on CO2 concentration but also on light availability, and that the development of higher CA(ext) activity and CO2 affinity under higher light level could sufficiently support the photosynthetic demand for CO2 even at low level of CO2.
WOS记录号: WOS:000187511000017
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/9588
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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CHEN Xiongwen & GAO Kunshan.Effect of CO2 concentrations on the activity of photosynthetic CO2 fixation and extracelluar carbonic anhydrase in the marine diatom Skeletonema costatum,CHINESE SCIENCE BULLETIN,2003,48(23):2616-2620
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