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Effect of CO2 concentrations on the activity of photosynthetic CO2 fixation and extracelluar carbonic anhydrase in the marine diatom Skeletonema costatum
CHEN Xiongwen & GAO Kunshan; Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Peoples R China
2003
Source PublicationCHINESE SCIENCE BULLETIN
Volume48Issue:23Pages:2616-2620
AbstractThe 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.
KeywordAcetAzolamide (Az) Carbonic Anhydrase Co2 Affinity Dissolved Inorganic Carbon (Dic) Light Photosynthesis
DepartmentShantou Univ, Inst Marine Biol, Shantou 515063, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
Subject AreaMultidisciplinary Sciences
Indexed BySCI
WOS IDWOS:000187511000017
Citation statistics
Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9588
Collection期刊论文
Corresponding AuthorGao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Peoples R China
Recommended Citation
GB/T 7714
CHEN Xiongwen & GAO Kunshan,Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Peoples R China. Effect of CO2 concentrations on the activity of photosynthetic CO2 fixation and extracelluar carbonic anhydrase in the marine diatom Skeletonema costatum[J]. CHINESE SCIENCE BULLETIN,2003,48(23):2616-2620.
APA CHEN Xiongwen & GAO Kunshan,&Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Peoples R China.(2003).Effect of CO2 concentrations on the activity of photosynthetic CO2 fixation and extracelluar carbonic anhydrase in the marine diatom Skeletonema costatum.CHINESE SCIENCE BULLETIN,48(23),2616-2620.
MLA CHEN Xiongwen & GAO Kunshan,et al."Effect of CO2 concentrations on the activity of photosynthetic CO2 fixation and extracelluar carbonic anhydrase in the marine diatom Skeletonema costatum".CHINESE SCIENCE BULLETIN 48.23(2003):2616-2620.
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